White light tuning with duv adjustment

Abstract

A lighting device includes a warm correlated color temperature (CCT) light emitting diode (LED) configured to emit warm white light and a cold CCT LED configured to emit cold white light. The lighting device further includes a green LED configured to emit green light having a green luminous flux controlled based on a flux of cold white light or a flux of warm white light, where a value corresponding to the green luminous flux is obtained from the lookup table. The lighting device further includes a [delta] u, v (Duv) adjustment LED configured to emit Duv adjustment light having an adjustment total flux including an adjustment flux amount, the adjustment flux amount having a maximum flux value determined by iteratively adjusting the adjustment flux amount until a Duv of a combined light including the warm white light and the Duv adjustment light is less than a threshold.

Description

Technical Field

[0001] The present disclosure relates generally to lighting solutions, and more particularly to white light tuning with Δu,v (Duv) adjustment. Background Art

[0002] The correlated color temperature (CCT) of white light emitted by a light emitting diode (LED) lighting fixture can be changed, for example, by changing the CCT setting of the lighting fixture. For example, the CCT of light emitted by the lighting fixture can be adjusted between (including the endpoints) a warm CCT (e.g., 2700-3000K) and a cold CCT (e.g., 5000K-6500K). For example, white light color tuning can be performed by combining warm white light and cold white light, resulting in combined light having a composite CCT that depends on the flux of the two lights. On a chromaticity diagram, the composite CCT is located on a straight line connecting the CCT of warm white light and the CCT of cold white light. In order to produce a combined white light having a CCT value that is closer to a black body radiation curve (BBC), CCT-adjusted light (e.g., green light) can be combined with warm white light and cold white light by controlling the flux of the CCT-adjusted light based on a lookup table. However, if the flux of the CCT-adjusted light in the lookup table is determined based on the warm CCT and the cold CCT being on the BBC curve or having a Δu,v (Duv) close to zero, the adjustment caused by the addition of green light may not produce the desired results. For example, warm white light emitted by different LEDs may typically be several standard deviation orders (or MacAdam orders) of color matching (SDCM) away from each other and several standard deviation orders (or MacAdam orders) of color matching (SDCM) away from a warm CCT value (e.g., 2700K) on the BBC curve. Cold white light emitted by different LEDs may also typically be several SDCM orders away from each other and several SDCM orders away from a cold CCT value (e.g., 6500K) on the BBC curve. Therefore, a solution that enables the use of a lookup table to more reliably reduce the deviation of the white light tuning curve from the BBC is desired. Summary of the invention

[0003] The present disclosure relates generally to lighting and location-based systems, and more particularly to lighting solutions, and more particularly to white light tuning. In an example embodiment, a lighting device includes a warm CCT light emitting diode (LED) configured to emit warm white light with a warm CCT value and a cold CCT LED configured to emit cold white light with a cold CCT value. The lighting device further includes a green LED configured to emit green light having a green light flux. The green light flux is controlled based on the flux of the cold white light or the flux of the warm white light, wherein a value corresponding to the green light flux is obtained from a lookup table, the lookup table including a value corresponding to the green light flux and a value corresponding to the flux of the cold white light or the flux of the warm white light. The lighting device further includes a Δu,v (Duv) adjustment LED configured to emit Duv adjusted light having an adjusted total flux including an adjusted flux amount. The adjusted flux amount has a maximum flux value, which is determined by iteratively adjusting the adjusted flux amount when the cool white light and the green light are turned off until Duv of the combined light including the warm white light and the Duv adjusted light is less than a threshold value. After the maximum flux value is determined, the adjusted flux amount is controlled based on the maximum flux value and based on a value of the flux corresponding to the cool white light or a value of the flux corresponding to the warm white light.

[0004] These and other aspects, objects, features and embodiments will be apparent from the following description and appended claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0005] Reference will now be made to the accompanying drawings, which are not necessarily drawn to scale, and in which:

[0006] Figure 1 illustrates a white light tuning path curve relative to a black body curve (BBC) in a CIE 1976 uniform color space according to an example embodiment;

[0007] Figure 2 A system including a lighting device and a Duv measuring device for determining a maximum flux value of a Duv regulated flux according to an example embodiment is illustrated; and

[0008] Figure 3 FIG. 1 illustrates an exemplary embodiment of the present invention. Figure 2 A system including details of lighting equipment.

[0009] The accompanying drawings illustrate only example embodiments and therefore should not be considered to limit the scope. The elements and features shown in the drawings are not necessarily to scale, instead emphasis is placed on clearly illustrating the principles of the example embodiments. Additionally, certain dimensions or positions may be exaggerated to help convey these principles visually. In the accompanying drawings, the same reference numerals used in different figures represent similar or corresponding, but not necessarily identical, elements. DETAILED DESCRIPTION

[0010] In the following paragraphs, example embodiments will be described in more detail with reference to the accompanying drawings. In the description, well-known components, methods and / or processing techniques are omitted or briefly described. In addition, mentioning various (multiple) features of the embodiment does not mean that all embodiments must include the mentioned (multiple) features.

[0011] Figure 1 A white light tuning path curve is illustrated relative to a black body curve (BBC) 102 in a CIE 1976 uniform color space according to an example embodiment. In some example embodiments, a warm CCT point 104 is on the BBC 102 and may correspond to a warm CCT value (e.g., 2700K, 3000K, another value in the range of 2500K to 3000K). The CCT point 104 may be within a MacAdam ellipse 122. For example, the warm CCT point 104 may be a center value of the MacAdam ellipse 122 (i.e., a warm CCT center value). A cold CCT point 106 may be on the BBC 102 and within the MacAdam ellipse 124. The cold CCT point 106 may correspond to a cold CCT value (e.g., 6000K, 6500K, another value in the range of 6000K to 7000K). For example, the cold CCT point 106 may be a center value of the MacAdam ellipse 124 (i.e., a cold CCT center value). The MacAdam ellipse 122 and the MacAdam ellipse 124 may each be a 3rd order, 5th order, or 7th order MacAdam ellipse.

