Patent ID: 7682048
Filing Date: 2010-03-23
Classification: F21K,F21V,F21Y,H01L

Abstract:
1. A light emitting diode lamp, comprising: a circuit board which has a first surface and a second surface at opposite sides thereof, the first surface facing a first direction, the second surface facing a second direction substantially opposite to the first direction; a first light emitting diode array and a second light emitting diode array being arranged on the first surface of the circuit board in a juxtaposed manner, the first and second light emitting diode arrays electrically connected with and thermally attached to the first surface of the circuit board, a ratio of change of luminous intensity relative to change of temperature of the first light emitting diode array being less than that of the second light emitting diode array; a first heat sink thermally attached to the second surface of the circuit board and positioned corresponding to the first light emitting diode array; and a second heat sink thermally attached to the second surface of the circuit board and positioned corresponding to the second light emitting diode array, the first and second heat sinks being juxtaposed at the second surface of the circuit board, a heat dissipation efficiency of the second heat sink being greater than that of the first heat sink.