Lighting device and method for controlling the same

Abstract

The lighting device can be configured to perform blackbody curve fading. For example, the control circuit can be configured to control the drive circuit such that light emitted by the lighting load is adjusted (e.g., faded) along a blackbody curve. The control circuit can be configured to determine whether to fade from an initial color to an end-point color in a correlated color temperature (CCT) chromaticity space or in an XY chromaticity space. The control circuit can be configured to determine whether the initial color and / or the end-point color is on the blackbody curve. When it is determined that the initial color and the end-point color are on the blackbody curve, the control circuit can be configured to control the drive circuit such that the light emitted by the lighting device is adjusted along the blackbody curve from the initial color to the end-point color.

Description

[0001] Cross-references to related applications

[0002] This application claims priority to U.S. Provisional Patent Application No. 63 / 003,138, filed March 31, 2020, and U.S. Provisional Patent Application No. 63 / 022,095, filed May 8, 2020, the entire contents of which are incorporated herein by reference. Background Technology

[0003] Lamps and displays using high-efficiency lighting devices such as light-emitting diodes (LEDs) are becoming increasingly popular in many different markets. LED lighting devices offer numerous advantages compared to traditional lighting devices such as incandescent and fluorescent lamps. For example, LED lighting devices can have lower power consumption and longer lifespans than traditional lighting devices. Additionally, LED lighting devices may be free of harmful substances and can offer additional specific advantages for different applications. When used for general lighting, LED lighting devices offer the opportunity to adjust the color (e.g., from white to blue, to green, etc.) or color temperature (e.g., from warm white to cool white) of the light emitted from the LED lighting device to produce different lighting effects.

[0004] Multicolor LED lighting devices can have two or more different colored LED emitters (e.g., LED emitters) combined within the same package to produce light (e.g., white or near-white light). Many different types of white LED lighting devices are available on the market, some combining red, green, and blue (RGB) LED emitters; red, green, blue, and yellow (RGBY) LED emitters; phosphor-converted white and red (WR) LED emitters; red, green, blue, and white (RGBW) LED emitters, and so on. By combining different colored LED emitters within the same package and driving the different colored emitters with different drive currents, these multicolor LED lighting devices can produce white or near-white light within a wide color point or correlated color temperature (CCT) range, from warm white (e.g., approximately 2600K to 3700K) to neutral white (e.g., approximately 3700K to 5000K) to cool white (e.g., approximately 5000K to 8300K). Some multicolor LED lighting fixtures can also change the intensity (e.g., luminance and / or brightness) and / or color of the lighting to a specific set point. When set to a specific dimming level and chromaticity setting (e.g., color set point) on a standardized chromaticity diagram, these adjustable lighting fixtures can all produce the same color and color rendering index (CRI). Summary of the Invention

[0005] As described herein, lighting devices (e.g., controllable light-emitting diode (LED) lighting devices) can respond to wireless signals (e.g., radio frequency signals). For example, a lighting device may include wireless communication circuitry configured to transmit wireless messages. A lighting device may include a lighting load (e.g., one or more transmitter modules) configured to emit light. A lighting device may include drive circuitry for controlling the light emitted by the lighting load. A lighting device may include control circuitry configured to control the drive circuitry.

[0006] The lighting device can be configured to perform blackbody curve fading. For example, control circuitry can be configured to control drive circuitry such that light emitted by the lighting load is adjusted (e.g., faded) along a blackbody curve. Drive circuitry can be configured to control the lighting load to emit light having a first color. Control circuitry can be configured to receive a first message indicating a second color via wireless communication circuitry. The first color can be an initial color. The second color can be an endpoint color. The first message can include a fading request (e.g., in an XY chromaticity space). The fading request can include fading information associated with the second color. The second color can be indicated in an XY chromaticity space, a correlated color temperature (CCT) chromaticity space, or another color space. Control circuitry can be configured to determine whether to fade from the first color to the second color in a CCT chromaticity space or an XY chromaticity space.

[0007] The control circuit can be configured to determine whether a first color and / or a second color lies on the blackbody curve. When the first color and / or the second color are within a threshold value from the blackbody curve, it can be determined that the first color and / or the second color lies on the blackbody curve. The threshold value can be a Δuv measurement result. When it is determined that the first color and the second color lie on the blackbody curve, the control circuit can be configured to control the drive circuit such that the light emitted by the illumination device is adjusted along the blackbody curve from the first color to the second color.

[0008] The control circuit can be configured to convert a first color and / or a second color (e.g., from an XY chromaticity space) to a CCT chromaticity space. The conversion can be performed using one or more (e.g., a set) equations and / or lookup tables stored in the memory of the lighting device. The control circuit can be configured to adjust the first color to the second color in the CCT chromaticity space. For example, the control circuit can perform a fade along a blackbody curve between the first and second colors. For example, the control circuit can perform the fade based on a linear relationship between color (e.g., color temperature) and time. Alternatively, the control circuit can perform the fade based on a non-linear relationship between color and time, such that the perceived color change is substantially linear with time. The control circuit can determine multiple CCT values ​​along a blackbody curve between the first and second colors. These multiple CCT values ​​can be associated with a linear or non-linear relationship between color and time. The control circuit can be configured to convert each of the multiple CCT chromaticity values ​​to an XY chromaticity space to determine multiple XY chromaticity coordinates. For example, the control circuit may be configured to convert each of the plurality of CCT chromaticity values ​​into a plurality of uv chromaticity values. The control circuit may then be configured to convert the plurality of uv chromaticity values ​​into the plurality of XY chromaticity coordinates.

[0009] The control circuitry can be configured to control the drive circuitry based on the plurality of XY chromaticity coordinates. For example, the control circuitry can be configured to sequentially send each of the plurality of XY chromaticity coordinates to the drive circuitry at corresponding time instances. The control circuitry can be configured to determine a time schedule (e.g., a time delay between adjacent XY chromaticity coordinates) and send the plurality of XY chromaticity coordinates to the drive circuitry according to the time schedule. The lighting device may include one or more sensors configured to measure the color of light emitted by the lighting device. The control circuitry can be configured to compare the measured color with a second color. If the measured color differs from the second color by more than a predetermined value, the control circuitry can be configured to adjust the control of the lighting load until the measured color is within the predetermined value of the second color.

[0010] A lighting device can be configured to adjust the color of light emitted by the lighting device based on the light level of ambient light near the lighting device. The lighting device can be configured to measure the light level of ambient light near the lighting device and / or a first color temperature. The lighting device can determine whether the first color temperature is less than a red threshold temperature or greater than a blue threshold temperature at the determined light level. If the first color temperature is less than the red threshold temperature at the determined light level, the lighting device can control the lighting load such that the light emitted by the lighting device includes a second color temperature, which is equal to or greater than the red threshold temperature at the determined light level. If the first color temperature is greater than the blue threshold temperature at the determined light level, the lighting device can control the lighting load such that the light emitted by the lighting device includes a third color temperature, which is equal to or less than the blue threshold temperature at the determined light level. The lighting device can be configured to determine a CCT-illuminance profile to use (e.g., one or more values ​​of the CCT-illuminance profile). The lighting device can use the determined CCT-illuminance profile to determine the current color temperature based on the illuminance level of ambient light. The lighting device can control the corresponding intensities of multiple emitters to emit light at the determined current color temperature.

[0011] The lighting device can be configured to use one or more dimming curves to control the lighting load. For example, the lighting device can switch dimming curves at low ambient light levels. The lighting device can be configured to determine the ambient light level near the lighting device. The lighting device can be configured to compare the ambient light level with the predetermined threshold. If the ambient light level is greater than the predetermined threshold, the lighting device can be configured to control the lighting load according to a first dimming curve. If the ambient light level is less than the predetermined threshold, the lighting device can be configured to control the lighting load according to a second dimming curve. Attached Figure Description

[0012] Figure 1 This is a simplified perspective view of an example lighting installation.

[0013] Figure 2 This is an exploded view of another example lighting installation.

[0014] Figure 3 This is a top view of the example transmitter module.

[0015] Figure 4 This is a simplified block diagram of an example lighting device.

[0016] Figure 5A A diagram of the International Commission on Illumination (CIE) 1931 color space depicting the curve of a blackbody is shown.

[0017] Figure 5B An example linear relationship between color temperature and time is depicted, which is used to base on... Figure 5AThe blackbody curve shown is used to adjust the color temperature of the light emitted by the lighting device.

[0018] Figure 5C An example nonlinear relationship between color temperature and time is depicted, which is used to base on... Figure 5A The blackbody curve shown is used to adjust the color temperature of the light emitted by the lighting device.

[0019] Figure 6 It is a description used for based on Figure 5A The flowchart shown is an example control procedure for adjusting the color of light emitted by a lighting device using a blackbody curve.

[0020] Figure 7 It is a graph depicting the illuminance and color temperature of the example color.

[0021] Figure 8A and Figure 8B This is a flowchart depicting an example control procedure for adjusting the color (e.g., color temperature) of light emitted by a lighting device based on the illuminance level (e.g., light level) of ambient light.

[0022] Figure 9 Multiple dimming curves were depicted.

[0023] Figure 10 This is a flowchart depicting an example control procedure used to select a dimming curve. Detailed Implementation

[0024] Figure 1 This is a simplified perspective view of an example lighting device such as lighting device 100 (e.g., a light-emitting diode (LED) lighting device). Lighting device 100 may have a parabolic shape factor and may be a parabolic aluminized reflector (PAR) lamp. Lighting device 100 may include a housing 110 and a lens 112 (e.g., an exit lens) through which light from an internal lighting load (not shown) can be exposed. Lighting device 100 may include a screw-in base 114 that can be configured to screw into a socket to electrically couple lighting device 100 to an alternating current (AC) power source.

[0025] Figure 2 Another example of a lighting device 200 with a parabolic shape factor (e.g., an LED lighting device) (e.g., the lighting device may have a shape factor similar to...) Figure 1An exploded view of the components of the lighting device 100 shown. The lighting device 200 may include an emitter housing 210, which includes a heat sink 212 and a reflector 214 (e.g., a parabolic reflector), and a lens 216 (e.g., an exiting lens). The lighting device 200 may include an illumination load such as an emitter module 220, which may include one or more emitting LEDs. The emitter module 220 may be surrounded by the emitter housing 210 and may be configured to allow light to pass through the lens 216. The lens 216 may be made of any suitable material, such as glass. For example, the lens 216 may be transparent or translucent and may be flat or domed. The reflector 214 may shape the light generated by the emitting LEDs within the emitter module 220 into an output beam. The reflector 214 may include a flat facet 218 (e.g., crescent-shaped) that may provide some randomization of the reflection of the light emitted by the emitter module 220 before it leaves the lighting device 200 through the lens 216. Lens 216 may include an array of small lenses (not shown) formed on both sides of lens 216. Examples of illumination devices having lenses with small lenses are described in more detail in U.S. Patent 9,736,895 entitled “COLOR MIXING OPTICS FORLED ILLUMINATION DEVICE”, issued August 15, 2017, the entire disclosure of which is hereby incorporated by reference.

[0026] The lighting device 200 may include a driver housing 230 configured to house a driver printed circuit board (PCB) 232 on which the circuitry of the lighting device 200 may be mounted. The lighting device 200 may include a screw-in base 234 configured to screw into a receptacle to electrically couple the lighting device 200 to an alternating current (AC) power source. The screw-in base 234 may be attached to the driver housing 230 and may be electrically coupled to the circuitry mounted to the driver PCB 232. The driver PCB 232 may be electrically connected to a transmitter module 220 and may include one or more drive circuitry and / or one or more control circuitry for controlling the amount of power delivered to the transmitter LEDs of the transmitter module 220. The driver PCB 232 and the transmitter module 220 may be thermally connected to a heat sink 212.