[0012] White light tuning performed strictly based on warm white light having a warm CCT value (e.g., at warm CCT point 104) and cool white light having a cool CCT value (e.g., at cool CCT point 106) may follow white light tuning curve 108. That is, the combined light produced by the mixture of warm white light and cool white light has a CCT on white light tuning curve 108. For example, white light tuning that follows white light tuning curve 108 may be based on a user CCT setting input. As in Figure 1 As can be seen in FIG. 1 , the deviation of the white light tuning curve 108 from the BBC 102 is greater for CCT values ​​that are farther away from the warm CCT and the cool CCT on the white light tuning curve 108 .

[0013] In some example embodiments, white light tuning may be performed by introducing a third light. For example, a lookup table may be used to add a third light to the mix of warm white light and cool white light to reduce the deviation of the white light tuning curve from the BBC. For example, U.S. Pat. No. 10,863,599, which is incorporated herein by reference, describes the generation of a lookup table and the use of a lookup table for introducing green light (i.e., phosphor-converted green light, which may also be referred to as lime light). For illustration, a lookup table stored in a memory device and including values ​​corresponding to a flux of cool white light (e.g., a CCT value of 6500K) associated with corresponding values ​​corresponding to a flux of green light may be used to control the amount of flux of green light combined with warm white light and cool white light to perform white light tuning.

[0014] Table 1 below is an example lookup table that includes the flux corresponding to warm white light (warm flux), cold white light flux (cold flux) and green flux (green flux). For example, the values ​​in Table 1 can be relative to the warm flux and cold flux The values ​​in Table 1 can be used to control the heating flux and cold flux Combined Green Flux The amount of , to perform white light tuning that follows a white light tuning curve having a smaller deviation from the BBC than the white light tuning curve 108. Figure 1 , lines such as line 126 illustratively show the green flux that needs to be introduced to produce a white light tuning curve that matches BBC 102. The amount.

[0015] For illustration, the green flux is introduced The amount can be based on the heating flux The heating flux is controlled by The amount of is determined, for example, based on the current flowing through the warm CCT LED emitting warm white light or based on a user CCT setting input. For example, as shown in Table 1, when the warm flux and cold flux 10% of the sum is composed of heating flux When contributing, the green light can be controlled so that the green flux The quantity is the heat flux and cold flux As another example, when the heat flux and cold flux 70% of the total is composed of heating flux When contributing, the green light can be controlled so that the green flux The quantity is the heat flux and cold flux 9.3% of the sum.

[0016] Alternatively, the introduction of green flux The amount can be based on the cold flux The amount of cold flux is controlled by The amount of is determined, for example, based on the current flowing through the cool CCT LED emitting cool white light or based on a user CCT setting input. For example, as shown in Table 1, when the warm flux and cold flux 10% of the sum is composed of cold flux When contributing, the green light can be controlled so that the green flux The quantity is the heat flux and cold flux As another example, when the heat flux and cold flux 70% of the total is composed of heating flux When contributing, the green light can be controlled so that the green flux The quantity is the heat flux and cold flux 8.4% of the sum.

[0017]

[0018] Table 1

[0019] In some example embodiments, Table 1 may include duty cycle values, relative to other sums (e.g., heat flux Cold Flux and green flux The value is a percentage of the sum of the heating flux, normalized flux value, CCT setting input value, current value, or other value, rather than relative to the heating flux. and cold flux Usually, it corresponds to the heat flux or cold flux Different types of values ​​can be mapped to correspond to green fluxes value and can be used to control the heating flux and cold flux Combined Green Flux An amount of φt is used to perform white light tuning that follows a white light tuning curve having a smaller deviation from the BBC than curve 108.

[0020] In some example embodiments, a lookup table (such as lookup table 1) is generated based on an assumption that the warm CCT value (e.g., 2700K) of the warm white light emitted by one or more LEDs is at the location of the warm CCT point 104 and based on an assumption that the cool CCT value (e.g., 6500K) of the cool white light emitted by one or more LEDs is at the location of the cool CCT point 106. That is, based on these assumptions, a lookup table corresponding to the green flux is generated. , to reduce the deviation of the white light tuning curve 108 from the BBC 102. In practice, the warm CCT value of the warm white light (e.g., 2700K) may be at other positions in the MacAdam ellipse 122 (i.e., including the perimeter of the MacAdam ellipse 122), and the cool CCT value of the cool white light (e.g., 6500K) may be at other positions in the MacAdam ellipse 124 (i.e., including the perimeter of the MacAdam ellipse 124). That is, the deviation of the actual white light tuning curve from the BBC 102 that needs to be reduced may be different from the deviation of the white light tuning curve 108 from the BBC 102.

[0021] For illustration, a warm CCT value (e.g., 2700K) of warm white light emitted by one or more LEDs may be at position 110 in MacAdam ellipse 122. For example, position 110 may be 7 steps away from warm CCT point 104, which is the warm CCT center value of MacAdam ellipse 122. A cool CCT value (e.g., 6500K) of cool white light emitted by one or more LEDs may be at position 112 in MacAdam ellipse 124. For example, position 112 may be 7 steps away from cool CCT point 106, which is the cool CCT center value of MacAdam ellipse 124. Figure 1 As clearly shown in FIG. 1 , the white light tuning curve 114 connecting position 110 and position 112 is above BBC 102 and is different from the white light tuning curve 108 connecting warm CCT point 104 and cold CCT point 106. In fact, because the warm CCT value of warm white light (e.g., 2700K) may be at a location other than the warm CCT point 104 in MacAdam ellipse 122, and because the cold CCT value of cold white light (e.g., 6500K) may be at a location other than the cold CCT point 106 in MacAdam ellipse 124, the white light tuning curve may be above, below, or cross BBC 102 and thus different from the white light tuning curve 108. Because the green flux corresponding to Table 1 is generated The value of is to reduce the deviation of the white light tuning curve 108 from the BBC 102 (ie, based on the warm CCT point 104 and / or the cold CCT point 106) and is not based on the white light tuning curve 114, so the green flux in Table 1 is used. To reduce the deviation of the white light tuning curve 114 from the BBC 102 may require considering the Duv of the warm white light at the location 110 (ie, the distance from the BBC 102 ) and the Duv of the cool white light at the location 112 .

