LIGHT AND SYSTEM THAT USES IT

Abstract

Luminaire (14), comprising: an input (38) which can be driven in a first polarity and in a second polarity opposite to the first polarity and which comprises a first and a second supply line (70, 74); a first circuit (42) coupled to the first and second supply lines (70, 74), the first circuit (42) including a first current steering diode (104); a first light source (46) configured to generate visible light within a first wavelength range at a first intensity when the input (38) is driven with the first polarity, and configured to generate visible light within the first wavelength range at a second intensity less than the first intensity when the input (38) is driven with the second polarity, a second circuit (50) coupled to the first and second supply lines (70, 74), the second circuit (50) including a second current steering diode (128); and a second light source (54) configured to generate light within a second wavelength range at a third intensity when the input (38) is driven at the second polarity, and configured to generate light within the second wavelength range at a fourth intensity less than the third intensity when the input (38) is driven at the first polarity, the second wavelength range being different from the first wavelength range; where the first current steering diode (104) is in electrical connection with the first supply line (70) to supply current to the first light source (46) when the input (38) has the first polarity and to block current to the first light source (46) when the input (38) has the second polarity, wherein the first circuit (42) is configured to receive current only when the input (38) is driven in the first polarity, the second current steering diode (128) is in electrical connection with the first supply line (70) to supply current to the second light source (54) when the input (38) has the second polarity and to block current to the second light source (54) when the input (38) has the first polarity, wherein the second circuit (50) is configured to receive current only when the input (38) is driven in the second polarity, and the supply wires (70, 74) simultaneously apply voltage to the first and second circuits (42, 50).

Description

AREA OF REVELATION

[0001] The present disclosure relates to a luminaire for disinfecting a room or objects. The present disclosure further relates to a luminaire for alternatively illuminating a room with a first light source and a second light source. The present disclosure further relates to a system using the luminaires.

[0002] DE 20 2015 100 733 U1 describes a color-tunable LED module with antiparallel LED strings, comprising an LED array and an LED driver that drives the LED array and is configured to output a DC voltage that is switched between two polarities. US 2019 / 0186724 A1 describes an LED light string control system that includes a polarity switching control unit. US 2014 / 0333219 A1 describes a method and apparatus for an LED lighting unit that includes an inverter circuit electrically coupled to an LED module with a pair of antiparallel LED arrays. US 2019 / 0306943 A1 describes a lighting device and a lighting system that may include, among other things, a polarity switching circuit. SUMMARY

[0003] The invention relates to a luminaire according to claim 1 and a system according to claim 8 or 16. Advantageous embodiments are defined in the subclaims.

[0004] Also disclosed is a luminaire including: a voltage input that can be driven in either a first polarity (e.g., straight polarity) or a second polarity (e.g., reversed polarity) opposite to the first polarity; a first light source (e.g., an illuminating light, such as white LEDs) coupled to the voltage input; and a second light source (e.g., a disinfecting light, such as UV-C LEDs) coupled to the voltage input. The first light source is configured to generate visible light at a first intensity when the voltage input is driven in the first polarity and is configured to generate visible light at a second intensity (e.g., zero) less than the first intensity when the voltage input is driven in the second polarity.The second light source is configured to generate invisible light with a third intensity when the voltage input is driven with the second polarity, and is configured to generate invisible light (e.g., UV light) with a fourth intensity (e.g., zero), which is less than the third intensity, when the voltage input is driven with the first polarity.

[0005] Also disclosed is a luminaire including an input operable in a first polarity and a second polarity opposite the first polarity, a first light source coupled to the input, and a second light source coupled to the input. The first light source is configured to generate visible light within a first wavelength range at a first intensity when the input is operated in the first polarity, and is configured to generate visible light within the first wavelength range at a second intensity less than the first intensity when the input is operated in the second polarity.The second light source is configured to generate light within a second wavelength range at a third intensity when the input is driven with the second polarity, and is configured to generate light within the second wavelength range at a fourth intensity that is less than the third intensity when the input is driven with the first polarity. The second wavelength range differs from the first wavelength range.