[0027] Figure 3 It is configured to be used in lighting devices (e.g., such as...) Figure 1 The lighting device 100 shown or Figure 2The illustration shows a top view of an example emitter module 300 (e.g., emitter module 220 of the lighting device 200) used within the lighting device 200. The emitter module 300 may include an array of emitters 310 (e.g., emitting LEDs) and detectors 312 (e.g., detecting LEDs), mounted on a substrate 314 and encapsulated by a primary optical structure such as a dome 316. For example, the emitter module 300 may include an array of sixteen emitters 310 and four detectors 312. The emitters 310, detectors 312, substrate 314, and dome 316 may form an optical system. The emitters 310 may be arranged in a square array as close as possible to the center of the dome 316 to approximate a central point source. The emitter module 300 may include multiple “chains” (e.g., series-coupled emitters) of the emitters 310. The emitters 310 in each chain may be series-coupled and may conduct the same drive current. Each chain may include emitters 310 that produce illumination at different peak emission wavelengths (e.g., emitting light of the same color). Emitters 310 in different chains can emit light of different colors. For example, emitter module 300 may include four chains of emitters 310 of different colors (e.g., red, green, blue, and white or yellow). An array of emitters 310 may include a chain of four red emitters, a chain of four green emitters, a chain of four blue emitters, and a chain of four white or yellow emitters. The individual emitters 310 in each chain may be distributed around the array and arranged such that no color appears twice in any row, column, or diagonal to improve color mixing within emitter module 300.

[0028] Detector 312 may be placed close to each edge of the array of transmitters 310 and / or placed in the middle of the array of transmitters 310 and may be connected in parallel to a receiver of the illumination device. Similar to transmitter 310, detector 312 may be an LED that can be used to emit or receive optical or electrical signals. When detector 312 is coupled to receive optical signals and emit electrical signals, detector 312 may generate a current indicating incident light from, for example, a single transmitter, multiple transmitters, or a chain of transmitters. Detector 312 may be any device that generates a current indicating incident light, such as a silicon photodiode or LED. For example, detector 312 may each be an LED having a peak emission wavelength in the range of approximately 550 nm to 700 nm, such that detector 312 may respond to infrared light without generating photocurrent (e.g., to reduce interference from ambient light).

[0029] The substrate 314 of the emitter module 300 may be a ceramic substrate formed of aluminum nitride or aluminum oxide material or some other reflective material, and may be used to improve the output efficiency of the emitter module 300 by reflecting light transmitted through the dome 316 out of the emitter module 300. For example, the dome 316 may comprise an optically transmissive material such as silicon or the like, and may be formed by an overmolding process. The surface of the dome 316 may be slightly textured to increase light scattering and promote color mixing, and to reflect a small amount of emitted light back to the detector 312 mounted on the substrate 314 (e.g., about 5%). The size of the dome 316 (e.g., the diameter of the dome in the plane of the emitter 310) may generally depend on the size of the array of emitters 310. The diameter of the dome 316 may be substantially larger than the diameter of the array of emitters 310 (e.g., about 1.5 to 4 times) to prevent total internal reflection.

[0030] Another shape factor of the illumination device can be a linear shape factor. A linear illumination device may include a plurality of emitter modules (e.g., emitter modules 220, 300) spaced apart and arranged linearly (e.g., in a line). Each emitter module in a linear illumination device may include multiple emitters and at least one dedicated detector, all of which can be mounted on a common substrate and encapsulated within a primary optical structure. The primary optical structure may be formed of a variety of different materials and may substantially have any shape and / or size necessary to mix the light emitted by the emitters in any desired manner.

[0031] Figure 4 Such as lighting device 400 (e.g., Figure 1 The lighting device 100 and / or shown Figure 2 The diagram shows a simplified block diagram of an example electrical installation for a lighting device 400. The lighting device 400 may include one or more transmitter modules 410 (e.g., such as...). Figure 2 The transmitter module 220 shown or Figure 3 The transmitter module 300 shown. For example, if the lighting device 400 is a PAR lamp (e.g., as shown in the diagram). Figure 1 and Figure 2 As shown), the lighting device 400 may include a single transmitter module 410. The transmitter module 410 may include one or more transmitters 411, 412, 413, and 414. Each of the transmitters 411, 412, 413, and 414 in... Figure 4The light source is shown as a single LED, but may comprise multiple LEDs connected in series (e.g., an LED chain), multiple LEDs connected in parallel, or suitable combinations thereof, depending on the specific lighting system. Additionally, each of emitters 411, 412, 413, and 414 may include one or more organic light-emitting diodes (OLEDs). For example, the first emitter 411 may represent a red LED chain, the second emitter 412 may represent a blue LED chain, the third emitter 413 may represent a green LED chain, and the fourth emitter 414 may represent a white or amber LED chain. Emitters 411, 412, 413, and 414 may be controlled to adjust the intensity (e.g., illumination intensity or brightness) and / or color (e.g., color temperature) of the cumulative light output of the lighting device 400. Emitter module 410 may also include a photodiode current I that generates a corresponding photodiode current in response to incident light. PD1 I PD2 One or more detectors 416, 418 (e.g., photodiodes, such as red LEDs and green LEDs) (e.g., detector signals).

[0032] The lighting fixture 400 may include a power converter circuit 420 that can receive a voltage such as AC mains voltage V via a thermal connection H and a neutral connection N. AC The source voltage, and across the bus capacitor C BUS Generate DC bus voltage V BUS (For example, approximately 15V to 20V). The power converter circuit 420 may include, for example, a boost converter, buck converter, buck-boost converter, flyback converter, single-ended primary inductor converter (SEPIC), Ćuk converter, or any other suitable power converter circuit for generating the appropriate bus voltage. The power converter circuit 420 may provide electrical isolation between the AC power supply and the transmitters 411, 412, 413, 414, and may operate as a power factor correction (PFC) circuit to adjust the power factor of the lighting fixture 400 toward power factor one.

[0033] The lighting device 400 may include one or more transmitter module interface circuits 430 (e.g., one transmitter module interface circuit for each transmitter module 410 in the lighting device 400). The transmitter module interface circuit 430 may include an LED driver circuit 432 for controlling (e.g., individually controlling) the power supplied to each of the transmitters 411, 412, 413, 414 of the respective transmitter module 410 and the intensity (e.g., illumination intensity and / or luminous flux) of the light emitted by each transmitter. The LED driver circuit 432 may receive a bus voltage V. BUS Furthermore, the corresponding LED driving current I conducted through transmitters 411, 412, 413, and 414 can be adjusted. LED1I LED2 I LED3 I LED4 The value of the LED driving current I. The LED driving circuit 432 may include one or more regulating circuits (e.g., four regulating circuits), such as those for controlling the corresponding LED driving current I. LED1 To I LED4 A switching regulator (e.g., a buck converter) for the magnitude of the LED driver circuitry. An example of the LED driver circuitry 432 is described in more detail in U.S. Patent No. 9,485,813, issued November 1, 2016, entitled “ILLUMINATION DEVICE AND METHOD FOR AVOIDING AN OVER-POWER OR OVER-CURRENTCONDITION IN A POWER CONVERTER,” the entire disclosure of which is hereby incorporated by reference.

[0034] The transmitter module interface circuit 430 may further include a receiver circuit 434, which may be electrically coupled to the detectors 416, 418 of the transmitter module 410 for use in response to the photodiode current I. PD1 I PD2 Generates the corresponding optical feedback signal V FB1 V FB2 The receiver circuit 434 may include a function for transferring the corresponding photodiode current I. PD1 I PD2 Converted into optical feedback signal V FB1 V FB2 One or more transimpedance amplifiers (e.g., two transimpedance amplifiers). For example, the optical feedback signal V. FB1 V FB2 It can have an indicator I for the corresponding photodiode current. PD1 I PD2 The DC value of the quantity.

[0035] The transmitter module interface circuit 430 may further include a transmitter module control circuit 436 for controlling the LED driver circuit 432 to control the intensity of transmitters 411, 412, 413, and 414 of the transmitter module 410. The transmitter module control circuit 436 may include, for example, a microprocessor, microcontroller, programmable logic device (PLD), application-specific integrated circuit (ASIC), field-programmable gate array (FPGA), or any other suitable processing device or controller. The transmitter module control circuit 436 may generate one or more drive signals V for controlling the corresponding adjustment circuits in the LED driver circuit 432. DR1 V DR2 V DR3 V DR4The transmitter module control circuit 436 can receive the optical feedback signal V from the receiver circuit 434. FB1 V FB2 To determine the luminous flux L of the light emitted by emitters 411, 412, 413, and 414. E .

[0036] The transmitter module control circuit 436 can also receive multiple transmitter positive voltage feedback signals V from the LED driver circuit 432. FE1 V FE2 V FE3 V FE4 and multiple detector positive voltage feedback signals V from receiver circuit 434 FD1 V FD2 Transmitter positive voltage feedback signal V FE1 To V FE4 This can represent the magnitude of the positive voltage of the corresponding transmitters 411, 412, 413, and 414, and the magnitude can indicate the temperature T of the corresponding transmitter. E1 T E2 T E3 T E4 If each transmitter 411, 412, 413, 414 includes multiple LEDs connected in series, then the transmitter positive voltage feedback signal V FE1 To V FE4 It can represent the magnitude of the forward voltage across a single LED or the cumulative forward voltage formed by multiple LEDs across a chain (e.g., all LEDs coupled in series in a chain). The detector forward voltage feedback signal V FD1 V FD2 This can represent the magnitude of the positive voltage of the corresponding detectors 416 and 418, and the magnitude can indicate the temperature T of the corresponding detector. D1 T D2 For example, the detector's positive voltage feedback signal V FD1 V FD2 This can be equal to the positive voltage V of the corresponding detectors 416 and 418. FD .

[0037] The lighting device 400 may include a lighting device control circuit 440, which can be connected via a communication bus 442 (e.g., I...). 2The transmitter module control circuit 436 is electrically coupled to each of one or more transmitter module interface circuits 430 via a communication bus 443. The lighting device control circuit 440 may be configured to communicate with the transmitter module control circuit 436 via the communication bus 443 to control transmitters 411, 412, 413, 414, thereby controlling the intensity (e.g., illumination intensity and / or luminance) and / or color (e.g., color temperature) of the cumulative light emitted by the lighting device 400. The lighting device control circuit 440 may include, for example, a microprocessor, microcontroller, programmable logic device (PLD), application-specific integrated circuit (ASIC), field-programmable gate array (FPGA), or any other suitable processing device or controller. The lighting device control circuit 440 may be configured to control the current intensity L of the cumulative light emitted by the lighting device 400. PRES (For example, current brightness) toward target intensity L TRGT (e.g., target brightness) adjustment (e.g., dimming), the adjustment range of which can span the dimming range of the lighting device, for example, at the lower intensity L LE (For example, minimum strength, such as approximately 0.1% to 1.0%) and upper strength L HE (For example, maximum intensity, such as approximately 100%). The lighting control circuit 440 can be configured to set the current color C of the cumulative light emitted by the lighting device 400. PRES Towards target color C TRGT Adjustments (e.g., in an XY chromaticity space, where color can be defined by x and y chromaticity coordinates). The lighting control circuit 440 can be configured to move towards a target color temperature T. TRGT Adjust the current color temperature T of the cumulative light emitted by the lighting device 400. PRES (For example, in a correlated color temperature (CCT) chromaticity space, where color can be defined by color temperature values). The CCT chromaticity space can range between warm white temperatures (e.g., approximately 1400 K) and cool white temperatures (e.g., approximately 10,000 K). For example, the lighting device control circuit 440 can be configured to adjust the current color C of the accumulated light emitted by the lighting device 400 by transmitting the x and y chromaticity coordinates (e.g., in the XY chromaticity space) to the emitter module control circuit 436. PRES Additionally, the lighting control circuit 440 can be configured to control the target color temperature T. TRGT (For example, in the CCT color space) the current color C of the accumulated light emitted by the illumination device 400 is transmitted to the emitter module control circuit 436 to adjust the color C. PRES .

