Mobile lighting fixture, method and boom

Abstract

A mobile lighting unit which includes a plurality of lighting fixtures, each utilizing high-wattage, high-intensity lamps. The fixtures comprise a socket and hemispherical reflector assembly which are vertically and horizontally adjustably mounted to a lighting rack by an adjustable elbow member. The lamps are positioned in said fixtures so that their longitudinal axis is parallel to the light beam formed by the reflector, requiring one end of the lamp to be inserted in the socket and the other end to extend to the center of the hemispherical reflector. The lamps are cooled by pressurized air produced by a fan and transported through air tight channels in the lighting rack. The lamps are shock-dampened by mounting their socket end to a metal spring located on the interior wall of the socket and by attaching wires to the front end of the lamp, which are in turn attached to metal springs on the interior surface of the reflector. Thus, the lamp is fully shock absorber protected. The lighting rack holding the plurality of fixtures is hingedly attached to a special V-shaped boom jib which allows the rack to be tilted downward by means of a remotely controlled hydraulic cylinder without interference with the boom. The boom jib is attached to a boom which is an extensible and collapsible mast, which in turn is adjustably mounted on a mobile platform.