[0006] Also disclosed is a system including a power source and a controller coupled to the power source and capable of switching a polarity of the power source from a first polarity to a second polarity opposite the first polarity. The system further includes an input coupled to the power source via the controller, a first light source coupled to the input, and a second light source coupled to the input. The first light source is configured to produce visible light within a first wavelength range at a first intensity when the input is driven at the first polarity and is configured to produce visible light within the first wavelength range at a second intensity less than the first intensity when the input is driven at the second polarity.The second light source is configured to generate light within a second wavelength range at a third intensity when the input is driven with the second polarity, and is configured to generate light within the second wavelength range at a fourth intensity less than the third intensity when the input is driven with the first polarity. The second wavelength range differs from the first wavelength range.

[0007] Also disclosed is a system including a power source, a controller coupled to the power source and capable of switching a polarity of the power source from a first polarity to a second polarity opposite the first polarity, and a light fixture. The controller is a constant current driver. The light fixture includes an input coupled to the power source via the controller, a first light source coupled to the input, and a second light source coupled to the input. The first light source is configured to produce visible white light at a first intensity when the input is driven at the first polarity and is configured to produce visible white light at a second intensity less than the first intensity when the input is driven at the second polarity.The second light source is configured to generate non-visible light and visible non-white light with a third intensity when the input is driven with the second polarity. The second light source is configured to generate non-visible light and visible non-white light with a fourth intensity, which is lower than the third intensity, when the input is driven with the first polarity.

[0008] One way to achieve this is to provide the luminaire with a first current steering diode and a second current steering diode. The first current steering diode may be arranged to supply current to the first light source when the first polarity is applied to the voltage input and to block current to the first light source when the second polarity is applied to the voltage input. The second current steering diode may be arranged to supply current to the second light source when the second polarity is applied to the voltage input and to block current to the second light source when the first polarity is applied to the voltage input.

[0009] The previously described luminaire can be used with a single power source, a single control coupled to the power source, and a single associated wiring, eliminating the need for multiple wiring systems. The control can switch the polarity of the power source from the first to the second polarity.

[0010] Other aspects of the disclosure will become apparent from the detailed description and the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1A is a schematic of a system including a remote driver having a configuration and a luminaire having a first light source and a second light source, according to one embodiment. Fig. 1B is a schematic of a system according to another embodiment that includes the remote driver from Fig. 1A and a luminaire with a first light source and a second light source. Fig. 2A is a schematic of a system according to another embodiment including a remote driver having another configuration and a luminaire having a first light source and a second light source. Fig. 2B is a schematic of a system according to another embodiment including the remote driver from Fig. 2A and a luminaire with a first light source and a second light source. Fig. Figure 2C is a schematic representation of part of the systems from Fig. 2A and Fig. 2B. Fig. 3 is a schematic representation of the second light source of Fig. 1A-2B. Fig. 4A is a schematic representation of several luminaires from Fig. 1A, Fig. 1B, Fig. 2A or Fig. 2B, with each other and with the remote driver of a Fig. 1 or Fig. 2C electrically coupled. Fig. 4B is a schematic representation of several luminaires from Fig. 1A, Fig. 1B, Fig. 2A or Fig. 2B, electrically coupled to each other and to a remote driver with yet another configuration. DETAILED DESCRIPTION

[0011] Before any aspects of the disclosure are explained in detail, it is to be understood that the disclosure is not limited in its application to the details of construction and arrangement of components set forth in the following description or illustrated in the following drawings. The disclosure may support other aspects and may be practiced or carried out in various ways. It is also to be understood that the phraseology and terminology used herein are for the purpose of description and should not be considered limiting.