[0038] The lighting device 400 may include a communication circuit 444 coupled to the lighting device control circuit 440. The communication circuit 444 may include one or more wireless communication circuits, such as a radio frequency (RF) transceiver coupled to an antenna for transmitting and / or receiving RF signals. The one or more wireless communication circuits may include an RF transmitter for transmitting RF signals, an RF receiver for receiving RF signals, or an infrared (IR) transmitter and / or receiver for transmitting and / or receiving IR signals. For example, the communication circuit 444 may include: a first wireless communication circuit capable of communicating on a first wireless communication link (e.g., a wireless network communication protocol such as CLEAR CONNECT (e.g., CLEAR CONNECT A and / or CLEAR CONNECT X) and / or THREAD protocol) using a first wireless protocol; and a second wireless communication circuit capable of communicating on a second wireless communication link (e.g., a short-range wireless communication protocol such as Bluetooth and / or Bluetooth Low Energy (BLE) protocol) using a second wireless protocol. Communication circuit 444 can be configured to receive RF signals (e.g., wireless control signals) from one or more remote control devices via a wireless network communication link. The wireless control signals may include messages indicating an endpoint color (e.g., in the XY chromaticity space, CCT chromaticity space, uv chromaticity space, and / or similar spaces). Communication circuit 444 can be configured to receive RF signals (e.g., wireless configuration signals) (e.g., for configuring the operation of lighting device 400) from a computing device (e.g., a computer, cloud server, mobile device such as a smartphone and / or tablet) via a short-range wireless communication link. Additionally, communication circuit 444 can be coupled to the thermal connection H and neutral connection N of lighting device 400 to transmit control signals via electrical wiring using, for example, power line carrier (PLC) communication technology.

[0039] The lighting control circuit 440 can be configured to determine the target intensity L of the lighting device 400 in response to a message (e.g., a digital message) received via the communication circuit 434. TRGT Target color C TRGT and / or target color temperature T TRGT When the lighting control circuit 440 receives the target color temperature T TRGT At that time, the lighting device control circuit 440 can be configured to set the target color temperature T TRGT The target color C is converted from the CCT color space to the XY color space. TRGT (For example, defined by x-chromaticity coordinates and y-chromaticity coordinates). The lighting control circuit 440 can define the target color C. TRGT The x and y chromaticity coordinates are transmitted to the transmitter module control circuit 436.

[0040] The lighting device 400 may include a memory 446 configured to store operating characteristics of the lighting device 400 (e.g., target intensity L). TRGT Target color temperature T TRGT Lower end strength L LE Upper end strength L HE (etc.). The memory can be implemented as an external integrated circuit (IC) or as internal circuitry of the lighting device control circuitry 440. The lighting device 400 may include a power supply 448 that can receive a bus voltage V. BUS And generate power supply voltage V CC To supply power to the lighting control circuit 440 and other low-voltage circuits of the lighting device 400.

[0041] When the lighting device 400 is turned on, the lighting device control circuit 440 can be configured to control the emitter module 410 to emit light substantially all the time. The lighting device control circuit 440 can also be configured to control the emitter module 410 to interrupt normal light emission to measure one or more operating characteristics of the emitter module during periodic measurement intervals. For example, during the measurement interval, the emitter module control circuit 436 can be configured to individually turn on each of the different colored emitters 411, 412, 413, 414 of the emitter module 410 (e.g., simultaneously turning off the other emitters) and use one of two detectors 416, 418 to measure the luminous flux L of the light emitted by the emitters. E For example, the transmitter module control circuit 436 can turn on the first transmitter 411 of the transmitter module 410 (e.g., while turning off the other transmitters 412, 413, 414) and respond to the first optical feedback signal V generated from the first detector 416. FB1 Determine the luminous flux L of the light emitted by the first transmitter 411 E Additionally, the transmitter module control circuit 436 can be configured to drive transmitters 411, 412, 413, 414 and detectors 416, 418 to generate a transmitter positive voltage feedback signal V during the measurement interval. FE1 To V FE4 and detector positive voltage feedback signal V FD1 V FD2 .

[0042] Methods for measuring the operational characteristics of the emitter housing in an illumination device are described in more detail in the following: U.S. Patent 9,332,598, issued May 3, 2016, entitled "Interference-resistant compensation for illumination devices having multiple emitter modules"; U.S. Patent 9,392,660, issued July 12, 2016, entitled "LED illumination device and calibration method for accurately characterizing the emission LEDs and photodetector(s) included within the LED illumination device"; and U.S. Patent 9,392,663, issued July 12, 2016, entitled "Illumination device and method for controlling an illumination device overchanges in drive current and temperature," the entire disclosure of which is hereby incorporated herein by reference.

[0043] Calibration values ​​for various operating characteristics of the lighting device 400 can be stored in memory 446 as part of a calibration process performed during the manufacture of the lighting device 400. Calibration values ​​can be stored for each of the emitters 411, 412, 413, 414 and / or detectors 416, 418 of each emitter module 410. For example, calibration values ​​can be stored for measurements of luminous flux (e.g., in lumens), x-chromaticity coordinates, y-chromaticity coordinates, emitter forward voltage, photodiode current, and detector forward voltage. For example, the luminous flux, x-chromaticity coordinate, and y-chromaticity coordinate measurements can be obtained from emitters 411, 412, 413, 414 using an external calibration tool such as a spectrophotometer. The values ​​of emitter forward voltage, photodiode current, and detector forward voltage can be measured internally within the lighting device 400. The calibration value of each of the transmitters 411, 412, 413, 414 and / or detectors 416, 418 can be measured at a number of different drive currents (e.g., 100%, 30% and 10% of the maximum drive current of each respective transmitter).

[0044] Furthermore, the calibration values ​​of each of the transmitters 411, 412, 413, 414 and / or detectors 416, 418 can be measured at multiple different operating temperatures. The illumination device 400 can operate in an environment controlled for multiple calibration temperatures, and can measure and store values ​​of its operating characteristics. For example, the illumination device 400 can operate at a cold calibration temperature such as room temperature (e.g., approximately 25°C) and a hot calibration temperature (e.g., approximately 85°C). At each temperature, the calibration values ​​of each of the transmitters 411, 412, 413, 414 and / or detectors 416, 418 can be measured at each of multiple drive currents and stored in memory 446.

[0045] After installation, the lighting control circuit 440 of the lighting device 400 can use the calibration values ​​stored in the memory 446 to maintain a constant light output from the transmitter module 410. The lighting control circuit 440 can determine the target intensity L of the lighting device 400 to achieve the desired light output. TRGT and / or target color temperature T TRGT The light flux L emitted from transmitters 411, 412, 413, and 414 E The target value. The lighting control circuit 440 can be based on the luminous flux L emitted from transmitters 411, 412, 413, and 414. E The determined target value is used to determine the corresponding drive current I of transmitters 411, 412, 413, and 414. LED1 To I LED4 The value of the quantity. When the lifespan of the lighting device 400 is zero, the corresponding drive current I of the transmitters 411, 412, 413, and 414 can be adjusted. LED1 To I LED4 The quantity control is the initial quantity value I. LED-INITIAL .

[0046] The light output of transmitter module 410 may decrease as transmitters 411, 412, 413, and 414 age. The lighting control circuit 440 can be configured to control the drive current I of transmitters 411, 412, 413, and 414. DR The value increases to the adjusted value I LED-ADJUSTED To achieve the target strength L TRGT and / or target color temperature T TRGT Luminous flux L EThe target value has been determined. A method for adjusting the transmitter drive current to achieve constant optical output as the transmitter ages is described in more detail in U.S. Patent Application Publication 2015 / 0382422 entitled “ILLUMINATION DEVICE AND AGE COMPENSATION METHOD”, issued December 31, 2015, the entire disclosure of which is hereby incorporated by reference.

[0047] Figure 5A Chart 500 depicts the International Commission on Illumination (CIE) 1931 color space, which describes color space 505 and blackbody curve 510. Color space 505 may represent a two-dimensional space (e.g., XY chromaticity space), where colors can be indicated by x-chromaticity coordinates and y-chromaticity coordinates. Blackbody curve 510 may represent a one-dimensional space (e.g., CCT chromaticity space), where colors can be indicated by color temperature values ​​(e.g., from 1400 K to 10,000 K). Chart 500 depicts example color adjustments between colors on blackbody curve 510 and between colors on and outside blackbody curve 510. Colors within a predetermined threshold of blackbody curve 510 are considered to be on blackbody curve 510. Colors further away from blackbody curve 510 than a predetermined threshold are considered to be outside blackbody curve 510. A predetermined threshold can be determined such that it lies within a McAdam ellipse of blackbody curve 510. The predetermined threshold may be a ΔUV (Duv) value (e.g., a ΔUV value of 0.05). The predetermined threshold can be a function of illuminance. For example, as the illuminance value (e.g., that of a lighting device) decreases, the predetermined threshold can increase.

[0048] Lighting fixtures (e.g., such as) Figure 1 The lighting device 100 shown Figure 2 The lighting device 200 shown Figure 4 The lighting device 400 shown can be controlled to emit light having a first color 520, which may be referred to as the initial color C. INIT The lighting device can receive a message indicating a second color 530, which may be referred to as the endpoint color C. DEST The lighting device can determine whether the first color 520 and / or the second color 530 lie on the blackbody curve 510. For example, as Figure 5AAs shown, the first color 520 may not be on the blackbody curve 510, and the second color 530 may be on the blackbody curve 510. The lighting device may need to convert the second color 530 from the CCT color space to the XY color space (e.g., as described herein). When the first color 520 and / or the second color 530 is not on the blackbody curve 510, the lighting device may determine that light emitted from the lighting device is adjusted from the first color 520 (e.g., linearly adjusted in the XY color space) to the second color 530 (e.g., from the first color 520 to the blackbody curve 510). For example, light emitted by the lighting device may be adjusted from the first color 520 to the second color 530 along a first path 525 (e.g., fade). The first path 525 may be a straight line between the first color 520 and the second color 530.

[0049] Additionally, the lighting device can be controlled to emit light with a third color 540. In this example, the third color 540 can be referred to as the initial color C. INIT The lighting device can receive a message indicating a second color 530, which may be referred to as the endpoint color C. DEST The illumination device can determine the third color 540 and the second color 530 on the blackbody curve 510. The illumination device may need to convert the second color 530 and / or the third color 540 from the CCT color space to the XY color space (e.g., as described herein). When the initial color C INIT (For example, the third color 540) and the endpoint color C DEST When a second color (530) is determined to lie on a blackbody curve 510, the illumination device can determine that the light emitted from the illumination device will be adjusted from a third color 540 to a second color 530 along the blackbody curve 510 (e.g., in the CCT color space). For example, the light emitted by the illumination device can be adjusted along a second path 545 that extends along the blackbody curve 510 from the third color 540 to the second color 530. The second path 545 can be configured to remain within a predetermined threshold of the blackbody curve 510.

[0050] When the initial color C INIT and the endpoint color C DEST When all colors lie on the blackbody curve 510, the lighting device can be configured to adjust (e.g., fade) the light emitted from the lighting device along the blackbody curve 510 (e.g., in the CCT color space) according to the relationship between color (e.g., color temperature) and time. For example, the lighting device can be configured to adjust the color temperature of the light emitted from the lighting device along the blackbody curve 510 according to the linear relationship between color temperature and time. Figure 5BAn example linear relationship 550 between color temperature and time is depicted, which is used to adjust the color temperature of light emitted by a lighting device based on a blackbody curve 510. Figure 5B As shown, color temperature can range from the warm white temperature (CCT) at one end of the linear relationship (550). WW (For example, approximately 1400 K) Adjust to the cool white temperature CCT at the other end. CW (For example, approximately 10,000 K). For example, the lighting device can be configured to periodically update the color temperature of the light emitted by the lighting device in an update cycle (e.g., every half cycle of the AC power supply to which the lighting device is connected). Based on a linear relationship 550 between color temperature and time, the lighting device can be configured to adjust the color temperature by a constant amount (e.g., a step size) in each update cycle. The constant color temperature adjustment amount in each update cycle can be related to causing the light emitted by the lighting device to change from an initial color C... INIT Fade to the final color C DEST This is associated with specific commands. For example, a lighting device can be based on an initial color C. INIT With the endpoint color C DEST The difference between the two values ​​and / or the update cycle determines the amount of color adjustment for each update cycle. For example, if a lighting device initially emits light at a color temperature of 3000 K and receives a command to fade the emitted light to a color temperature of 6000 K within a one-minute fade cycle, the lighting device can linearly adjust the color temperature from 3000 K at time t1 (e.g., zero seconds) to 6000 K at time t2 (e.g., sixty seconds) relative to time, as... Figure 5B As shown.