[0022] In some example embodiments, Duv adjusted light may be added to warm white light having a warm CCT value (e.g., 2700K) at position 110 to produce combined light having a warm CCT value (e.g., 2700K) that is within the MacAdam ellipse 122 but at a smaller distance (i.e., smaller Duv) from the BBC 102 than the warm CCT value (e.g., 2700K) at position 110. To illustrate, violet light (e.g., a mixture of blue light and red light) may be added to warm white light having a warm CCT value at position 110 to produce combined light having a warm CCT value that is less than a threshold value (e.g., 0.001, 0.003, 0.006) from the BBC 102. In general, introducing violet light into warm white light and / or cool white light may result in a CCT value of the resulting light that is within the range determined by Figure 1 The Duv of the warm CCT value of the combined light is changed in the direction shown by the arrow next to the text "purple" in the text. The Duv of the warm CCT value of the combined light depends on the flux of the violet light (violet flux). For example, the violet light may have an adjusted flux amount, which may have a maximum flux value relative to the warm CCT value at position 110, and result in a combined light having a warm CCT value in the MacAdam ellipse 122 having a Duv less than a threshold. For illustration, the maximum flux value of the adjusted flux amount of the violet flux relative to the warm CCT value may result in a combined light having a warm CCT value (e.g., 2700K) in the MacAdam ellipse 122 and at position 116 on the BBC 102.

[0023] In some example embodiments, Duv adjusted light may be added to cool white light having a cool CCT value (e.g., 6500K) at position 112 to produce combined light having a cool CCT value (e.g., 6500K) that is within the MacAdam ellipse 124 but at a smaller distance (i.e., a smaller Duv) from the BBC 102 than the cool white light having the cool CCT value at position 112. To illustrate, violet light (e.g., a mixture of blue light and red light) may be added to the cool white light having a cool CCT value at position 112 to produce combined light having a cool CCT value Duv that is less than a threshold value (e.g., 0.001, 0.003, 0.006) from the BBC 102. The Duv of the cool CCT value of the combined light within the MacAdam ellipse 124 depends on the flux of violet light (violet flux). For example, the amount of regulated flux (e.g., the amount of violet flux) may have another maximum flux value relative to the cold CCT value at position 112, wherein the maximum flux value may result in combined light having a cold CCT value in MacAdam ellipse 124 with a Duv less than a threshold. The maximum flux value of the regulated flux amount of violet flux relative to the cold CCT value may result in combined light having a cold CCT value (e.g., 6500K) in MacAdam ellipse 124 and at position 118 on BBC 102. White light tuning curve 120 connects position 116 and position 118 and corresponds to a white light tuning path based on warm flux relative to warm CCT value. and purple flux, and based on the cold flux relative to the cold CCT value and Purple Flux combination.

[0024] In general, the Duv adjusted light (e.g., violet light) may have an adjusted total flux including an adjusted flux amount relative to a warm CCT value (e.g., 2700K) and an adjusted flux amount relative to a cold CCT value (e.g., 6500K). For example, when the cold white light is turned off, the warm white light may have a maximum flux value as shown in Table 1 (last row), and the adjusted total flux of the violet light may be the maximum flux value of the violet light relative to the warm white light, which results in a combined light having a warm CCT at position 116. When the warm white light is turned off, the cold white light may have a maximum flux value as shown in Table 1 (first row), and the adjusted total flux of the violet light may be equal to the maximum flux value of the violet light relative to the cold white light, which results in a combined light having a cold CCT at position 118.

[0025] When both warm white light and cool white light are turned on, the total regulated flux of purple light can be the sum of the ratio of purple light to the maximum flux value of warm white light and the ratio of purple light to the maximum flux value of cool white light. The ratio of purple light to the maximum flux value of warm white light is based on the warm flux. and HVAC and cold flux The ratio of the maximum flux of violet light to that of cool white light is based on Figure 1 The cold flux shown in and HVAC and cold flux For example, as shown in Table 1, when the heat flux and cold flux 10% of the sum is composed of heating flux When the contribution is , the adjusted total flux of the purple light can be the sum of 10% of the maximum flux value of the purple light relative to the warm white light and 90% of the maximum flux value of the purple light relative to the cool white light. As another example, as shown in Table 1, when the warm flux and cold flux 70% of the total is composed of heating flux When the contribution is 0.04W, the adjusted total flux of the purple light can be the sum of 70% of the maximum flux value of the purple light relative to the warm white light and 30% of the maximum flux value of the purple light relative to the cool white light.

[0026] Table 2 below shows the corresponding green flux The value of the combined flux associated with the value of corresponds to the value. For example, in Table 2, the value marked as The columns show the corresponding heat flux The value of the combined flux of and the ratio of the maximum flux value of violet light to warm white light. For clarity, the maximum flux value of violet light to warm white light is the maximum flux value of the combined adjusted flux (i.e., violet flux) that results in a warm white light with a warm CCT at position 110 and violet light with a warm CCT at position 116. For example, the maximum flux value of violet light to warm white light may be a warm flux of 4.7% and the combined flux It can be heating flux 104.7%.

[0027] Mark as The columns show the corresponding cold flux The value of the combined flux of and the ratio of the maximum flux value of violet light to the cool white light. The maximum flux value of violet light to the cool white light is the maximum flux value of the combined adjusted flux (i.e., violet flux) that results in the cool white light having a cool CCT at position 112 and the violet light having a cool CCT at position 118. For example, the maximum flux value of violet light to the cool white light may be the cool flux 4% and the combined flux Can be cold flux As another example, when the cold flux is the heating flux and cold flux When the sum of the values ​​of the purple light and the cold white light is 90% (i.e., the second row in Table 1), 90% of the maximum flux value of the purple light relative to the cold white light can be compared with the cold flux value. 90% combination, resulting in a combined flux having the values ​​shown in the second row of Table 2 When the cold flux is 90% (i.e., HFC is the heating flux and cold flux 10% of the sum of the purple light and warm white light, 10% of the maximum flux value of the purple light relative to the warm white light can be compared with the warm flux 10% combination, resulting in a combined flux having the values ​​shown in the second row of Table 2 When the cold flux is 90% and the HVAC When it is 10%, the adjusted total flux of the purple light is the sum of 90% of the maximum flux value of the purple light relative to the cold white light and 10% of the maximum flux value of the purple light relative to the warm white light.