[0012] Fig. 1A schematically illustrates a system 10 according to a system comprising a lamp 14, a switch 18, a power source 22 in electrical communication with the lamp 14, a buck converter 26 in electrical communication with the power source 22, and a controller in the form of a remote driver 30 in communication with the power source 22. As shown in the Fig. 4A and Fig. 4B, the system 10 may include multiple lights 14 coupled together in parallel or in series, as discussed in more detail below.

[0013] Fig. Figure 2A schematically illustrates a system 10' according to another embodiment, comprising the luminaire 14, the power source 22 in electrical communication with the luminaire 14, and a controller in the form of a remote driver 30' in communication with the power source 22. The driver 30' is described in more detail in Fig. 2B, which illustrates the buck converter 26 as an element of the driver 30'. The power source 22 is in electrical communication with the buck converter 26 of the driver 30'.

[0014] Regardless of the embodiment, the luminaire 14 is designed to be located in an enclosed area 34 (e.g., a room). The illustrated power source 22 converts alternating current to direct current (e.g., an AC / DC converter) and therefore supplies direct current to the system 10, 10'. In other embodiments, the power source may be a direct current source, an alternating current source, or another suitable power source.

[0015] The illustrated driver 30, 30' is used to switch the polarity of the power source 22. In the illustrated embodiments, the drivers 30, 30' may include a relay switch 36 ( Fig. 2A) that switches the polarity of the power source 22 based on instructions received from a processor 37. In other embodiments, the polarity may be switched in any other suitable manner (e.g., may be switched between straight polarity and reverse polarity).

[0016] The switch 18 can be directly electrically connected to the lamp 14 ( Fig. 1A) or via the power source 22 and the driver 30' ( Fig. 2A) may be in electrical communication with the light fixture 14. In still some embodiments, the switch 18 may be incorporated into the light fixture 14. The switch 18 is configured to instruct the driver 30, 30' (via the relay 36 and the processor 37) to switch the polarity, as explained in more detail below. In some embodiments, the switch 18 may be an occupancy sensor configured to detect motion or infrared radiation to detect the presence of a person located within the enclosed area 34. In other embodiments, a physical switch 18 may be used instead of the sensor.

[0017] The luminaire 14 includes an input 38, a first circuit 42, a first light source 46, a second circuit 50, and a second light source 54. The first circuit 42 and the second circuit 50 are in simultaneous communication with the power source 22 via the input 38. In the illustrated embodiment, the input 38 includes a first input wire 70 and a second input wire 74. In addition, the remote driver 30, 30' and the buck converter 26 are in electrical communication between the power source 22 and the first and second circuits 42, 50 via the input 38. As previously mentioned, the input 38 can be driven in either a first polarity (e.g., a straight polarity) or a second polarity (e.g., a reverse polarity) opposite the first polarity via the remote driver 30, 30' and the buck converter 26.

[0018] With regard to the embodiments of the Fig. 1A and Fig. 2A, the first circuit 42 includes a first steering diode 104 and the second circuit 50 includes a second steering diode 128. The steering diodes 104, 128 in the first and second circuits 42, 50 limit the current flow in one direction within the circuit. The first circuit 42 only has current when the first polarity is applied to the current source 22, and the second circuit 50 only has current when the second polarity is applied to the current source. In an alternative embodiment, instead of stopping the current flow in the first circuit when the second polarity is applied, the first circuit could allow a smaller amount of current to flow. The same applies to the second circuit when the first polarity is applied. As in the alternative embodiments of the Fig. 1B and Fig. 2B, it is contemplated that the first circuit 42 may include two first steering diodes 104, 108 and the second circuit 50 may include two second steering diodes 124, 128.