[0051] When adjusting the color temperature as defined by the linear relationship between color temperature and time 550, the lighting device can convert the color temperature from the CCT color space to the XY color space in each update cycle before controlling the light emitted from the lighting device. Figure 5A As shown, the CCT near the cool white temperature on the blackbody curve 510 CW A color temperature of 10,000 K (for example) is more suitable for use in the XY color space than a color temperature close to the warm white temperature (CCT). WW A color temperature of 1400 K (e.g.) is more compact. In other words, a constant adjustment of the color temperature in the CCT chromaticity space for each update cycle when using a linear relationship of 550 can result in a change in the color temperature in the XY chromaticity space (e.g., a larger step size for colors closer to a warm white temperature and a smaller step size for colors closer to a cool white temperature in the XY chromaticity space). Because the lighting device fades the color temperature by a constant amount in the CCT chromaticity space, the color of the light emitted by the lighting device (e.g., as perceived by the human eye) may transition from a cool white temperature to a warm white temperature more quickly (e.g., the perceived color temperature change may be non-linear with respect to time).

[0052] The lighting device can be configured to adjust (e.g., fade) the light emitted from the lighting device along a blackbody curve 510, for example, based on a non-linear relationship between color (e.g., color temperature) and time, so that the perceived color temperature change is substantially linear with respect to time. Figure 5C An example nonlinear relationship 560 between color temperature and time is depicted, which is used to adjust the color temperature of light emitted by an illumination device based on a blackbody curve 510. For example, the illumination device can be configured to adjust the light emitted from it along the blackbody curve 510 according to the nonlinear relationship 560 between color temperature and time, which can provide higher resolution near a warm white temperature than near a cool white temperature. In other words, the nonlinear relationship 560 can be configured to avoid abrupt changes in perceived color that would be perceptible using a linear relationship 550 during the fading from an initial color temperature at an initial time to a target color temperature at a target time. The nonlinear relationship 560 may include an exponential relationship defined by an exponential curve, a square-law relationship defined by a square-law curve, and / or another nonlinear relationship. Figure 5C As shown, color temperature can range from the warm white temperature (CCT) at one end of the non-linear relationship (560°). WW (For example, approximately 1500 K) Adjust to the cool white temperature CCT at the other end. CW (For example, approximately 10,000 K). Based on the non-linear relationship 560 between color temperature and time, the lighting device can be configured to adjust the color temperature variably in each update cycle. For example, the lighting device can determine the amount of color adjustment for each update cycle based on the non-linear relationship 560 and / or the update cycle. When using the non-linear relationship 550 between color temperature and time, the light emitted by the lighting device is made to change from an initial color C... INIT Fade to the final color C DEST In this case, the lighting fixture can be configured to provide a smaller color temperature variation near a warm white temperature than near a cool white temperature in each update cycle. For example, if the lighting fixture is initially at a color temperature of 3000 K and receives a command to fade to a color temperature of 6000 K within a one-minute fade cycle, the lighting fixture can adjust the color temperature relative to time from 3000 K at time t3 (e.g., zero seconds) to 6000 K at time t4 (e.g., sixty seconds) according to a non-linear relationship 560. Figure 5C As shown. When using the nonlinear relationship 560, the amount of color temperature change adjustment in the CCT chromaticity space for each update cycle can be adjusted so that the resulting adjustment of the color in the XY chromaticity space is approximately constant (e.g., the perceived color temperature change can be approximately linear with respect to time).

[0053] Figure 6 It is used to depict curves based on blackbody curves (e.g., Figure 5AThe flowchart shown is an example control program 600 that adjusts the color of light emitted by a lighting device (shown as a blackbody curve 510). Control program 600 may be executed as part of a control program (e.g., a color control program). Control program 600 may be implemented by one or more devices. For example, control program 600 may be implemented by a lighting device (e.g., such as...) Figure 1 The lighting device 100 shown Figure 2 The lighting device 200 shown Figure 4 The control circuit of the lighting device 400 shown (e.g., Figure 4 The lighting device control circuit 440 shown is used to adjust the color of the light emitted by the lighting device. For example, control program 600 can be executed at 602 by the light being emitted with a first color (e.g., initial color C). INIT The light is emitted by the illumination device.

[0054] Control program 600 may respond at 602 to receiving an indication of a second color different from the first color (e.g., endpoint color C). DEST The message (e.g., a digital message) is executed. The second color may be indicated in an XY chromaticity space, a correlated color temperature (CCT) chromaticity space, a UVW color space, an RGB color space, or another color space (e.g., referencing values ​​in the aforementioned color spaces). When the second color is indicated in an XY chromaticity space, the message may include the x and y chromaticity coordinates indicating the second color. When the second color is indicated in a CCT chromaticity space, the message may include the CCT value of the second color. When the second color is indicated in a UVW color space, the message may include u chromaticity, v chromaticity, and lightness index (e.g., w). When the second color is indicated in a CCT chromaticity space, the message may include the CCT value of the second color. When the second color is indicated in an RGB color space, the message may include the red x and y chromaticity coordinates, red x and y chromaticity coordinates, green x and y chromaticity coordinates, green x and y chromaticity coordinates, blue x and y chromaticity coordinates, and blue y chromaticity coordinates indicating the second color. The message may include a fade request. The fade request may indicate fade information. Fade information may include fade rate, fade duration, adjustment interval and / or adjustment value (e.g., step size, the increase / decrease in color at each adjustment interval).

[0055] At 604, the illumination device can determine whether the first color and / or the second color is on the blackbody curve. The illumination device can determine that a color is on the blackbody curve when it is within a threshold distance from the blackbody curve (e.g., within a McAdam ellipse of the color on the blackbody curve). The threshold may be a ΔUV (Duv) value (e.g., a ΔUV value of 0.05). At 606, when the first and second colors are on the blackbody curve, the illumination device can determine fading in the CCT color space. Furthermore, at 606, the illumination device can determine fading based on the initial color C...INIT The associated CCT chromaticity value is used to set the current CCT chromaticity value. PRES And it can be based on the endpoint color C DEST The associated CCT chromaticity value is used to determine the endpoint CCT chromaticity value. DEST .

[0056] At 610, the illuminator can determine whether it has faded in the CCT chromaticity space. If the illuminator determines at 610 that it has faded in the CCT chromaticity space, then at 612, the illuminator can adjust the color temperature of the light emitted by the illuminator in the CCT chromaticity space (e.g., the current CCT chromaticity value CCT). PRES For example, the control circuitry of the lighting device may be configured to perform a fade (e.g., linear or nonlinear fade) in the CCT chromaticity space at 612. The control circuitry may be configured to control the lighting load such that light emitted by the lighting device will be adjusted from a first color to a second color by performing a fade in the CCT chromaticity space (e.g., according to a linear or nonlinear relationship 550 between color temperature and time 560). The color temperature may be adjusted (e.g., iteratively) based on fade information received in a message. Alternatively, the lighting device may determine the fade information (e.g., for fade) based on one or more factors. One or more factors may include the time of day, the time associated with the second color, a user-configured fade rate, linear relationship 550, nonlinear relationship 560, update cycle, and / or similar factors. At 612, the lighting device may be pre-configured to perform fade using nonlinear relationship 560. At 612, the lighting device may determine to switch from nonlinear relationship 560 to linear relationship 550 for fade.

[0057] In the example, the lighting device may, for example, determine whether to use a linear relationship 550 or a non-linear relationship 560 for fading in the CCT color space based on an estimated perceived color change. For example, the lighting device may determine whether to use a linear relationship 550 or a non-linear relationship 560 such that the color temperature change during fading is substantially linear with respect to time. In the example, the lighting device may use both linear and non-linear relationships 550 to determine the estimated perceived color change between the current color and the target color. The lighting device may select linear or non-linear relationships 560 based on which corresponding estimated perceived color change between the current color and the target color is closer to a linear perceived color change. The lighting device may be configured to select linear relationship 550 when the perceived color temperature change is substantially continuous. For example, the lighting device may be configured to select non-linear relationship 560 when using linear relationship 550 would result in a discontinuous perceived color temperature change. In the example, the lighting device may, for example, determine whether to use linear or non-linear relationships 550 for fading in the CCT color space based on a ΔCCT value (e.g., the difference between the current color temperature and the target color temperature). When ΔCCT is below a threshold difference (e.g., 1000 K), the lighting device may determine to use a linear relationship 550 for fading. For example, when ΔCCT is below the threshold difference, fading using a linear relationship 550 may appear to the user the same as fading using a non-linear relationship 560 (e.g., having the same perceived color change). When ΔCCT is greater than or equal to the threshold difference, the lighting device may determine to use a non-linear relationship 560 for fading.

[0058] As the luminance device fades along a blackbody curve in the CCT chromaticity space, it can determine multiple CCT chromaticity values ​​along the curve between a first color temperature and a second color temperature. These multiple CCT chromaticity values ​​can be associated with fading (e.g., fading information). The numerous CCT chromaticity values ​​during fading (e.g., step size or scale) can be determined based on one or more factors, such as fading duration, the difference between the first and second color temperatures, the relationship between color temperature and time (e.g., linear or non-linear), and / or similar factors. For example, the luminance device can determine the current CCT chromaticity value (CCT) among the multiple CCT chromaticity values ​​along the blackbody curve. PRES The adjustment (e.g., iteratively) is made to the next CCT chromaticity value among a plurality of CCT chromaticity values. The lighting device may repeat cycles 610, 612, 614, 618, and 620 for the remaining CCT chromaticity values ​​until a second color (e.g., the last CCT chromaticity value among the plurality of CCT chromaticity values) is reached. The last CCT chromaticity value among the plurality of CCT chromaticity values ​​may be the second color (e.g., the endpoint color C). DEST The associated CCT chromaticity value.

[0059] At position 612, the lighting device can adjust the current CCT chromaticity value based on fading information. PRES When the lighting device first enters 612, the current CCT chromaticity value is CCT. PRES Equal to the initial color C INIT The associated CCT chromaticity value. When determining how to adjust the current CCT chromaticity value based on fading information... PRES At this time, the lighting device can determine the fade duration (e.g., 3 seconds), adjustment value, fade rate, and / or adjustment interval. The fade duration can be defined from the initial color C. INIT Fade to the final color C DEST The adjustment interval can be the frequency (e.g., time amount or period) at which the lighting fixture periodically adjusts the lighting load over the fade duration. In some examples, the adjustment interval can be set to the length of one line cycle of the AC trunk voltage, thus 16.67 ms when operating in a 60 Hz system, or every 20 ms when operating in a 50 Hz system. The adjustment amount can define the magnitude of the step change (e.g., ΔCCT) for each adjustment interval. The adjustment amount can be based on C INIT C DEST The fade rate is determined by the fade duration and / or adjustment interval. The fade rate can be measured as the speed at which each color adjustment is performed (e.g., the adjustment amount divided by the adjustment interval). At 612, the illuminator can adjust the current CCT chromaticity value CCT along a blackbody curve based on the fade duration and / or adjustment interval. PRES Adjust the adjustment value. Taking a fade duration of 3 seconds and an adjustment interval of 16.67 ms as an example, at position 612, the illumination device can adjust the current CCT chromaticity value. PRES Adjust to equal the current CCT chromaticity value. PRES CCT chromaticity value at endpoint DEST The path changes by approximately 1 / 180 of a step. Furthermore, in this example, the lighting device can execute cycles 610, 612, 614, 618, and 620, and adjust the CCT within 3 seconds. PRES Approximately 180 times, to make the current CCT chromaticity value CCT PRES Equal to the endpoint CCT chromaticity value CCT DEST .

[0060] At position 614, the lighting device can adjust the current CCT chromaticity value determined at position 612. PRES Transform from CCT chromaticity space to XY chromaticity space to determine the current X chromaticity value. PRES And the current Y chromaticity value Y PRES The adjusted current CCT chromaticity value. PRESThe conversion to the XY chromaticity space can be based on one or more (e.g., a set) equations stored in the memory of the lighting device. The adjusted current CCT chromaticity value is CCT. PRES The chromaticity can be converted to the XY chromaticity space based on a lookup table stored in the lighting device's memory. The lighting device can be configured to adjust the current CCT chromaticity value. PRES Convert to the UV color space to determine the current UV color value (e.g., the current U color value U). PRES and the current chromaticity value V PRES Then it is configured to convert the current uv chromaticity value to the current XY chromaticity value.

