LED luminaire including a thin phosphor layer applied to a remote reflector

A light fixture comprising:

• a reflector disposed to reflect light and direct light out of the light fixture;
• a plurality of GaN LED devices to produce the light, at least some of the plurality of GaN devices mounted on a surface to face the reflector;
• a phosphor applied to the reflector to provide wavelength conversion for at least a portion of the light from the plurality of GaN LED devices;
• and
• a diffuser lens assembly through which light exits the light fixture, the diffuser lens assembly disposed at the sides of the surface;
• wherein the surface faces a center region of the reflector to which the phosphor is applied so that the light fixture emits light through the diffuser lens assembly.

A method of assembling a light fixture, the method comprising:

• providing a housing including a reflector;
• coating the reflector with a phosphor to a thickness of from 5 to 50 μm;
• installing a plurality of GaN LEDs on a mounting surface of a heatsink wherein the mounting surface faces a center region of the reflector coated with the phosphor so that light from the plurality of GaN LEDs impinges on the reflector with the phosphor;
• and
• positioning a diffuser lens assembly adjacent to the heatsink so that light from the plurality of GaN LEDs is reflected from the reflector with the phosphor and leaves the light fixture through the diffuser lens assembly.

A lighting system comprising:

• an LED on a mounting surface;
• and
• a layer of remote phosphor between 5 and 50 μm thick;
• wherein the LED and the remote phosphor are selected and positioned with the mounting surface facing a central region of the remote phosphor so that indirect light is provided and is emitted from the lighting system through a diffuser lens assembly disposed at the sides of the mounting surface adjacent to the LED.