Patent ID: 8253336
Filing Date: 2012-08-28
Classification: F21K,F21V,F21Y

Abstract:
1. A biologically-corrected LED lamp, having a color rendering index above 70 and a color temperature between about 2,700 K and about 3,500 K, wherein the lamp produces a spectral power distribution that increases spectral opponency to thereby minimize melatonin suppression, comprising: a base; a housing attached to the base; a power circuit disposed within the housing and having electrical leads attached to the base; a driver circuit disposed within the housing and electrically coupled to the power circuit; a heat sink disposed about the housing; a plurality of LED chips electrically coupled to and driven by the driver circuit, wherein the plurality of LED chips are coupled to the heat sink, wherein the plurality of LED chips are blue-pumped white LED chips that produce light having a color temperature of about 2,700 K, and wherein the drive circuit is configured to drive the plurality of LED chips with a ripple current at frequencies greater than 200 Hz; and an optic diffusing element mounted on the heat sink and surrounding the plurality of LED chips, wherein the optic diffusing element has a color filter applied thereto, and wherein the color filter is configured to increase spectral opponency to thereby decrease a melatonin suppressive effect of a light output from the plurality of LED chips.