[0061] At 618, the lighting device can control the drive circuit so that the light emitted by the lighting device is adjusted from a first color to a second color. For example, at 618, the drive circuit can adjust the color based on the current X chromaticity value X. PRES And the current Y chromaticity value Y PRES To control the LED driver circuit. The control circuit can control X PRES and Y PRES Send to the transmitter module control circuit (e.g., such as Figure 4 The transmitter module control circuit 436 shown is used to appropriately drive each of the LEDs (e.g., LEDs of different colors) in the lighting device. When the lighting device determines at 620 that the light emitted by the lighting device is not the second color (e.g., the current CCT chromaticity value CCT...),... PRES Not equal to the endpoint CCT chromaticity value CCT DEST When this happens, control program 600 can return to 610, and the control circuit can adjust the current X chromaticity value X. PRES And the current Y chromaticity value Y PRES Another iteration. The lighting device can continue to iteratively adjust the current chromaticity value X. PRES And the current Y chromaticity value Y PRES until they are equal to the endpoint X chromaticity value X determined at 608. DEST and the endpoint Y chromaticity value Y DEST。 For example, the lighting device can execute cycles 610, 612, 614, 618, and 620 and adjust the current CCT chromaticity value CCT based on the adjustment interval and adjustment amount. PRES Until the current CCT chromaticity value CCT PRES Equal to the endpoint CCT chromaticity value CCT DEST Once the current CCT chromaticity value is CCT PRES Equal to the endpoint CCT chromaticity value CCT DEST The control program 600 can be exited.

[0062] If the lighting device determines at 604 that either the first color or the second color is not on the blackbody curve, then at 608, the lighting device can determine a fading in the XY chromaticity space. For example, the lighting device can determine a fading in the XY chromaticity space when the first color and / or the second color is not on the blackbody curve. In some examples, at 608, the lighting device can determine a fading based on the initial color C. INIT The associated X and Y chromaticity coordinates are used to set the current X chromaticity coordinate. PRES and the current Y chromaticity coordinate Y PRES Furthermore, at point 608, the lighting fixture can be based on the endpoint color C. DEST The associated X and Y chromaticity coordinates determine the endpoint X chromaticity coordinate. DEST and the endpoint Y chromaticity coordinates Y DEST When the lighting device determines a fade in the XY chromaticity space at 610, the lighting device can adjust (e.g., iteratively) the current X chromaticity coordinate X at 616, for example, based on the fade duration, adjustment amount, and adjustment interval. PRES and the current Y chromaticity coordinate Y PRES The lighting device can continue to iteratively adjust the current X chromaticity coordinates. PRES and the current Y chromaticity coordinate Y PRES until they are equal to the endpoint X chromaticity coordinates X determined at 608. DEST and the endpoint Y chromaticity coordinates Y DEST。 For example, in the current X chromaticity coordinate X PRES and the current Y chromaticity coordinate Y PRES Equal to the endpoint X chromaticity coordinate X DEST and the endpoint Y chromaticity coordinates Y DEST When the time comes, control program 600 can be terminated.

[0063] If the lighting fixture is determined to be non-fading in the CCT chromaticity space at 610, then at 616, the lighting fixture can adjust the current X chromaticity coordinate X based on the fading duration and / or adjustment interval. PRES and the current Y chromaticity coordinate Y PRES Adjust the current X chromaticity coordinate at position 616. PRES and the current Y chromaticity coordinate Y PRES Then, the lighting device can be based on the current X chromaticity coordinates X PRES and the current Y chromaticity coordinate Y PRES To control the LED driver circuit.

[0064] Lighting devices may include one or more sensors (e.g., such as...) Figure 3(Detector 312 shown). At least one of one or more sensors may be configured to measure the color of light emitted by the lighting device. Alternatively, an external sensor may measure the color of light emitted by the lighting device. The lighting device may receive indications of the color of light emitted by the lighting device from an external sensor and / or a system controller. At 620, the lighting device may be configured to determine whether the light emitted by the lighting device is a second color (e.g., C). DEST If the light emitted by the lighting device is measured in a second color, then control program 600 can end.

[0065] The lighting device can determine that a first color is outside the blackbody curve (e.g., greater than a threshold distance from the blackbody curve) and a second color is on the blackbody curve. The lighting device can control the drive circuit based on the first color being greater than the threshold distance from the blackbody curve and the second color being on the blackbody curve, such that the light emitted by the lighting device is adjusted (e.g., linearly adjusted) towards the blackbody curve to a third color on the blackbody curve. The lighting device can then control the drive circuit to adjust the light emitted by the lighting device along the blackbody curve between the third color and the second color using control program 600, where the third color is the initial color and the second color is the endpoint color.

[0066] In the example, the lighting device may determine that a first color lies on the blackbody curve and a second color lies outside the blackbody curve. The lighting device may control the drive circuitry such that, using control program 600, the light emitted by the lighting device is adjusted along the blackbody curve between the first color and an intermediate color, where the first color is the initial color and the intermediate color is the endpoint color. The lighting device may then control the drive circuitry such that the light emitted by the lighting device is adjusted (e.g., linearly adjusted) away from the blackbody curve to the second color outside the blackbody curve.

[0067] Figure 7This is an illuminance versus color temperature graph 700 depicting the appearance of example colors. Graph 700 may be a preferred color temperature graph, such as a Kruithof curve, depicting the color temperature of regions generally considered comfortable or pleasing to an observer (e.g., the human eye) at a given illuminance level (e.g., light level). Graph 700 may define a first region 710 where light appears reddish and is unpleasant to the human eye (e.g., the observer). The first region 710 may be defined by a first curve 712. The first curve 712 may be a CCT red boundary defining the corresponding threshold color temperature for various illuminance values ​​below which emitted light appears reddish in color. Graph 700 may define a second region 720 where light appears bluish and is unpleasant to the human eye. The second region 720 may be defined by a second curve 722. The second curve 722 may be a CCT blue boundary defining the corresponding threshold color temperature for various illuminance values ​​above which emitted light appears bluish in color. Chart 700 may define a third region 730 between the first region 710 and the second region 720. The third region 730 may be defined by the first curve 712 and the second curve 722. The third region 730 may define the color temperature of various illuminance values ​​between the first curve 712 and the second curve 722 to make the emitted light pleasing to the human eye.

[0068] Lighting fixtures (e.g., such as) Figure 1 The lighting device 100 shown Figure 2 The lighting device 200 and / or shown Figure 4 The lighting device 400 shown can be configured to control the color temperature of the light emitted from the lighting device to maintain the color temperature in a pleasing range of a preferred color temperature diagram (e.g., Figure 7 The third region 730 of the Koruisov curve is shown. For example, the lighting device can be configured to determine the illuminance level of the space illuminated by the lighting device and compare the determined illuminance level with the CCT red boundary (e.g., the first curve 712) and the CCT blue boundary (e.g., the second curve 714) to keep the color temperature of the light emitted from the lighting device within a pleasing range.

[0069] The values ​​of the CCT red boundary (e.g., first curve 712) and CCT blue boundary (e.g., second curve 714) can be configurable. For example, the values ​​of the CCT red boundary and CCT blue boundary can be configured based on user preferences. Users may be able to configure the values ​​of the CCT red boundary and CCT blue boundary using an application running on a computing device (e.g., a mobile device), and the computing device can transmit the adjusted values ​​of the CCT red boundary and CCT blue boundary to the lighting device. For example, users can select from multiple options displayed by an application running on the computer device (e.g., different options for color temperature preference maps and / or the shape and values ​​of the CCT red boundary and CCT blue boundary). Alternatively, users can utilize a wizard executed by an application running on the computer device to configure the values ​​of the CCT red boundary and CCT blue boundary. Users can configure the values ​​of the CCT red boundary and CCT blue boundary based on user preferences and / or based on the color of the environment (e.g., walls, furniture, etc.) that the lighting device is illuminating. Furthermore, the values ​​of the CCT red boundary and CCT blue boundary can be updated automatically. For example, in response to the detection of a color temperature change in the lighting device, such as when manually adjusted by a user (e.g., in response to activation of a button on a remote control device that controls the lighting device), the lighting device can automatically configure (e.g., learn) the desired values ​​of the CCT red boundary and the CCT blue boundary.

[0070] Additionally, the lighting device can be configured to determine the illuminance level of the space illuminated by the lighting device, and to control the color temperature of the light emitted from the lighting device based on (e.g., according to) the determined illuminance level. For example, the lighting device can be configured to move along, as... Figure 7 The CCT-illuminance curve 740 shown is used to control the color temperature of the light emitted from the lighting device. For illuminance values ​​below the threshold illuminance (e.g., approximately 500 lumens), ... Figure 7 As shown, the value of the CCT-illuminance curve 740 can be set to be equal to the median value between the CCT red boundary and the CCT blue boundary. The value of the CCT-illuminance curve 740 can be stored in the memory of the lighting device. In addition, the value of the CCT-illuminance curve 740 can be configured by the user and / or automatically configured by the lighting device in a manner similar to the configurability of the CCT red boundary and CCT blue boundary values ​​as described above.

[0071] Figure 8A This is a flowchart depicting an example control program 800 for adjusting the color (e.g., color temperature) of light emitted by a lighting device based on the illuminance level (e.g., light level) of the ambient light in the space where the lighting device is installed. The control program 800 may be executed as part of a control program. The control program 800 may be implemented by one or more devices. For example, the control program 800 may be implemented by a control circuit of the lighting device (e.g., such as...). Figure 1The control circuit of the lighting device 100 shown, Figure 2 The control circuit and / or control circuit of the lighting device 200 shown Figure 4 The lighting device 400 shown is controlled by a lighting device control circuit 440, a remote control device control circuit, and / or a system controller control circuit to adjust the color of the light emitted by the lighting device (e.g., the current color temperature CCT). PRES For example, the control circuit may periodically execute control program 800 at 801. Additionally, in response to changes in ambient light illuminance levels and / or changes in the target intensity of the lighting device, the control circuit may execute control program 800 at 801. The control circuit may execute control program 800 to ensure that the light in the space is, for example, pleasant to the user (e.g., in...). Figure 7 (Within region 730 of the chart 700 shown). If the light in the space does not appear too reddish or bluish, then the light can be considered pleasing.

[0072] At 802, the control circuit can determine the illuminance relative to the CCT chart (e.g., Figure 7 The CCT red border (e.g., shown in Figure 700) on the graph Figure 7 The first curve 712 shown) and the blue boundary of CCT (e.g., Figure 7 The values ​​on the second curve 714 shown. For example, the values ​​of the CCT red boundary and the CCT blue boundary can be stored in the memory on the lighting device, and the control circuit can retrieve the values ​​of the CCT red boundary and the CCT blue boundary from the memory at 802. The values ​​of the CCT red boundary and the CCT blue boundary can be fixed values ​​and / or can be configurable values. For example, a user can use a computing device to configure the values ​​of the CCT red boundary and the CCT blue boundary, and the configured values ​​can be transmitted to the lighting device and stored in the memory. In addition, for example, in response to detecting a color temperature change of the lighting device such as that manually adjusted by the user, the control circuit can automatically configure (e.g., learn) the values ​​of the CCT red boundary and the CCT blue boundary.

[0073] At point 804, the control circuit determines the ambient light illuminance level E near the lighting fixture. AMB If ambient light and lighting fixtures are in the same space (e.g., a room), the ambient light is likely near the lighting fixtures. Lighting fixtures may include one or more sensors (e.g., such as...). Figure 3 The detector 312 shown, the one or more sensors are configured to measure the illuminance level E of ambient light. AMB The control circuit can receive the ambient light illuminance level E near the lighting device. AMB The indicator. Ambient light illuminance level E AMBThe indication can be received from one or more sensors. The control circuit can be configured to determine the ambient light illuminance level E in response to the sensors. AMB Alternatively and / or additionally, the ambient light illuminance level E AMB The indication can be received via the wireless communication circuitry of the lighting device (e.g., from an external sensor).