[0019] In the illustrated embodiment, the first light source 46 includes light-emitting diodes (LEDs) that emit visible light, such as white LEDs (e.g., LEDs with a wavelength of 390-700 nm). In the illustrated embodiment, there are three LEDs, but in other embodiments, any suitable number of visible light LEDs may be present. In use, the white LEDs emit white or visible light to illuminate the enclosed area 34. In the illustrated embodiment (as shown in Fig. 3), the second light source 54 includes LEDs 54a that emit non-visible or disinfecting light, such as ultraviolet (UV) LEDs (e.g., LEDs in the UV-C band with a wavelength of 100-280 nm) and an LED 54b that emits colored or non-white visible light (e.g., a red LED). In use, the UV LEDs 54a are used to disinfect the enclosed area 34, and the red LED 54b is used to alert people that the UV LEDs are operating. In the illustrated embodiment, the LED 54b that emits non-white visible light is a flashing light. That is, the LED 54b emits non-white visible light in a repeating pattern to alert people that the UV LEDs are operating and emitting non-visible light. In other embodiments, the second light source 54 may contain only UV LEDs that emit non-visible light.In still other embodiments, the second light source 54 may only include LEDs that emit visible light, such as one or more blue LEDs (e.g., LEDs with a wavelength of 450-465 nm). However, the light sources 46, 54 may include LEDs with any suitable color combination. For example, the first light source 46 may include red LEDs, and the second light source 54 may include blue LEDs. In another example, the first light source 46 may include white LEDs, and the second light source 54 may include red or amber LEDs.

[0020] In the illustrated embodiments, each of the drivers 30, 30' is a constant current driver. Accordingly, the buck converter 26 is configured to receive voltage from the power source and regulate the current flow such that an operating current (e.g., 700 mA) is supplied to the first circuit 42 or, alternatively, to the second circuit 50 to selectively power the first light source 46 or the second light source 54, respectively, based on whether the remote driver 30, 30' is set to the first polarity or the second polarity. The buck converter 26 thus regulates the current from the power source 22 to the first light source 46 and to the second light source 54. Multiple luminaires 14 can be connected in series and controlled by the constant current drive card 30, 30', as shown in Fig. 4A. The remote driver 30, 30' may also be configured to dim the first and second light sources 46, 54. That is, the driver 30, 30' varies the current either by the amplitude or duty cycle of a pulse-width modulated (PWM) voltage, and the respective light source 46, 54 is dimmed directly by this signal.

[0021] In the illustrated embodiments, when relay 36 of remote driver 30, 30' is set (e.g., via relay 36) to the first (e.g., even) polarity, the operating current from power source 22 flows through first circuit 42 and powers first light source 46. That is, current flows toward first steering diode 104 of first circuit 42 and is prevented from flowing against the direction of second steering diode 128 of second circuit 50. Accordingly, first light source 46 is powered, but second light source 54 is not powered. Accordingly, in the illustrated embodiment, visible light (e.g., white light) illuminates enclosed area 34 because first light source 46 is powered, but the disinfection light and non-white visible light are not emitted by second light source 54.

[0022] When the remote driver 30, 30' is set (e.g., via relay 36) to the second (e.g., reversed) polarity, the operating current from the power source 22 flows through the second circuit 50 and powers the second light source 54. That is, current flows toward the second steering diodes 128 of the second circuit 50 and is prevented from flowing against the direction of the first steering diode 104 of the first circuit 42. Accordingly, the second light source 54 is powered, but the first light source 46 is not powered. In the illustrated embodiment, when the second light source 54 is powered, disinfecting light (e.g., UV light) disinfects the enclosed area 34, and non-white visible light is also emitted to provide people with a visual indication that the UV light is on. However, white visible light is not emitted from the first light source 46.

[0023] In other embodiments, each of the drivers 30" may be a constant voltage driver. In this case, the luminaire 14 further includes a constant current driver 30, 30' that regulates the current from the remote constant voltage driver 30" to the first and second light sources 46, 54. If a constant current driver 30", multiple luminaires 14 may be connected in parallel, as in Fig. 4B. However, as previously mentioned, each luminaire 14 also requires its own driver 30, 30'. The remote driver 30" may also be configured to dim the first and second light sources 46, 54. That is, the driver 30, 30' varies the duty cycle of a PWM voltage, and the luminaire driver 30, 30' converts the PWM voltage into a constant current to control or dim the respective light source 46, 54.