[0028]

[0029] Table 2

[0030] As mentioned above, green flux HVAC and / or cold flux With the introduction of violet light (or another Duv regulated light), the green flux Can be combined with flux and combined flux combination, so that the CCT ratio of the entire combined light Figure 1 White light tuning curve 108 and white light tuning curve 120 shown in FIG. 1 are closer to BBC 102 .

[0031] In some example embodiments, for example, at a location 128 below the BBC 102 in the MacAdam ellipse 122, the warm white light may have a warm CCT value (e.g., 2700K). Another Duv adjusted light may be added to the warm white light having a warm CCT value at the location 128 to produce a combined light having a warm CCT value (e.g., 2700K) that is in the MacAdam ellipse 122 but has a Duv that is smaller than the warm CCT value at the location 128. To illustrate, a second green light (e.g., another green light other than the green light described with respect to Tables 1 and 2) may be added to the warm white light having a warm CCT value at the location 128 to produce a combined light having a warm CCT value that is less than a threshold value (e.g., 0.001, 0.003, 0.006) from the BBC 102. In general, introducing a second green light into the warm white light and / or the cool white light may cause the CCT value of the resulting light to be within a range determined by Figure 1 The Duv of the warm CCT value of the combined light in the MacAdam ellipse 122 depends on the flux of the second green light. For example, the second green light may have an adjusted flux amount with respect to the warm CCT value at position 128 having a maximum flux value, and this results in the combined light having a warm CCT value in the MacAdam ellipse 122 having a Duv less than a threshold. In some alternative embodiments, instead of the green flux of the second green light, an increased green flux amount (i.e., resulting in a green flux described with respect to Tables 1 and 2) may be used. The increase in the amount of heat flux combination.

[0032] In some example embodiments, for example, at a position 130 below the BBC 102 in the MacAdam ellipse 124, the cool white light may have a cool CCT value (e.g., 6500K). Another Duv adjusted light may be added to the cool white light having a cool CCT value at the position 130 to produce a combined light having a cool CCT value (e.g., 6500K) that is in the MacAdam ellipse 124 but has a Duv smaller than the cool CCT value at the position 130. To illustrate, a second green light may be added to the cool white light having a cool CCT value at the position 130 to produce a combined light having a cool CCT value that has a Duv value less than a threshold value (e.g., 0.001, 0.003, 0.006) from the BBC 102. The Duv of the cool CCT value of the combined light in the MacAdam ellipse 124 depends on the flux of the second green light. For example, the second green light may have an adjusted flux amount with a maximum flux value relative to the cold CCT value at position 130, and this results in the combined light having a cold CCT value in MacAdam ellipse 124 having a Duv less than a threshold. In some alternative embodiments, instead of a green flux of the second green light, an increased green flux amount (i.e., resulting in a green flux described with respect to Tables 1 and 2) The increase in the amount of cold flux Typically, the second green light may have an adjusted total flux that includes an adjusted flux amount relative to a warm CCT value at position 128 (eg, 2700K) and / or an adjusted flux amount relative to a cool CCT value at position 130 (eg, 6500K).

[0033] As mentioned above, the green flux described in Table 1 HVAC and / or cold flux The combination makes the resulting white light tuning curve closer to BBC 102 than white light tuning curve 108. With the introduction of the second green light, the green flux described in Table 1 Can be combined with flux (i.e., heating flux and the corresponding flux of the second green light) and the combined flux (i.e., cold flux and the corresponding flux of the second green light) so that the CCT ratio of the entire combined light is Figure 1 White light tuning curve 108 and white light tuning curve 120 shown in FIG. 1 are closer to BBC 102 .

[0034] By introducing Duv adjusted light (e.g., violet light or second green light) into warm white light having a warm CCT value (e.g., 2700K), the warm CCT value of the warm white light can be moved to a position on the Duv threshold of the BBC 102 or otherwise within the Duv threshold of the BBC 102. By introducing Duv adjusted light (e.g., violet light or second green light) into cool white light having a cool CCT value (e.g., 6500K), the cool CCT value of the cool white light can be moved to a position on the Duv threshold of the BBC 102 or otherwise within the Duv threshold of the BBC 102. By introducing one or more Duv adjusted lights (e.g., violet light and / or second green light) into warm white light having a warm CCT value (e.g., 2700K), cool white light having a cool CCT value (e.g., 6500K), and a green flux controlled based on a lookup table (e.g., Table 1), the green flux of the cool white light can be moved to a position on the Duv threshold of the BBC 102 or otherwise within the Duv threshold of the BBC 102. The white light tuning curve of the resulting combined light may be closer to BBC 102 than the white light tuning curve of the light not adjusted based on one or more Duvs.

[0035] In some alternative embodiments, the warm CCT point 104 and the cold CCT point 106 may be in different positions than shown without departing from the scope of the present disclosure. In some alternative embodiments, the MacAdam ellipses 122, 124 may each have an elliptical shape different than shown without departing from the scope of the present disclosure. The positions 110, 112, 116, 118, 128, 130 in the MacAdam ellipses 122 or 124 may be in different positions than shown without departing from the scope of the present disclosure. In some alternative embodiments, another light may be used instead of violet light without departing from the scope of the present disclosure. In some alternative embodiments, another light may be used instead of green light without departing from the scope of the present disclosure.

[0036] Figure 2 A system 200 is illustrated according to an example embodiment, which includes a lighting device 202 and a Duv measuring device 224 for determining a maximum flux value of a Duv regulated flux. Figure 1 and Figure 2In some example embodiments, the lighting device 202 may include a driver 204 (e.g., an LED driver), a controller 206, a memory device 208 (e.g., a flash memory device), and an input interface 210. The lighting device 202 may also include a dimming input interface 212 and a light module 226. The controller 206 may include a microprocessor or microcontroller that executes software code stored in the memory device 208 and uses other data stored in the memory device 208 to perform operations described herein with respect to the controller 206. For example, one or more lookup tables (e.g., Table 1) and other data may be stored in the memory device 208, and the controller 206 may use the information to control the light 228 provided by the lighting device 202. For illustration, the input interface 210 may include a wired and / or wireless communication unit that receives user inputs (such as dimming level setting inputs and CCT setting inputs), and the controller 206 may control the driver 204 and / or the light module 226 based on the user inputs to control the light 228 provided by the light module 226. Alternatively or additionally, the input interface 210 may include a physical user input interface (eg, a dip switch, a knob, etc.) for a user to provide direct input to the lighting device 202 .

