Patent ID: 7923934

Claim:
A lamp having a light source, comprising: a base; a power tool battery providing a DC voltage level, the battery releasably connected to the base; a power inverter for converting the DC voltage level to an AC voltage level; a current sensing circuit operatively coupled to a voltage converter and the power inverter; and the current sensing circuit comprising a current sensing device configured to sense an over-current condition when the power inverter draws more than a predetermined amount of current; and the current sensing circuit including a delay circuit positioned along an over-current signal path between the current sensing device and the power inverter, wherein, in response to a sensed over-current condition, the current sensing device outputs an indication of the over-current condition to the delay circuit along the over-current signal path, and the delay circuit delays the indication of the over-current condition such that an over-current signal is output to the power inverter after a predetermined amount or time, and wherein, via the delayed over-current signal, the power inverter is disabled or the DC voltage level is disconnected when the over-current condition continues for more than the predetermined amount of time so that the light source receives the AC voltage level and remains illuminated for the predetermined amount of time before power is removed.