[0024] In the embodiments with the constant voltage driver 30", the operating voltage flows to the driver 30, 30' of the light fixture 14 when the driver 30" is set to the first (e.g., even) polarity. Accordingly, the driver 30, 30' of each light fixture 14 converts the operating voltage from the constant voltage driver 30" into the appropriate operating current and supplies the appropriate operating current through the first circuit 42 to power the first light source 46. That is, as previously discussed, current flows toward the first steering diode 128 of the first circuit 42 and is prevented from flowing against the direction of the second steering diode 104 of the second circuit 50.

[0025] In the embodiments with the constant voltage driver 30", the operating voltage flows to the driver 30, 30' of the light fixture 14 when the driver 30" is set to the second (e.g., reversed) polarity. Accordingly, the driver 30, 30' of each light fixture 14 converts the operating voltage from the constant voltage driver 30" into the appropriate operating current and supplies the appropriate operating current through the second circuit 50 to power the second light source 54. That is, current flows toward the second steering diode 128 of the second circuit 50 and is prevented from flowing against the direction of the first steering diode 104 of the first circuit 42.

[0026] In use, the light 14 is configured to be disposed within the enclosed area 34 and electrically coupled to the switch 18 and the power source 22. When white visible light is to illuminate the enclosed area 34, the switch 18 is in a first operating state that sets the driver 30, 30', 30" (via the relay 36 and the processor 37) to instruct the power source 22 to drive the light with the first polarity, such that the light 14 emits white light via the first light source 46 to illuminate the enclosed area 34, as previously discussed. In this configuration, the second light source 54 cannot illuminate because the second circuit 50 is blocked by the second steering diode 128.When disinfecting light, non-white visible light, or both are to illuminate the enclosed area 34, the switch 18 is in a second operating state that sets the remote driver 30, 30', 30" (via the relay 36 and the processor 37) to reverse the polarity of the power source 22. As a result, the current to the first light source 46 is blocked by the first and second steering diodes 104 of the first circuit 42, and the current to the second light source 54 is then initiated such that the luminaire 14 emits light via the second light source 54 to disinfect the enclosed area 34 and / or emit a non-white visible light therein, as previously discussed.

[0027] If the switch 18 is a sensor, the sensor 18 detects the presence (e.g., by motion or infrared radiation) of the person, thereby setting the driver 30, 30', 30" to instruct the power source 22 to drive the light with the first polarity, as previously discussed. When the person leaves the enclosed area 34, the sensor 18 detects the absence of the person (e.g., by lack of motion or infrared radiation), and the remote driver 30 reverses the polarity of the power source 22, as previously discussed. When a person subsequently enters the enclosed area 34, the sensor 18 detects the presence of the person, and the remote driver 30 instructs the power source 22 to return to the first polarity to block the second light source 54 and power the first light source 46.

[0028] The luminaire 14 of the present disclosure uses two light sources 46, 54 (e.g., the white LEDs and UV LEDs) with a single power source 22 (i.e., lead and neutral wires) and with a single driver 30, which is advantageous over devices where two light sources require separate power sources, switches, data cables, and / or drivers.

[0029] Furthermore, in embodiments where the second light source is a disinfection light source, the likelihood of a person being exposed to UV light is reduced because the first and second light sources 46, 54 cannot be operated simultaneously. If the white light is visible in an enclosed space, a person can know that the enclosed area is not being disinfected and they will not be exposed to the UV LEDs.

[0030] Although the disclosure has been described in detail with reference to certain preferred aspects, variations and modifications are possible within the scope and spirit of one or more independent aspects of the disclosure as described.

