Patent ID: 7481554

Claim:
An LED lamp apparatus comprising a plurality of light emitting diodes arranged in a lighting array; a substantially opaque shade assembly defining an enclosure with an open side, the lighting array received within the enclosure with the plurality of light emitting diodes facing outwardly through the open side; and a power pack assembly electrically operably connected with the plurality of light emitting diodes to provide power for selectively illuminating the plurality of light emitting diodes, the power pack assembly including a battery, a regulator circuit and a current monitoring circuit, the battery electrically operably coupled with the plurality of light emitting diodes, the regulator circuit, and the current monitoring circuit, wherein the current monitoring circuit monitors a magnitude of electrical current flowing through the plurality of light emitting diodes and communicates a signal indicative of the magnitude of electrical current to the regulator circuit, and wherein the regulator circuit adjusts a magnitude of drive voltage applied to the plurality of light emitting diodes based on the signal such tht a magnitude of light energy emitted frrom the plurality of light emitting diodes is maintained substantially constant as the battery is discharged.