[0037] In some example embodiments, the light module 226 may include a warm CCT LED 214, a cool CCT LED 216, and a green LED 218. The warm CCT LED 214 may emit warm white light having a warm CCT (e.g., 2700K, 3000K), and may have the same color scheme as described above. Figure 1 And the heating flux described in Tables 1 and 2 Heating flux The amount of depends on the current flowing through the warm CCT LED 214. The cold CCT LED 216 can emit cool white light with a cool CCT (e.g., 5000K, 6000K, 6500K) and can have the above Figure 1 and the cold flux described in Tables 1 and 2 The green LED 218 may emit green light (i.e., light having a green wavelength in the visible spectrum) and may have the same properties as described above with respect to Figure 1 and the green flux described in Tables 1 and 2 For example, the green light may be phosphor converted green light.

[0038] Usually, the HFC The amount of cold flux Amount and green flux The amount of green flux depends on the current flowing through the warm CCT LED 214, the cold CCT LED 216 and the green LED 218, respectively. As mentioned above, the green flux The amount is based on the HVAC provided by a lookup table such as Table 1 or cold flux For illustration, the controller 206 can control the amount of current flowing through each of the warm CCT LED 214 and the cold CCT LED 216 based on the CCT setting input provided via the input interface 210. The controller 206 can control the amount of current flowing through the green LED 218 based on a lookup table (e.g., Table 1) that maps to the warm flux Amount and / or cold flux The amount of green flux The amount.

[0039] In some example embodiments, the light module 226 may include a purple LED 220 and a second green LED 222. The purple LED 220 may provide purple light generated by a mixture of blue light and red light. For example, the purple LED 220 may include some LEDs that emit blue light and some LEDs that emit red light. The second green LED 222 may emit a second green light. For example, the purple light and the second green light may be used as Duv adjustment light, as described above with respect to Figure 1 The controller 206 may control the amount of current provided to the purple LED 220 and the second green LED 222 .

[0040] For illustration, the controller 206 can control the flux of the violet light (i.e., the amount of violet flux) by controlling the amount of current provided to the violet LED 220. As described above, the violet light used as the Duv adjusted light can be combined with the warm white light emitted by the warm CCT LED 214, wherein the maximum flux value of the violet flux (i.e., the maximum flux value of the adjusted flux amount) can result in a combined light (i.e., a combination of warm white light and violet light) having a warm CCT value (e.g., 2700K) located on the BBC 102 (e.g., at position 116). For example, the warm CCT value of the warm white light can be at position 110 in the MacAdam ellipse 122.

[0041] In some example embodiments, a Duv measurement device 224 (e.g., a spectrometer) may be used to determine the maximum flux value of the violet flux relative to the warm CCT value. For illustration, the controller 206 may control the current provided to the cool CCT LED 216, the green LED 218, and the second green LED 222 so that the cool white light, the green light, and the second green light are turned off. When the cool white light, the green light, and the second green light are turned off, the controller 206 may control the current provided to the warm CCT LED 214 so that the warm white light has a warm flux. The maximum flux value of is, for example, as shown in the last row of Table 1. When the cool white light, the green light and the second green light are turned off, and when the warm flux When having a maximum value, the controller 206 can iteratively adjust the current provided to the violet LED 220 based on the Duv measurement value indicated by the Duv measurement device 224 , which can continuously measure the Duv of the CCT of the light 228 provided by the lighting device 202 .

[0042] For illustration, when the cool white light, the green light, and the second green light are turned off and the warm white light and the violet light are turned on, the light 228 includes warm white light and violet light. The Duv measurement device 224 can measure the Duv of the CCT of the light 228, and the measured Duv value can be continuously provided to the controller 206, for example, via the adjustment input interface 212. The controller 206 can adjust (i.e., increase or decrease) the current provided to the violet LED 220 by the driver 204 accordingly to iteratively change the flux of the violet light until the Duv of the CCT of the light 228 is less than or equal to a threshold value (e.g., 0.001, 0.003, etc.). The specific amount of current provided to the violet LED 220 that causes the Duv of the CCT of the light 228 to be less than or equal to the threshold value corresponds to the maximum flux value of the violet flux relative to the warm CCT value and the warm white light. As described with respect to Figure 1 As described, the maximum flux value of violet flux relative to the warm CCT value and warm white light is the amount of violet flux that results in combined light produced by a combination of warm white light and violet light having a warm CCT on or near BBC 102 (e.g., at position 116) rather than, for example, at position 110.

[0043] In some example embodiments, the controller 206 may store one or more values ​​in the memory device 208 that correspond to or otherwise indicate a particular current amount and / or maximum flux value for purple flux relative to warm CCT values ​​and warm white light as determined using the Duv measurement device 224. For example, Table 2 at the position labeled Each row of the column shows the value corresponding to the purple flux relative to the warm CCT value and the value corresponding to the warm flux For illustration, in the last row of Table 2, The example value 104.7% under the column includes: 100% as HVAC It is expressed as heat flux and cold flux The percentage of the sum (i.e., the cold flux = zero); and 4.7% as the purple flux, which is expressed as the cold flux Heat flux equal to zero The value 4.7% is the maximum flux value of purple light relative to the warm CCT value and warm white light as determined by using the Duv measurement device 224. Because the warm flux is the heating flux and cold flux The sum of the values ​​of 224 and 225 is 100%, so the violet flux amount is 100% of the maximum flux value of the violet flux as determined by using the Duv measurement device 224.

[0044] In some example embodiments, when the heat flux is the heating flux and cold flux 90% of the sum (i.e., cold flux is 10% of the total), the value corresponding to the purple flux relative to the warm CCT value is the same percentage (i.e., 90%) of the maximum flux value of the purple flux (i.e., 4.7%). As another example, when the warm flux is the heating flux and cold flux 30% of the sum (i.e., cold flux is 70% of the total), the value corresponding to the purple flux relative to the warm CCT value is the same percentage (i.e., 30%) of the maximum flux value (i.e., 4.7%) of the purple flux. Generally, in Table 2, Each row under the column can include The corresponding value is the sum of the values ​​corresponding to the purple flux relative to the warm CCT value.