Claims

[1] Lamp (14), comprising: an input (38) which can be driven in a first polarity and in a second polarity which is opposite to the first polarity and which comprises a first and a second supply line (70, 74); a first circuit (42) coupled to the first and second supply lines (70, 74), the first circuit (42) including a first current steering diode (104); a first light source (46) configured to generate visible light within a first wavelength range at a first intensity when the input (38) is driven with the first polarity, and configured to generate visible light within the first wavelength range at a second intensity less than the first intensity when the input (38) is driven with the second polarity, a second circuit (50) coupled to the first and second supply lines (70, 74), the second circuit (50) including a second current steering diode (128); and a second light source (54) configured to generate light within a second wavelength range at a third intensity when the input (38) is driven at the second polarity, and configured to generate light within the second wavelength range at a fourth intensity less than the third intensity when the input (38) is driven at the first polarity, the second wavelength range being different from the first wavelength range; where the first current steering diode (104) is in electrical connection with the first supply line (70) to supply current to the first light source (46) when the input (38) has the first polarity and to block current to the first light source (46) when the input (38) has the second polarity, wherein the first circuit (42) is configured to receive current only when the input (38) is driven in the first polarity, the second current steering diode (128) is in electrical connection with the first supply line (70) to supply current to the second light source (54) when the input (38) has the second polarity and to block current to the second light source (54) when the input (38) has the first polarity, wherein the second circuit (50) is configured to receive current only when the input (38) is driven in the second polarity, and the supply wires (70, 74) simultaneously apply voltage to the first and second circuits (42, 50). [2] The luminaire (14) of claim 1, wherein the first light source (46) includes one or more white LEDs and the second light source (54) includes one or more UV LEDs. [3] The luminaire (14) of claim 2, wherein the second light source (54) further includes one or more colored LEDs (54b). [4] The luminaire (14) of claim 1, wherein the second and fourth intensities are substantially zero. [5] The luminaire (14) of claim 1, wherein the second light source (54) is configured to generate non-visible light. [6] The luminaire (14) of claim 1, wherein the second light source (54) is configured to generate visible light. [7] The luminaire (14) of claim 1, wherein the second light source (54) is configured to generate non-visible light and visible light. [8] System comprising: a power source (22); a controller (30) coupled to the power source (22) and capable of switching a polarity of the power source (22) from a first polarity to a second polarity opposite the first polarity; and an input (38) in communication with the power source (22) via the controller (30), the input comprising a first and a second supply line (70, 74); a first circuit (42) coupled to the first and second supply lines (70, 74), the first circuit (42) including a first current steering diode (104); a first light source (46) configured to produce visible light within a first wavelength range at a first intensity when the input (38) is driven at the first polarity, and configured to produce visible light within the first wavelength range at a second intensity less than the first intensity when the input (38) is driven at the second polarity; a second circuit (50) coupled to the first and second supply lines (70, 74), the second circuit (50) including a second current steering diode (128); and a second light source (54) configured to generate light within a second wavelength range at a third intensity when the input (38) is driven with the second polarity, and configured to generate light within the second wavelength range at a fourth intensity less than the third intensity when the input (38) is driven with the first polarity, wherein the second wavelength range differs from the first wavelength range, where the first current steering diode (104) is in electrical connection with the first supply line (70) to supply current to the first light source (46) when the input (38) has the first polarity and to block current to the first light source (46) when the input (38) has the second polarity, wherein the first circuit (42) is configured to receive current only when the input (38) is driven in the first polarity, and the second current steering diode (128) is in electrical connection with the first supply line (70) to supply current to the second light source (54) when the input (38) has the second polarity and to block current to the second light source (54) when the input (38) has the first polarity, wherein the second circuit (50) is configured to receive current only when the input (38) is driven in the second polarity, and the supply wires (70, 74) simultaneously apply voltage to the first and second circuits (42, 50). [9] The system of claim 8, further comprising a sensor (18) in