A light fixture mounting assembly that includes a lamp housing having a sidewall and an opening defined by a rim at one end of the sidewall and a detent extending outward from the sidewall in a position to engage an outer surface of a panel when the housing is in an installed position. A lamp module is carried within the lamp housing and comprises a lamp positioned to emit light through the housing opening. The lamp housing is configured to carry either a spring clip-type retainer or a hose clamp-type retainer to hold the lamp housing in the installed position.