Heat sensitive pool light

Claim 1

In a light assembly adapted to illuminate liquid below a liquid surface, the combination that comprises, (a) a lamp unit including a metallic housing adapted to be cooled by heat transfer to the liquid, a lamp socket, and lamp circuitry, (b) a thermostat coupled to the lamp circuitry to control electrical energization of the lamp, and (c) an enlongated, substantially flat and heat conductive metallic strip associated with said housing and thermostat to become increasingly heated for changing the conductive state of the lamp in response to diminished cooling of the housing by said liquid, (d) the metallic strip being located at the inner side of said housing and in heat transfer relation with said inner side along the strip length, the outer side of the housing adapted to be contacted by liquid, (e) the thermostat located proximate a portion of the strip near the lamp socket, (f) the strip consisting of an elongated and good heat conducting metal extending upwardly and along the slant height dimension of said housing which is frusto-conical, and away from the thermostat.