[0074] At position 806, the control device can determine the current color temperature (CCT). PRES (For example, the control circuit controls whether the color temperature of the light emitted by the lighting device is less than a given illuminance level E.) AMB Red threshold temperature (CCT) TH-RED Red threshold temperature (CCT) TH-RED The CCT red threshold temperature can represent the value at the red boundary. The CCT red boundary defines the corresponding threshold color temperature for various illuminance values, below which the emitted light appears reddish. Additionally, the red threshold temperature (CCT)... TH-RED t can deviate from the CCT red boundary (e.g., to provide a buffer between the threshold temperature and the unpleasant region). The unpleasant region can be larger or smaller than the threshold temperature for different users. Figure 7 The area shown. The buffer ensures the red threshold temperature (CCT). TH-RED Keep outside the unpleasant areas of other users (e.g., those with larger unpleasant areas). For example, the red threshold temperature (CCT). TH-RED At a specific illuminance value, the CCT red threshold temperature can be offset by an offset value. This offset value can be configured to make the CCT red threshold temperature... TH-RED Maintaining illuminance levels outside of unpleasant areas for various users and / or relative to ambient light illuminance levels E AMB Even small changes are still pleasing. For example, the red threshold temperature (CCT) TH-RED The value at the CCT red boundary can be added to the offset value (e.g., greater than). Figure 7 The value of the first curve 712 shown is used to determine this.

[0075] If the current color temperature is CCT PRES Less than the defined illuminance level E AMB Red threshold temperature (CCT) TH-RED Then the control circuit can control the lighting load at 808 to adjust the current color temperature (CCT) of the light emitted by the lighting device. PRES Increase to equal to or greater than a defined illuminance level E AMB Red threshold temperature (CCT) TH-RED For example, the control circuit can set the current color temperature (CCT) at 808. PRES Set to a certain illuminance level E AMB Red threshold temperature (CCT) TH-RED Largest first offset CCTOFFSET1 (e.g., CCT) PRES = CCT TH-RED + CCT OFFSET1 The first offset CCT can be determined. OFFSET1 This makes the red threshold temperature (CCT) TH-RED (For example, a color that may appear reddish) and the current color temperature (CCT) PRES There is a buffer between (for example, a potentially pleasing color). For example, the first offset CCT can be determined. OFFSET1 This makes the illuminance level E of the light emitted by the lighting device relative to the ambient light. AMB Even minor changes are pleasing. The control circuit sets the current color temperature (CCT) at 808. PRES Set to be greater than or equal to a defined illuminance level E AMB Red threshold temperature (CCT) TH-RED Subsequently, the control circuit at 814 can control the drive circuit (e.g., LED driver circuit 432) to control the emitters (e.g., emitters 411, 412, 413, 414) to the appropriate intensity so that the lighting device is at the current color temperature (CCT). PRES (For example, as determined at 808) emit light. Then, control program 800 can end at 816.

[0076] If the current color temperature is CCT PRES Not less than the specified illuminance level E AMB Red threshold temperature (CCT) TH-RED Then the control circuit can determine the current color temperature (CCT) at 810. PRES Is it greater than the defined illuminance level E? AMB Blue threshold temperature CCT TH-BLUE Blue threshold temperature (CCT) TH-BLUE It can represent illuminance and CCT charts (e.g., Figure 7 The blue border of the CCT on the chart shown in Figure 700 (e.g., Figure 7 The values ​​on the second curve (722) shown. The CCT blue boundary defines the corresponding threshold temperature for various illuminance values ​​above which the emitted light appears bluish. Additionally, the blue threshold temperature CCT... TH-BLUE It can deviate from the CCT blue boundary (e.g., to provide a buffer between the threshold temperature and the unpleasant region). The unpleasant region can be larger or smaller than the threshold temperature for different users. Figure 7 The area shown. The buffer ensures the blue threshold temperature (CCT). TH-BLUE Keep it outside the unpleasant areas of other users (e.g., those with larger unpleasant areas). For example, the blue threshold temperature (CCT). TH-BLUEAt a specific illuminance value, the blue threshold temperature (CCT) can be offset by an offset value. This offset value can be configured to make the blue threshold temperature (CCT) of the CCT... TH-BLUE Maintaining illuminance levels outside of unpleasant areas for various users and / or relative to ambient light illuminance levels E AMB Even minor changes are still pleasing. Blue threshold temperature (CCT) TH-BLUE The offset value can be compared with the red threshold temperature CCT. TH-RED The offset values ​​are the same. Blue threshold temperature CCT TH-BLUE This can represent the value on the blue boundary of the CCT minus the offset value (e.g., less than). Figure 7 The value of the second curve 722 shown).

[0077] If the current color temperature is CCT PRES Greater than the determined illuminance level E AMB Blue threshold temperature CCT TH-BLUE Then the lighting device can control the lighting load at 812 to make the current color temperature (CCT) of the light emitted by the lighting device... PRES Reduce to equal to or less than a defined illuminance level E AMB Blue threshold temperature CCT TH-BLUE For example, the control circuit can set the current color temperature (CCT) at 812. PRES Set to a certain illuminance level E AMB Blue threshold temperature CCT TH-BLUE Small second offset CCT OFFSET2 (e.g., CCT) PRES =CCT TH-BLUE -CCT OFFSET2 The second offset CCT can be determined. OFFSET2 This makes the blue threshold temperature (CCT) TH-BLUE (For example, a color that may appear reddish) and the current color temperature (CCT) PRES There is a buffer between (for example, a potentially pleasing color). For example, the second offset CCT can be determined. OFFSET2 This makes the illuminance level E of the light emitted by the lighting device relative to the ambient light. AMB Even minor changes are pleasing. The control circuit sets the current color temperature (CCT) at 808. PRES Set to less than or equal to a defined illuminance level E AMB Blue threshold temperature CCT TH-BLUE Subsequently, the control circuit at 814 can control the drive circuit (e.g., LED driver circuit 432) to control the emitters (e.g., emitters 411, 412, 413, 414) to the appropriate intensity so that the lighting device is at the current color temperature (CCT). PRES (For example, as determined at 808) it emits light. Then, control program 800 can end at 816.

[0078] If the current color temperature (CCT) is determined at 810... PRES Less than the defined illuminance level E AMB Blue threshold temperature CCT TH-BLUE Then, control procedure 800 can end at 816. The control circuit can be configured to use one or more sensors to perform periodic measurements of the illuminance level of ambient light near the lighting fixture. The control circuit can determine that the illuminance level of ambient light near the lighting fixture has changed from a first illuminance level to a second illuminance level. The control circuit can repeat control procedure 800 for the second illuminance level. For example, the control circuit can determine whether the change from the first illuminance level to the second illuminance level is greater than a predetermined threshold. When the difference between the second illuminance level and the first illuminance level is greater than the predetermined threshold, the lighting fixture can repeat control procedure 800 for the second illuminance level to control the lighting load such that the current color temperature (CCT) is maintained. PRES The light emitted by the lighting device lies between the CCT red boundary and the CCT blue boundary at the second illuminance level. Alternatively and / or additionally, the control circuit may receive a message indicating that the illuminance level change is greater than a predetermined threshold via a wireless communication circuit.

[0079] Figure 8B This is a flowchart depicting an example control program 850 for adjusting the color of light emitted by a lighting device based on the illuminance level (e.g., light level) of the ambient light where the lighting device is installed. The control program 850 may be executed as part of a control procedure. The control program 850 may be implemented by one or more devices. For example, the control program 850 may be implemented by the control circuitry of the lighting device (e.g., such as...). Figure 1 The control circuit of the lighting device 100 shown, Figure 2 The control circuit and / or control circuit of the lighting device 200 shown Figure 4 The lighting device 400 shown is controlled by a lighting device control circuit 440, a remote control device control circuit, and / or a system controller control circuit to adjust the color of the light emitted by the lighting device (e.g., the current color temperature CCT). PRES For example, the control circuit may periodically execute control program 850 at 851. Additionally, in response to changes in ambient light illuminance levels and / or changes in the target intensity of the lighting device, the control circuit may execute control program 800 at 851. The control circuit may execute control program 800 to ensure that the light in the space is pleasant (e.g., in...). Figure 7 (Within region 730 of the chart 700 shown). If the light in the space does not appear too reddish or bluish, then the light can be considered pleasing.

[0080] At 852, the control circuit can determine the CCT-illuminance curve (e.g., Figure 7The value of the CCT-illuminance curve (740) shown. For example, the value of the CCT-illuminance curve may be stored in a memory on the lighting device, and the control circuit may retrieve the value of the CCT-illuminance curve from the memory at 852. The value of the CCT-illuminance curve may be a fixed value and / or a configurable value. For example, a user may use a computing device to configure the value of the CCT-illuminance curve, and the configured value may be transmitted to the lighting device and stored in the memory. In the example, the control circuit may determine (e.g., select) a CCT-illuminance curve from a plurality of CCT-illuminance curves stored in the memory. Additionally, for example, in response to detecting a color temperature change of the lighting device, such as a manual adjustment by the user, the control circuit may automatically configure (e.g., learn) the value of the CCT-illuminance curve. For example, the lighting device may recognize a manual adjustment of the color temperature by the user. The lighting device may be configured to store a plurality of previous user adjustments in the memory. The CCT-illuminance curve may be adjusted (e.g., learned) based on the plurality of previous user adjustments.

[0081] At point 854, the control circuit determines the ambient light illuminance level E near the lighting fixture. AMB If ambient light and lighting fixtures are in the same space (e.g., a room), the ambient light is likely near the lighting fixtures. Lighting fixtures may include one or more sensors (e.g., such as...). Figure 3 The detector 312 shown, the one or more sensors are configured to measure the illuminance level E of ambient light. AMB The control circuit can receive the ambient light illuminance level E near the lighting device. AMB The indicator. Ambient light illuminance level E AMB The indication can be received from one or more sensors. The control circuit can be configured to determine the ambient light illuminance level E in response to the sensors. AMB Alternatively and / or additionally, the ambient light illuminance level E AMB The indication can be received via the wireless communication circuitry of the lighting device (e.g., from an external sensor).

[0082] At 856, the control circuit can be based on the CCT-illuminance curve (e.g., as determined at 852) and the illuminance level E. AMB (For example, as determined at 854) to set the current color temperature CCT PRES For example, the control circuit can adjust the current color temperature (CCT). PRES Set to equal illuminance level E AMB The CCT-illuminance curve value is set at 856 in the control circuit. PRESSubsequently, the control circuit can control the drive circuit (e.g., LED driver circuit 432) at 858 to control the emitters (e.g., emitters 411, 412, 413, 414) to the appropriate intensity so that the lighting device is at the current color temperature (CCT). PRES (For example, as determined in 856) it emits light. Then control program 850 can end at 860.

[0083] Figure 9 This is a graph 900 depicting multiple dimming curves. Graph 900 includes a linear dimming curve 910, a square-law dimming curve 920, and an exponential dimming curve 930. Lighting fixtures (e.g., such as...) Figure 1 The lighting device 100 shown Figure 2 The lighting device 200 and / or shown Figure 4 The lighting device 400 shown can determine the use of one or more dimming profiles. The dimming profile of the lighting device can be customized relative to the controlled intensity (e.g., determined based on a message received via communication circuit 434) to specify a value for the actual intensity (e.g., the current intensity L). PRES and / or target intensity L TRGT In the example, the lighting device may use a linear dimming curve 910, a square-law dimming curve 920, and / or an exponential dimming curve 930 across the entire intensity range. For example, the lighting device may use one of the dimming curves based on the illuminance level (e.g., light level) of the ambient light where the lighting device is installed. In the example, the lighting device may use a first dimming curve over a first range of ambient light illuminance levels and a second dimming curve over a second range of ambient light illuminance levels. For example, the lighting device may use a square-law curve 920 over the first range of illuminance levels and either a linear dimming curve 910 or an exponential dimming curve 930 over the second range of illuminance levels.

[0084] Figure 10 This is a flowchart depicting an example control procedure 1000 for selecting a dimming curve based on the illuminance level (e.g., light level) of the ambient light where the lighting fixture is installed. Method 1000 may be executed as part of a control procedure (e.g., an intensity control procedure). Control procedure 1000 may be implemented by one or more devices. For example, control procedure 1000 may be implemented by a control circuit of the lighting fixture (e.g., such as...). Figure 1 The control circuit of the lighting device 100 shown, Figure 2 The control circuit of the lighting device 200 shown or Figure 4The control program 1000 is executed by the lighting device control circuit 440 of the lighting device 400, the control circuit of the remote control device, and / or the control circuit of the system controller to determine a dimming curve for controlling the intensity of the light emitted by the lighting device. The control program 1000 can be used to control the intensity of the light emitted by the lighting device by controlling the driving circuit of the lighting device (e.g., LED driving circuit 432) to control the emitters (e.g., emitters 411, 412, 413, 414). For example, the control circuit can periodically execute the control program 1000 at 1002. Additionally, in response to changes in the ambient light illuminance level, the control circuit can execute the control program 1000 at 1002.