communication with the controller (30), wherein the controller (30) receives information from the occupancy sensor (18) to control the polarity of the power source (22). [10] The system of claim 8, wherein the first light source (46) includes one or more white LEDs and the second light source (54) includes one or more UV LEDs (54a). [11] The system of claim 10, wherein the second light source (54) further includes one or more colored LEDs (54b). [12] The system of claim 8, wherein the second and fourth intensities are substantially zero. [13] The system of claim 8, wherein the controller (30) is a constant current driver (30, 30'). [14] The system of claim 8, wherein the controller (30) is a constant voltage driver (30") and the luminaire (14) further includes a constant current driver (30, 30') in communication with the constant voltage driver (30") and the input (38). [15] The system of claim 8, wherein a first light source (46) is configured to produce visible light within the first wavelength range at a fifth intensity when the input (38) is driven at the first polarity, the fifth intensity being less than the first intensity but greater than the second intensity. [16] System comprising: a power source (22); a controller (30) coupled to the power source (22) and capable of switching a polarity of the power source (22) from a first polarity to a second polarity opposite the first polarity, the controller (30) being a constant current driver; and several luminaires (14) which are electrically connected in series, each luminaire containing an input (38) in communication with the power source (22) via the controller (30), the input comprising a first and a second supply line (70, 74); a first circuit (42) coupled to the first and second supply lines (70, 74), the first circuit (42) including a first current steering diode (104); a first light source (46) configured to generate visible white light having a first intensity when the input (38) is driven with the first polarity, and configured to generate visible white light having a second intensity less than the first intensity when the input (38) is driven with the second polarity; a second circuit (50) coupled to the first and second supply lines (70, 74), the second circuit (50) including a second current steering diode (128); and a second light source (54) coupled to the input (38), wherein the second light source (54) is configured to generate non-visible light and visible non-white light having a third intensity when the input (38) is driven with the second polarity, wherein the second light source (54) is configured to generate non-visible light and visible non-white light having a fourth intensity that is less than the third intensity when the input (38) is driven with the first polarity, wherein the first current steering diode (104) is in electrical connection with the first supply line (70) to supply current to the first light source (46) when the input (38) has the first polarity and to block current to the first light source (46) when the input (38) has the second polarity, wherein the first circuit (42) is configured to receive current only when the input (38) is driven in the first polarity, and the second current steering diode (128) is in electrical connection with the first supply line (70) to supply current to the second light source (54) when the input (38) has the second polarity and to block current to the second light source (54) when the input (38) has the first polarity, wherein the second circuit (50) is configured to receive current only when the input (38) is driven in the second polarity, and the supply wires (70, 74) simultaneously apply voltage to the first and second circuits (42, 50). [17] The system of claim 16, further comprising a processor (37) and a relay switch, wherein the relay switch is configured to switch the polarity of the power source (22) from the first polarity to the second polarity, which is reversed from the first polarity, based on instructions from the processor (37). [18] Luminaire according to claim 1, wherein the first circuit (42) comprises a positive terminal in electrical connection with the first supply line (70) and the first light source (46) and a negative terminal in electrical connection with the second supply line (74) and the first light source (46), the second circuit (50) comprises a positive terminal in electrical connection with the second supply line (74) and the second light source (54) and a negative terminal in electrical connection with the first supply line (70) and the second light source (54), and the first supply line (70) is located between the positive terminal of the first circuit (42) and the negative terminal of the second circuit (50). [19] The luminaire of claim 18, wherein the first current steering diode (104) is in electrical connection with the positive terminal of the first circuit (42) and the second current steering diode (128) is in electrical connection with a negative terminal of the second circuit (50). [20] The luminaire of claim 19, wherein the first current steering diode (104) is forward biased from the first supply line (70) to the positive terminal of the first circuit (42) and the second current steering diode (128) is forward biased from the negative terminal of the second circuit (50) to the second supply line (74).

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