Patent ID: 8240875
Filing Date: 2012-08-14
Classification: F21S,F21V,F21Y

Abstract:
1. An illumination module, comprising: a longitudinal support member including a base portion and a pair of sidewalls extending from the base portion, the base portion and the pair of sidewalls defining a channel that extends in a longitudinal direction parallel to the sidewalls; a printed circuit board (PCB) on the base portion of the support member and extending in the longitudinal direction within the channel; a plurality of light emitting diodes (LEDs) mounted on the PCB and arranged in an array extending in the longitudinal direction; a reflective sheet within the channel and extending across the channel between the pair of sidewalls, wherein the PCB is between the reflective sheet and the base portion of the support member, wherein the reflective sheet includes a plurality of holes therein that are arranged to correspond with locations of the LEDs on the PCB, and wherein the LEDs are at least partially positioned within the holes; and an optical film positioned in the channel and extending across the channel between the pair of sidewalls and defining an optical cavity between the reflective sheet and the optical film into which light is emitted by the LEDs, wherein the optical film, the reflective sheet and the sidewalls of the support member are configured to recycle light in the optical cavity by reflecting some light emitted by the LEDs back into the optical cavity and transmitting some light emitted by the LEDs out of the optical cavity wherein the plurality of LEDs comprises a pair of LEDs each having a chromaticity that is within about a seven step Macadam ellipse about a point on a blackbody radiation curve on a 1931 CIE chromaticity space from a correlated color temperature of 2500K to 8000K˜ and wherein the pair of LEDs have different optical characteristics, wherein said pair of LEDs is a metameric pair and wherein chromaticities of the LEDs of the metameric pair are selected so that a combined light generated by a mixture of light from each of the LEDs of the metameric pair comprises light having about a target chromaticity.