[0045] In some example embodiments, the controller 206 may control the current supplied to the cold CCT LED 216, the green LED 218, and the second green LED 222 so that the warm white light, the green light, and the second green light are turned off. When the warm white light, the green light, and the second green light are turned off, the controller 206 may control the current supplied to the cold CCT LED 216 so that the cold flux of the cold white light is has a maximum flux value, such as shown in the first row of Table 1. When the warm white light, the green light and the second green light are turned off, and when the cold flux When having a maximum value, the controller 206 can iteratively adjust the current provided to the violet LED 220 based on the Duv measurement value indicated by the Duv measurement device 224 , which can continuously measure the Duv of the CCT of the light 228 provided by the lighting device 202 .

[0046] For illustration, when the warm white light, the green light, and the second green light are turned off and the cool white light and the violet light are turned on, the light 228 includes cool white light and violet light. The Duv measurement device 224 can measure the Duv of the CCT of the light 228, and the measured Duv value can be continuously provided to the controller 206, for example, via the adjustment input interface 212. The controller 206 can adjust (i.e., increase or decrease) the current provided to the violet LED 220 by the driver 204 accordingly to iteratively change the flux of the violet light until the Duv of the CCT of the light 228 is less than or equal to a threshold value (e.g., 0.001, 0.003, etc.). The specific amount of current provided to the violet LED 220 that causes the Duv of the CCT of the light 228 to be less than or equal to the threshold value corresponds to the maximum flux value of the violet flux relative to the cool CCT value and the cool white light. As described with respect to Figure 1 As described, the violet flux relative to the cool CCT value and the maximum flux value of cool white light is the amount of violet flux that results in combined light produced by the combination of cool white light and violet light having a cool CCT on or near BBC 102 (e.g., at position 118) rather than, for example, at position 112.

[0047] In some example embodiments, the controller 206 may store one or more values ​​in the memory device 208 that correspond to or otherwise indicate a particular current amount and / or maximum flux value for violet flux relative to a cool CCT value and cool white light as determined using the Duv measurement device 224. For example, Table 2 at the position labeled Each row of the column shows the value corresponding to the purple flux relative to the cold CCT value and the value corresponding to the cold flux For example, in the first row of Table 2, The example value 104.0% under the column includes: 100% as corresponding to the cold flux The value of which is expressed as the heating flux and cold flux The percentage of the sum of = zero); and 4.0% as the value corresponding to the purple flux, which is expressed as when the heat flux Cold flux equals zero The value 4.0% is the maximum flux value of purple flux relative to the cold CCT value and cold white light as determined by using the Duv measurement device 224. Because the cold flux is the heating flux and cold flux The sum of 4.0% and 100% of each other, so the value corresponding to the violet flux amount (ie, 4.0%) is 100% of the maximum flux value of the violet flux as determined by using the Duv measurement device 224.

[0048] In some example embodiments, when the heat flux is the heating flux and cold flux 90% of the sum (i.e., the heating flux is 10% of the total), the value corresponding to the violet flux relative to the cool CCT value is the same percentage (i.e., 90%) of the violet flux relative to the cool CCT value and the maximum flux value of cool white light. As another example, when the cool flux is the heating flux and cold flux 70% of the sum (i.e., heating flux is 30% of the total), the value corresponding to the purple flux relative to the cold CCT value is the same percentage (i.e., 70%) of the maximum flux value of the purple flux relative to the cold CCT value. Generally, in Table 2, Each row under the column can include the cold flux The corresponding value and the sum of the values ​​corresponding to the purple flux relative to the cold CCT value.

[0049] In some example embodiments, after the value corresponding to the violet flux relative to the warm CCT value and / or the value corresponding to the violet flux relative to the cold CCT value is determined and stored in the memory device 208, the controller 206 may use the stored values ​​to calculate the value of the violet flux relative to the cold CCT value based on the value corresponding to the warm flux. The value or corresponding to the cold flux The value of controls the current flowing through the purple LED 220 to control the total flux of the purple light (i.e., adjust the total flux). Generally, the purple light can have a total flux (i.e., adjust the total flux), which is the sum of (1) a first purple flux amount having a maximum flux value relative to the warm CCT value and the warm white light (i.e., the first adjusted flux amount) and (2) a second purple flux amount having a maximum flux value relative to the cool CCT value and the cool white light (i.e., the second adjusted flux amount).

[0050] In some example embodiments, the second green light emitted by the second green LED 222, rather than the violet light emitted by the violet LED 220, may be required to produce a combined light having a warm CCT value on the BBC 102. The maximum flux value of the green flux of the second green light (i.e., the second green flux) relative to the warm CCT value may be determined using the Duv measurement device 224. For illustration, the controller 206 may control the current provided to the cold CCT LED 216, the green LED 218, and the violet LED 220 so that the cold white light, the green light, and the violet light are turned off. When the cold white light, the green light, and the violet light are turned off, the controller 206 may control the current provided to the warm CCT LED 214 so that the warm white light has a warm flux value. The maximum flux value of is, for example, shown in the last row of Table 1. When the cool white light, green light and violet light are turned off, and when the warm flux Having a maximum value, the controller 206 can iteratively adjust the current provided to the second green LED 222 based on the Duv measurement value indicated by the Duv measurement device 224 , which can continuously measure the Duv of the CCT of the light 228 provided by the lighting device 202 .