[0085] Control program 1000 can be executed to use a dimming profile with finer granularity under low ambient light levels. For example, when the ambient light level is high (e.g., when the ambient light level is greater than the illuminance threshold E). TH (At times), the control circuit can be configured to use a normal dimming curve (e.g., a linear dimming curve 910 and / or Figure 9 The square-law dimming curve 920 shown provides a substantially constant variation in the actual intensity of the lighting device based on a step change in controlled intensity. When the ambient light level is low, the control circuit can be configured, for example, to use a low-level dimming curve (e.g., exponential dimming curve 930) to adjust the dimming based on the low-end intensity L. LE A step change in controlled intensity nearby provides higher granularity in adjusting the actual brightness of the lighting fixture. The control circuitry can use hysteresis when determining which dimming profile to use. For example, when the lighting fixture is using a normal dimming profile, hysteresis can be used when the ambient light level is below a first illuminance threshold E. TH1 When this occurs, the control circuit can begin using (e.g., switch to) a low-level dimming curve. Additionally, when the lighting fixture is using a low-level dimming curve, if the ambient light level is greater than the second illuminance threshold E... TH2 (For example, the second illuminance threshold may be greater than the first illuminance threshold E) TH1 When this occurs, the control circuit can begin using (e.g., switching to) the normal dimming curve.

[0086] At point 1004, the illuminance level E of the ambient light near the lighting fixture is controlled. AMB If ambient light and lighting fixtures are in the same space (e.g., a room), the ambient light is likely near the lighting fixtures. Lighting fixtures may include one or more sensors (e.g., such as...). Figure 3 The detector 312 shown, the one or more sensors are configured to measure the illuminance level E of ambient light. AMB The control circuit can receive the ambient light illuminance level E near the lighting device. AMB The indicator. Ambient light illuminance level E AMBThe indication can be received from one or more sensors. The control circuit can be configured to determine the ambient light illuminance level E in response to the sensors. AMB Alternatively and / or additionally, the ambient light illuminance level E AMB The indication can be received via the wireless communication circuitry of the lighting device (e.g., from an external sensor).

[0087] When the lighting fixture uses a normal dimming curve (e.g., a square-law dimming curve) at point 1006, the lighting fixture can set a specific illuminance level E of the ambient light at point 1008. AMB With the first illuminance threshold E TH1 Comparison. First predetermined illuminance threshold E TH1 This corresponds to a low level of ambient light. For example, a lighting device can determine the ambient light illuminance level E. AMB Is it less than or equal to the first illuminance threshold E? TH1 If the ambient light illuminance level is less than the first illuminance threshold E TH1 Then, at 1008, the control circuit can determine the lighting load of the lighting device according to a low-level dimming curve, such as the exponential dimming curve at 1010 (e.g., Figure 9 The exponential dimming curve shown is 930. Compared to normal dimming curves such as square-law dimming curves, exponential-law dimming curves allow for finer-grained dimming at low illuminance levels below ambient light. For example, control circuitry at 1010 can control the lighting device to gradually increase its intensity from a predetermined illuminance level E of ambient light over a period of time (e.g., from 1 minute to 60 minutes). AMB The initial intensity (e.g., according to a normal dimming curve) is adjusted (e.g., faded) to the determined illuminance level E of the ambient light. AMB The second intensity is set (e.g., according to the low-light dimming curve) so that the intensity change is not noticed by the user.

[0088] When the lighting fixture does not use a normal dimming curve at 1006 (e.g., the lighting fixture uses an exponential dimming curve), the lighting fixture can adjust the ambient light at a predetermined illuminance level E at 1012. AMB With the second illuminance threshold E TH2 Comparison. Second predetermined illuminance threshold E TH2 This corresponds to a high illuminance level of ambient light. If the illuminance level of ambient light E... AMB Greater than or equal to the second illuminance threshold E TH2 The control circuit can then determine at 1014 the dimming curve based on a square-law dimming curve such as at 1014 (e.g., such as...). Figure 9The normal law dimming curve (shown in square law dimming curve 920) is used to control the lighting load. For example, the control circuit at 1013 can control the lighting device to reduce the intensity from the determined illuminance level E of the ambient light over a period of time (e.g., from 1 minute to 60 minutes). AMB The initial intensity (e.g., according to a low-light dimming profile) is adjusted (e.g., faded) to the determined illuminance level E of the ambient light. AMB The second intensity (e.g., according to a normal dimming curve) is such that the intensity change is not noticeable to the user.

[0089] The control circuit can be configured based on the intensity step size and the ambient light illuminance level E near the lighting device. AMB This is used to control the lighting load. For example, the intensity of the lighting load can be adjusted when the user presses a button. Each button press corresponds to a step change in intensity. The control circuit can be configured so that the illuminance level of ambient light near the lighting fixture is below a third illuminance threshold E. TH3 The lighting load is controlled at 1014 based on the normal law dimming curve. The third illuminance threshold E... TH3 This can be a step change threshold. When the illuminance level of the ambient light near the lighting fixture is greater than or equal to the third illuminance threshold E... TH3 In this case, the control circuit can be configured to control the lighting load at 1010 according to an exponential law dimming curve. As described herein, compared to normal dimming curves such as square law dimming curves, exponential law dimming curves can achieve a third illuminance level E below ambient light. TH3 Finer granularity of dimming. For example, when compared to exponential dimming curves, using a normal dimming curve to control the lighting load at low ambient light levels allows the control circuitry to adjust the current intensity to the target intensity with fewer button presses. In other words, compared to exponential dimming curves, normal dimming curves can achieve larger intensity steps for each button press.

[0090] It should be understood that, although Figure 1 and Figure 2 Example lighting devices 100 and 200 are depicted; however, the disclosure herein is not limited to these example lighting devices 100 and 200. Rather, the lighting device referred to herein can be any lighting device, such as a linear lighting device, a strip light, a light bulb, a downlight, a tube, and / or the like.

Claims

1. A lighting device comprising: A wireless communication circuit configured to transmit wireless messages; Lighting load; A driving circuit is used to control the lighting load to emit light having a first color; as well as Control circuit, the control circuit being configured to: Receive a first message indicating a second color via the wireless communication circuit; Determine whether the first color and the second color lie on the blackbody curve; When the first color and the second color are on the blackbody curve, the driving circuit is controlled to iteratively adjust the color of the light emitted by the lighting load along the blackbody curve in the correlated color temperature (CCT) chromaticity space from the first color to multiple CCT chromaticity values ​​until the second color. as well as When one or more of the first color or the second color are not on the blackbody curve, the driving circuit is controlled to periodically update the color of the light emitted by the lighting load in the XY chromaticity space from the first color to the second color.

2. The lighting device of claim 1, wherein the lighting load comprises a plurality of light-emitting diodes (LEDs), and wherein the control circuit is configured to determine a target value of luminous flux to be emitted from each of the plurality of LEDs, such that the light emitted by the lighting device is adjusted from the first color to the second color.

3. The lighting device of claim 1, wherein the second color is indicated in the XY chromaticity space.

4. The lighting device of claim 3, wherein the first message includes x-chromaticity coordinates and y-chromaticity coordinates indicating the second color.

5. The lighting device of claim 1, wherein the second color is indicated in the CCT color space.

6. The lighting device of claim 1, wherein the blackbody curve includes a threshold distance from the blackbody curve.

7. The lighting device of claim 6, wherein the threshold is a Δuv measurement result.

8. The lighting device of claim 6, wherein the control circuit is further configured to: Determine that the first color is greater than the threshold value from the blackbody curve and the second color is on the blackbody curve; and Based on the determination that the first color is greater than the threshold distance from the blackbody curve and the second color is on the blackbody curve, the driving circuit is controlled such that the light emitted by the lighting device is linearly adjusted to the second color.

9. The lighting device of claim 1, wherein the first color is a first color temperature in the CCT color space, and the second color is a second color temperature in the CCT color space.

10. The lighting device of claim 9, wherein the second color temperature is converted from the XY color space to the CCT color space based on a set of equations stored in the memory of the lighting device.

11. The lighting device of claim 9, wherein the second color temperature is converted from the XY color space to the CCT color space based on a lookup table stored in the memory of the lighting device.

12. The lighting device of claim 9, wherein the control circuit is configured to perform a fade in the CCT color space according to the relationship between color temperature and time to control the lighting load such that the light emitted by the lighting device is adjusted from the first color temperature to the second color temperature along the blackbody curve.

13. The lighting device of claim 12, wherein the relationship is a linear relationship between color temperature and time.

14. The lighting device of claim 12, wherein the relationship is a non-linear relationship between color temperature and time, providing higher resolution relative to time when closer to a warm white temperature than when closer to a cool white temperature.

15. The lighting device of claim 12, wherein the control circuit is configured to determine a plurality of CCT chromaticity values ​​along the blackbody curve between the first color temperature and the second color temperature, and wherein the plurality of CCT chromaticity values ​​are associated with the relationship between color temperature and time.

16. The lighting device of claim 12, wherein the control circuit is configured to determine whether the relationship is a linear or nonlinear relationship between color temperature and time based on an estimated perceived color change.

17. The lighting device of claim 16, wherein the control circuit is configured to determine that the relationship is the nonlinear relationship when using the linear relationship would result in a discontinuous perceived change in color temperature.

18. The lighting device of claim 15, wherein the control circuit is configured to convert the plurality of CCT chromaticity values ​​into the XY chromaticity space to determine a plurality of XY chromaticity coordinates.

19. The lighting device of claim 18, wherein the control circuit is configured to: The plurality of CCT chromaticity values ​​are converted into a plurality of UV chromaticity values; and The plurality of UV chromaticity values ​​are converted into the plurality of XY chromaticity coordinates.

20. The lighting device of claim 18, wherein the control circuit is configured to control the drive circuit based on the plurality of XY chromaticity coordinates.

21. The lighting device of claim 20, wherein the control circuit is configured to sequentially send each of the plurality of XY chromaticity coordinates to the drive circuit at corresponding time instances to control the drive circuit such that the light emitted by the lighting device is adjusted from the first color temperature to the second color temperature along the blackbody curve.

22. The lighting device of claim 21, wherein the control circuit is configured to: Determine the timeline associated with the second color temperature; and According to the aforementioned schedule, the plurality of XY chromaticity coordinates are sent to the driving circuit.

23. The lighting device of claim 22, wherein the control circuit is configured to: Determine the time delay between each of the plurality of XY chromaticity coordinates; and Based on the determined time delay, the plurality of XY chromaticity coordinates are sent to the driving circuit.

24. The lighting device of claim 1, further comprising one or more sensors configured to measure the color of the light emitted by the lighting load.

25. The lighting device of claim 24, wherein the control circuit is configured to: The measured color of the lighting device is compared with the second color; and When the measured color differs from the second color by more than a predetermined value, the control of the lighting load is adjusted until the measured color is within the predetermined value of the second color.

26. The lighting device of claim 1, wherein the first message includes a fade request in the XY chromaticity space.

27. The lighting device of claim 26, wherein the fading request includes fading information associated with the second color.

28. The lighting device of claim 1, wherein the first color is an initial color and the second color is an end color.

29. The lighting device of claim 1, wherein the control circuit is configured to determine whether to fade from the first color to the second color in the CCT color space or in the XY color space.

30. The lighting device of claim 1, wherein the control circuit is further configured to: Determine the illuminance level of the lighting load; and Determine whether the second color is below the red threshold temperature or above the blue threshold temperature at the determined illuminance level.

31. The lighting device of claim 30, wherein the control circuit is further configured to control the lighting load such that the light emitted by the lighting device includes a third color, the third color being equal to or greater than the red threshold temperature at the determined illuminance level, when the second color is less than the red threshold temperature at the determined illuminance level.

32. The lighting device of claim 30, wherein the control circuit is further configured to control the lighting load such that the light emitted by the lighting device includes a third color, the third color being equal to or less than the blue threshold temperature at the determined illuminance level, when the second color is greater than the blue threshold temperature at the determined illuminance level.

33. The lighting device of claim 1, wherein the control circuit is further configured to: Determine the ambient light level near the lighting device; The ambient light level is compared with a predetermined threshold. When the ambient light level exceeds a predetermined threshold, the lighting load is controlled according to a first dimming curve; and When the ambient light level is less than a predetermined threshold, the lighting load is controlled according to the second dimming curve.

