LED downlight

摘要

A lighting device includes a substrate, a light emitting diode (LED) array mounted on a first surface of the substrate, and circuit components mounted on the first surface of the substrate and coupled to the LED array wherein the circuit components are adapted to control electrical power applied to the LED array. A heat exchanger is mounted on a second surface of the substrate and a reflector is disposed about the LED array wherein the reflector has a reflection surface that is convex on a first side of an inflection locus and concave on a second side of the inflection locus, and wherein the first side of the inflection locus is proximate the LED array. A diffuser is adjacent the second side of the inflection locus of the reflector.

主权项

1. A lighting device, comprising:
a light emitting diode (LED); a heat exchanger with which the LED is disposed in heat transfer relationship; a reflector having a proximal end disposed about the LED; a driver circuit disposed on a substrate for operating the LED wherein the driver circuit is adapted to be directly connected to an alternating current (AC) power source; a diffuser disposed on a distal end of the reflector; and a mounting collar for maintaining the heat exchanger, the LED, the reflector, and the diffuser in assembled relationship; wherein a profile to lumen ratio of the entire lighting device is one of no greater than about 1.2 cm2 per lumen (0.2 in2 per lumen), between about 0.03 cm2 per lumen (0.005 in2 per lumen) and about 1.2 cm2 per lumen (0.2 in2 per lumen), and between about 0.05 cm2 per lumen (0.008 in2 per lumen) and about 0.7 cm2 per lumen (0.1 in2 per lumen), and wherein the lighting device has a weight to lumen ratio of no greater than about 2.5 g per lumen (0.09 oz per lumen).