[0051] For illustration, when the cool white light, green light, and violet light are turned off and the warm white light and the second green light are turned on, the light 228 includes warm white light and the second green light. The Duv measurement device 224 can measure the Duv of the CCT of the light 228, and the measured Duv value can be continuously provided to the controller 206, for example, via the adjustment input interface 212. The controller 206 can adjust (i.e., increase or decrease) the current provided by the driver 204 to the second green LED 222 accordingly to iteratively change the flux of the second green light until the Duv of the CCT of the light 228 is less than or equal to a threshold value (e.g., 0.001, 0.003, etc.). The specific amount of current provided to the second green LED 222 that causes the Duv of the CCT of the light 228 to be less than or equal to the threshold value corresponds to the maximum flux value of the second green light flux relative to the warm CCT value and the warm white light. As described with respect to Figure 1 As described, the maximum flux value of the second (i.e., additional) green flux relative to the warm CCT value and the warm white light is the amount of the second green flux that results in a combined light (i.e., a combination of the warm white light and the second green light) having a warm CCT on or near the BBC 102, but not, for example, at the position 128. Relative to the warm CCT value / warm white light, the controller 206 may store in the memory device 208 the maximum flux value of the second green flux and other values ​​of the second green flux, which are determined in the same manner as described above with respect to the violet light emitted by the violet LED 220.

[0052] In some example embodiments, the second green light emitted by the second green LED 222, rather than the violet light emitted by the violet LED 220, may be required to produce a combined light having a cool CCT value on the BBC 102. A maximum flux value of the green flux of the second green light (i.e., the second green flux) relative to the cool CCT value may be determined using the Duv measurement device 224. For illustration, the controller 206 may control the current provided to the cool CCT LED 216, the green LED 218, and the violet LED 220 so that the warm white light, the green light, and the violet light are turned off. When the warm white light, the green light, and the violet light are turned off, the controller 206 may control the current provided to the cool CCT LED 216 so that the cool flux of the cool white light is has a maximum flux value. When the warm white light, green light and second green light are turned off, and when the cold flux When having a maximum value, the controller 206 can iteratively adjust the current provided to the violet LED 220 based on the Duv measurement value indicated by the Duv measurement device 224 , which can continuously measure the Duv of the CCT of the light 228 provided by the lighting device 202 .

[0053] For illustration, when the warm white light, green light, and violet light are turned off and the cool white light and the second green light are turned on, the light 228 includes cool white light and the second green light. The Duv measurement device 224 can measure the Duv of the CCT of the light 228, and the measured Duv value can be continuously provided to the controller 206, for example, via the adjustment input interface 212. The controller 206 can adjust (i.e., increase or decrease) the current provided by the driver 204 to the second green LED 222 accordingly to iteratively change the flux of the second green light until the Duv of the CCT of the light 228 is less than or equal to a threshold value (e.g., 0.001, 0.003, etc.). The specific amount of current provided to the second green LED 222 that causes the Duv of the CCT of the light 228 to be less than or equal to the threshold value corresponds to the maximum flux value of the second green light flux relative to the cool CCT value and the cool white light. As described with respect to Figure 1 As described, the maximum flux value of the violet flux relative to the cool CCT value and cool white light is the amount of second green flux that results in combined light produced by the combination of the cool white light and the second green light, which has a cool CCT on or near the BBC 102, but not, for example, at the location 130. Relative to the cool CCT value / cool white light, the controller 206 can store in the memory device 208 the maximum flux value of the second green flux and other values ​​of the second green flux, which are determined in the same manner as described above with respect to the violet light emitted by the violet LED 220.

[0054] In some example embodiments, after the value corresponding to the second green flux relative to the warm CCT value / warm white light and / or the value corresponding to the second green flux relative to the cool CCT value / cool white light is stored in the memory device 208, the controller 206 may use the stored values ​​to calculate the value of the second green flux based on the value corresponding to the warm flux. The value or corresponding to the cold flux The value of controls the current flowing through the second green LED 222 to control the total flux of the second green light (i.e., adjust the total flux). Generally, the purple light can have a total flux (i.e., adjust the total flux), which is the sum of (1) a first green flux quantity having a maximum flux value relative to the warm CCT value and the warm white light (i.e., the first adjusted flux quantity) and (2) a second green flux quantity having a maximum flux value relative to the cool CCT value and the cool white light (i.e., the second adjusted flux quantity).

[0055] The controller 206 can control the amount of the flux of the violet light and / or the second green light so that the warm CCT value (e.g., 2700K) of the warm white light emitted by the warm CCT LED 214 is at a position (e.g., position 116) on or otherwise within the Duv threshold of the BBC 102. The controller 206 can also control the amount of the flux of the violet light and / or the second green light so that the cool CCT value (e.g., 6500K) of the cool white light emitted by the cool CCT LED 216 is at a position (e.g., position 118) on or otherwise within the Duv threshold of the BBC 102. In addition to the warm white light, the cool white light, and the green light flux emitted by the green LED 218 having a control based on the lookup table (e.g., Table 1), the controller 206 can also control the amount of the flux of the violet light and / or the second green light so that the cool CCT value (e.g., 6500K) of the cool white light emitted by the cool CCT LED 216 is at a position (e.g., position 118) on or otherwise within the Duv threshold of the BBC 102. In addition to the green light, the controller 206 can also control the amount of flux of the violet light and / or the second green light so that the white light tuning curve of the resulting combined light is closer to the BBC 102 than the white light tuning curves 108, 114, 120.

[0056] In some alternative embodiments, the system 200 may include other components than those shown without departing from the scope of the present disclosure. In some alternative embodiments, the Duv measurement device 224 may be integrated into the lighting device 202. In some alternative embodiments, the lighting device 202 may include components other than those shown without departing from the scope of the present disclosure. In some alternative embodiments, some components of the lighting device 202 may be integrated into a single component or may be connected in a different configuration than that shown without departing from the scope of the present disclosure.

[0057] Figure 3 Picture shows Figure 2 A system 200 including details of a lighting device 202 according to an example embodiment. Figure 1-Figure 3 In some example embodiments, the system 200 includes a lighting device and a Duv measurement device 224. The lighting device 202 may include a driver 204, a controller 206, a memory device 208, an input interface 210, an adjustment input interface 212, and a light module 226. The light module 226 may include a light source unit 312, which includes a warm CCT LED 214, a cold CCT LED 216, a green LED 218, a purple LED 220, and a second green LED 222.