34. A lighting device comprising: A wireless communication circuit configured to transmit wireless messages; Lighting load; A driving circuit is used to control the lighting load to emit light having a first color; as well as Control circuit, the control circuit being configured to: Receive a first message indicating a second color via the wireless communication circuit; Determine whether the first color and the second color lie on the blackbody curve; and In response to determining that the first color and the second color lie on the blackbody curve, the driving circuit is controlled to fade the light emitted by the illumination load along the blackbody curve from the first color to multiple CCT chromaticity values, up to the second color, within the correlated color temperature (CCT) chromaticity space; and In response to determining that one or more of the first color or the second color are not on the blackbody curve, the driving circuit is controlled to fade the light emitted by the lighting load from the first color to the second color in the XY color space.

35. The lighting device of claim 34, wherein the lighting load comprises a plurality of light-emitting diodes (LEDs), and wherein the control circuit is configured to determine a target value of the luminous flux to be emitted from each of the plurality of LEDs in a discrete time instance when controlling the driving circuit such that the light emitted by the lighting device is adjusted from the first color to the second color along the blackbody curve.

36. The lighting device of claim 34, wherein the second color is indicated in the XY chromaticity space.

37. The lighting device of claim 36, wherein the first message includes x-chromaticity coordinates and y-chromaticity coordinates indicating the second color.

38. The lighting device of claim 34, wherein the second color is indicated in the CCT color space.

39. The lighting device of claim 34, wherein the blackbody curve includes a threshold distance from the blackbody curve.

40. The lighting device of claim 39, wherein the threshold is a Δuv measurement result.

41. The lighting device of claim 39, wherein the control circuit is further configured to: Determine that the first color is greater than the threshold value from the blackbody curve and the second color is on the blackbody curve; and Based on the determination that the first color is greater than the threshold distance from the blackbody curve and the second color is on the blackbody curve, the driving circuit is controlled such that the light emitted by the lighting device is linearly adjusted to the second color.

42. The lighting device of claim 34, wherein the first color is a first color temperature in the CCT color space, and the second color is a second color temperature in the CCT color space.

43. The lighting device of claim 42, wherein the second color temperature is converted from the XY color space to the CCT color space based on a set of equations stored in the memory of the lighting device.

44. The lighting device of claim 42, wherein the second color temperature is converted from the XY color space to the CCT color space based on a lookup table stored in the memory of the lighting device.

45. The lighting device of claim 42, wherein the control circuit is configured to perform the fade in the CCT color space according to the relationship between color temperature and time to control the lighting load such that the light emitted by the lighting load is adjusted from the first color temperature to the second color temperature along the blackbody curve.

46. ​​The lighting device of claim 45, wherein the relationship is a linear relationship between color temperature and time.

47. The lighting device of claim 45, wherein the relationship is a non-linear relationship between color temperature and time, providing higher resolution relative to time when closer to a warm white temperature than when closer to a cool white temperature.

48. The lighting device of claim 45, wherein the control circuit is configured to determine a plurality of CCT chromaticity values ​​along the blackbody curve between the first color temperature and the second color temperature, and wherein the plurality of CCT chromaticity values ​​are associated with the relationship between color temperature and time.

49. The lighting device of claim 45, wherein the control circuit is configured to determine whether the relationship is a linear or nonlinear relationship between color temperature and time based on an estimated perceived color change.

50. The lighting device of claim 49, wherein the control circuit is configured to determine that the relationship is the nonlinear relationship when using the linear relationship would result in a discontinuous perceived change in color temperature.

51. The lighting device of claim 48, wherein the control circuit is configured to convert the plurality of CCT chromaticity values ​​into the XY chromaticity space to determine a plurality of XY chromaticity coordinates.

52. The lighting device of claim 51, wherein the control circuit is configured to: The plurality of CCT chromaticity values ​​are converted into a plurality of UV chromaticity values; and The plurality of UV chromaticity values ​​are converted into the plurality of XY chromaticity coordinates.

53. The lighting device of claim 51, wherein the control circuit is configured to control the drive circuit based on the plurality of XY chromaticity coordinates.

54. The lighting device of claim 53, wherein the control circuit is configured to sequentially send each of the plurality of XY chromaticity coordinates to the drive circuit at corresponding time instances to control the drive circuit such that the light emitted by the lighting device is adjusted from the first color temperature to the second color temperature along the blackbody curve.

55. The lighting device of claim 54, wherein the control circuit is configured to: Determine the timeline associated with the second color temperature; and According to the aforementioned schedule, the plurality of XY chromaticity coordinates are sent to the driving circuit.

56. The lighting device of claim 55, wherein the control circuit is configured to: Determine the time delay between each of the plurality of XY chromaticity coordinates; and Based on the determined time delay, the plurality of XY chromaticity coordinates are sent to the driving circuit.

57. The lighting device of claim 34, further comprising one or more sensors configured to measure the color of the light emitted by the lighting load.

58. The lighting device of claim 57, wherein the control circuit is configured to: The measured color of the lighting device is compared with the second color; and When the measured color differs from the second color by more than a predetermined value, the control of the lighting load is adjusted until the measured color is within the predetermined value of the second color.

59. The lighting device of claim 34, wherein the first message includes a fade request in the XY chromaticity space.

60. The lighting device of claim 59, wherein the fading request includes fading information associated with the second color.

61. The lighting device of claim 34, wherein the first color is an initial color and the second color is an end color.

62. The lighting device of claim 34, wherein the control circuitry is configured to determine whether to fade from the first color to the second color in the CCT color space or in the XY color space.

63. The lighting device of claim 34, wherein the control circuit is further configured to: Determine the illuminance level of the lighting load; and Determine whether the second color is below the red threshold temperature or above the blue threshold temperature at the determined illuminance level.

64. The lighting device of claim 63, wherein the control circuit is further configured to control the lighting load such that the light emitted by the lighting device includes a third color, the third color being equal to or greater than the red threshold temperature at the determined illuminance level, when the second color is less than the red threshold temperature at the determined illuminance level.

65. The lighting device of claim 63, wherein the control circuit is further configured to control the lighting load such that the light emitted by the lighting device includes a third color, the third color being equal to or less than the blue threshold temperature at the determined illuminance level, when the second color is greater than the blue threshold temperature at the determined illuminance level.

66. The lighting device of claim 34, wherein the control circuit is further configured to: Determine the ambient light level near the lighting device; The ambient light level is compared with a predetermined threshold. When the ambient light level exceeds a predetermined threshold, the lighting load is controlled according to a first dimming curve; and When the ambient light level is less than a predetermined threshold, the lighting load is controlled according to the second dimming curve.

67. A method for controlling an illumination load of an illumination device emitting light having a first color, the method comprising: Receive a first message indicating the second color via a wireless communication circuit; Determine whether the first color and the second color lie on the blackbody curve; In response to determining that the first color and the second color lie on the blackbody curve, the light emitted by the illumination device is faded along the blackbody curve from the first color to a plurality of correlated color temperature (CCT) chromaticity values, until the second color; and In response to determining that one or more of the first color or the second color are not on the blackbody curve, the light emitted by the illumination load is faded from the first color to the second color in the XY chromaticity space.

68. The method of claim 67, wherein the lighting load comprises a plurality of light-emitting diodes (LEDs), and wherein fading the light emitted by the lighting device along the blackbody curve from the first color to the plurality of CCT chromaticity values ​​until the second color comprises determining a target value for the luminous flux to be emitted from each of the plurality of LEDs in a discrete-time instance.

69. The method of claim 67, wherein the second color is indicated in the XY color space.

70. The method of claim 69, wherein the first message includes an x ​​chromaticity value and a y chromaticity value.

71. The method of claim 67, wherein the second color is indicated in the CCT color space.

72. The method of claim 67, wherein the blackbody curve includes a threshold distance from the blackbody curve.

73. The method of claim 72, wherein the threshold is a Δuv measurement result.

74. The method of claim 72, further comprising: The first color is determined to be greater than the threshold value from the blackbody curve, and the second color is on the blackbody curve; as well as Based on the determination that the first color is greater than the threshold distance from the blackbody curve and the second color is on the blackbody curve, the driving circuit is controlled such that the light emitted by the lighting device is linearly adjusted to the second color.

75. The method of claim 67, wherein the first color comprises a first color temperature in the CCT color space, and the second color is a second color temperature in the CCT color space.

76. The method of claim 75, wherein the second color temperature is converted from the XY color space to the CCT color space based on a set of equations stored in the memory of the lighting device.

77. The method of claim 75, wherein the second color temperature is converted from the XY color space to the CCT color space based on a lookup table stored in the memory of the lighting device.

78. The method of claim 75, wherein the light emitted by the illumination device fades in the CCT color space according to the relationship between color temperature and time.

79. The method of claim 78, wherein the relationship is a linear relationship between color temperature and time.

80. The method of claim 78, wherein the relationship is a non-linear relationship between color temperature and time, providing higher resolution relative to time when closer to a warm white temperature than when closer to a cool white temperature.

81. The method of claim 78, further comprising determining the plurality of CCT chromaticity values ​​along the blackbody curve between the first color temperature and the second color temperature, wherein the plurality of CCT chromaticity values ​​are associated with the relationship between color and temperature.

82. The method of claim 81, further comprising converting the plurality of CCT chromaticity values ​​to the XY chromaticity space to determine a plurality of XY chromaticity values.

83. The method of claim 82, further comprising: Convert the multiple CCT chromaticity values ​​into multiple UV chromaticity values; as well as The plurality of UV chromaticity values ​​are converted into the plurality of XY chromaticity values.

84. The method of claim 82, further comprising a drive circuit for controlling the lighting device based on the plurality of XY chromaticity values.

85. The method of claim 84, further comprising sequentially sending each of the plurality of XY chromaticity values ​​to the driving circuit at corresponding time instances.

86. The method of claim 85, further comprising: Determine the timeline associated with the XY chromaticity space input; as well as According to the schedule, the plurality of XY chromaticity values ​​are sent to the driving circuit.

87. The method of claim 86, further comprising: Determine the time delay between each of the plurality of XY chromaticity values; as well as The plurality of XY chromaticity values ​​are sent to the driving circuit according to the determined time delay.

88. The method of claim 67, further comprising measuring the color of the light emitted by the lighting device using one or more sensors of the lighting device.

89. The method of claim 88, further comprising: When the lighting load is controlled at the second color, the color of the light emitted by the lighting device is measured; The measured color of the lighting device is compared with the second color; as well as When the measured color differs from the second color by more than a predetermined value, the control of the lighting load is adjusted until the one or more sensors measure the second color.

90. The method of claim 67, wherein the first message includes a fade request in the XY chromaticity space.

91. The method of claim 90, wherein the fade request includes fade information associated with the second color.

92. The method of claim 67, wherein the first color is an initial color and the second color is an end color.

93. The method of claim 67, further comprising determining whether the fading from the first color to the second color occurs in the CCT color space or in the XY color space.

94. The method of claim 67, further comprising: Determine the illuminance level of the lighting load; and Determine whether the second color is below the red threshold temperature or above the blue threshold temperature at the determined illuminance level.

95. The method of claim 94, further comprising: When the second color is less than the red threshold temperature at the determined illuminance level, the lighting load is controlled such that the light emitted by the lighting device includes a third color, which is equal to or greater than the red threshold temperature at the determined illuminance level.

96. The method of claim 94, further comprising: When the second color is greater than the blue threshold temperature at the determined illuminance level, the lighting load is controlled such that the light emitted by the lighting device includes a third color, which is equal to or less than the blue threshold temperature at the determined illuminance level.

97. The method of claim 67, further comprising: Determine the ambient light level near the lighting device; The ambient light level is compared with a predetermined threshold. When the ambient light level exceeds a predetermined threshold, the lighting load is controlled according to a first dimming curve; and When the ambient light level is less than a predetermined threshold, the lighting load is controlled according to the second dimming curve.

98. A non-transitory computer-readable storage medium having program instructions stored thereon, the program instructions causing the processor, when executed by a processor, to perform the method as described in any one of claims 67 to 97.

99. A computer program product comprising program instructions that, when executed by a processor, cause the processor to perform the method as described in any one of claims 67 to 97.

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