LED luminaire
AssigneeKoninklijke Philips Electronics N.V.
InventorsDavid W. Knoble, Khosrow Jamasbi
Life of this patent
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Abstract
A LED luminaire comprises a heat sink disposed above an LED array and in thermal communication with the LED array, the LED array having at least one red LED and a plurality of cool white LEDs, the at least one red LED providing a warmer correlated color temperature for an output light and the plurality of white LEDs providing a higher efficacy, a diffuser positioned to enclose the LED array between the heat sink and the diffuser, the diffuser color mixing the at least one red LED and the plurality of cool white LEDs rendering a red light from the at least one red LED indiscernible from a cool white light of the plurality of white LEDs, a reflector positioned adjacent the heat sink.
Claims18
An LED luminaire, comprising:
- a luminaire housing;
- a heat sink positioned adjacent said reflector;
- an LED array positioned adjacent and in thermal communication with said heat sink, said LED array having a plurality of cool white LEDs and at least one red LED to provide a warmer correlated color temperature at cooler operating temperature;
- a single reflector, positioned to reflect light from each of said LEDs in said array, and being one of integral with or depending from said housing;
- a diffuser for mixing the cool white LED light and the at least one red LED light, said diffuser inhibiting independent viewing of said at least one red LED.
An LED luminaire, comprising:
- a heat sink disposed above an LED array and in thermal communication with said LED array;
- said LED array having at least one red LED and a plurality of cool white LEDs, said at least one red LED providing a warmer correlated color temperature for an output light and said plurality of white LEDs providing a higher efficacy;
- a diffuser positioned to enclose said LED array between said heat sink and said diffuser;
- said diffuser color mixing said at least one red LED and said plurality of cool white LEDs rendering a red light from said at least one red LED indiscernible from a cool white light of said plurality of white LEDs;
- a single reflector, positioned to reflect light from each of said LEDs in said array, and positioned adjacent said heat sink.
An LED luminaire, comprising:
- an upper housing;
- an LED array positioned within said upper housing;
- a heat sink in thermal communication with said LED array;
- said LED array having at least one red LED and a plurality of cool white LEDs;
- a single reflector, positioned to reflect light from each of said LEDs in said array;
- a diffuser disposed at least in part beneath said reflector;
- said diffuser mixing the light emitted from said LEDs rendering red light emitted from said at least one red LED discernable from white light emitted from said plurality of cool white lights.
An LED luminaire comprising:
- a circuit board;
- a plurality of cool white light emitting diodes and at least one red light emitting diode, each of said cool white light emitting diodes and said at least one red light emitting diode coupled to said circuit board;
- a translucent diffuser disposed about said circuit board thereby encompassing each of said light emitting diodes;
- a reflector surrounding said translucent diffuser;
- wherein the circuit board comprises a greater number of cool white LEDs than red LEDs;
- and,
- wherein a light output is warmer than a cool white light and has a correlated color temperature of between about 2,500 to about 3,900 Kelvin (K).
Dependencies are inferred from the claim text.