[0058] In some example embodiments, the light module 226 includes a transistor 302 coupled to the purple LED 220, and the controller 206 can control the current flowing through the purple LED 220 by controlling the transistor 302, as can be readily understood by one of ordinary skill in the art having the benefit of the present disclosure. The light module 226 can also include a transistor 304 coupled to the green LED 218 and the second green LED 222, and the controller 206 can control the current flowing through the green LED 218 and the second green LED 222 by controlling the transistor 304, as can be readily understood by one of ordinary skill in the art having the benefit of the present disclosure. The light module 226 can include a transistor 306 coupled to the cold CCT LED 216, and the controller 206 can control the current flowing through the cold CCT LED 216 by controlling the transistor 306, as can be readily understood by one of ordinary skill in the art having the benefit of the present disclosure. The light module 226 may include a transistor 308 coupled to the warm CCT LED 214, and the controller 206 may control the current flowing through the warm CCT LED 214 by controlling the transistor 308, as may be readily appreciated by one of ordinary skill in the art having the benefit of this disclosure.

[0059] In some example embodiments, the light module 226 may include a current sensor 310 that provides an output to the controller 206 indicating an amount of current through the cold CCT LED 216. For example, the controller 206 may use the output of the current sensor 310 and information in a lookup table (e.g., Table 1) and stored information indicating an amount of violet flux and / or an amount of second green flux to control the amount of current through the warm CCT LED 214, the cold CCT LED 216, the green LED 218, the violet LED 220, and the second green LED 222. Alternatively, the current sensor 310 may be coupled to the warm CCT LED 214, and the controller 206 may use the output of the current sensor 310 to control the amount of current through the warm CCT LED 214, the cold CCT LED 216, the green LED 218, the violet LED 220, and the second green LED 222.

[0060] In some alternative embodiments, the light module 226 may include separate transistors for the green LED 218 and the second green LED 222. In some alternative embodiments, the transistors 302, 304, 306, 308 may be omitted without departing from the scope of the present disclosure, and the driver 204 may include separate channels, each coupled to a respective one of the warm CCT LED 214, the cold CCT LED 216, the green LED 218, the violet LED 220, and the second green LED 222.

[0061] Although specific embodiments have been described in detail herein, these descriptions are by way of example. The features of the example embodiments described herein are representative, and in alternative embodiments, certain features, elements, and / or steps may be added or omitted. In addition, those skilled in the art may modify various aspects of the example embodiments described herein without departing from the spirit and scope of the appended claims, the scope of which should be consistent with the broadest interpretation so as to cover modifications and equivalent structures.

Claims

1. A lighting device, comprising: a controller in communication with the memory device; a first light emitting diode (LED) (214) configured to emit warm white light having a warm correlated color temperature (CCT) value; a second LED (216) configured to emit cool white light having a cool CCT value; a green LED (218) configured to emit green light having a green light flux, wherein the green light flux is controlled by a controller based on a flux of cold white light or a flux of warm white light, and wherein a value corresponding to the green light flux is obtained by the controller from a lookup table (Table 1, Table 2) stored in a memory device, the lookup table including a value corresponding to the green light flux and a value corresponding to the flux of cold white light or the flux of warm white light; and A Δu,v (Duv) regulating LED (220, 222) is configured to emit Duv regulating light having a regulated total flux including a regulating flux amount by a controller, wherein the regulating flux amount has a maximum flux value, and the maximum flux value is determined by iteratively adjusting the regulating flux amount when the cold white light and the green light are turned off until the Duv of the combined light (228) including the warm white light and the Duv regulating light is less than a threshold value, wherein after determining the maximum flux value, the regulating flux amount is controlled based on the maximum flux value and based on a value of the flux corresponding to the cold white light or a value of the flux corresponding to the warm white light.

2. The lighting device of claim 1, wherein the combined light (228) has a second warm CCT value, and wherein the warm CCT value and the second warm CCT value are in a seventh-order MacAdam ellipse (122) having a warm CCT center value (116).

3. The lighting device of claim 2, wherein the warm CCT center value (116) is in the range of 2500K to 3000K.

4. The lighting device according to claim 1, wherein the adjusted total flux comprises a second adjusted flux having a second maximum flux value, the second maximum flux value being determined by iteratively adjusting the second adjusted flux amount when the warm white light and the green light are turned off until Duv of a second combined light (228) including the cool white light and the Duv adjusted light is less than a second threshold, and wherein, After determining the second maximum flux value, the second adjustment flux amount is controlled based on the second maximum flux value and based on a value of a flux corresponding to cool white light or a value of a flux corresponding to warm white light.

5. The lighting device of claim 4, wherein the second combined light has a second cold CCT value, and wherein the cold CCT value and the second cold CCT value are in a seventh-order MacAdam ellipse (124) having a cold CCT center value (106).

6. The lighting device according to claim 5, wherein the cold CCT center value (106) is in the range of 6000K to 7000K. The lighting device according to claim 4 , wherein the Duv adjusted light is violet light. The lighting device according to claim 4 , wherein the Duv adjusted light is a second green light.

9. The lighting device according to claim 1, further comprising a second Duv adjusted LED (222, 220) configured to emit a second Duv adjusted light having a second adjusted total flux including a second adjusted flux amount, the second adjusted flux amount having a second maximum flux value, the second maximum flux value being determined by iteratively adjusting the second adjusted flux amount when the warm white light, the green light, and the Duv adjusted light are turned off until the Duv of a second combined light (228) including the cool white light and the Duv adjusted light is less than a second threshold, wherein After determining the second maximum flux value, the second adjustment flux amount is controlled based on the second maximum flux value and based on a value of a flux corresponding to cool white light or a value of a flux corresponding to warm white light.

10. The lighting device of claim 9, wherein the second combined light has a second cold CCT value, and wherein the cold CCT value and the second cold CCT value are in a seventh-order MacAdam ellipse (124) having a cold CCT center value (106).

11. The lighting device of claim 10, wherein the cold CCT center value (106) is in the range of 6000K to 7000K. 12 . The lighting device according to claim 9 , wherein the Duv adjusted light is violet light, and the second Duv adjusted light is second green light. 13 . The lighting device according to claim 9 , wherein the Duv adjusted light is second green light, and the second Duv adjusted light is violet light.

14. The lighting device of claim 1 , wherein the value of the flux corresponding to warm white light and the value of the flux corresponding to cool white light are duty cycle values, normalized flux values, or percentage values ​​relative to a total flux, the total flux being the sum of at least the flux of cool white light and the flux of warm white light.

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