A portable lighting apparatus including a lamp assembly that is adjustably adapted to be suspended from and secured to the side rails of a livestock grooming stand or chute, or alternately to an articulated lamp stand, to shed diffused light downward on an animal occupying the grooming stand or chute. The lamp assembly includes a rigid housing in which is received a weatherproof lighting fixture and an adjustable bracket mechanism for suspending the assembly from the side rails or lamp stand. The lamp stand includes a position-adjustable hangar assembly for supporting the lamp assembly, a base, and a set of support arms that can be collapsed to a transport position for ease of transport and storage.
