Abstract: A warning light adapted for mounting to an overhead rack of a vehicle has a housing which through one end forms a throat configured to receive an end of a tubular rack member. The housing includes a pair of shell members which cooperate to define the throat and openings for the first, second and third light units. The throat has a geometry which is generally complementary to the geometry of the profile of the tubular member. The shell members are configured to capture the light units for proper positioning. An upper portion of the housing allows access to an upper track of the tubular rack member. The light units are arranged to produce an illumination pattern visible from the front, side and rear of the vehicle. Preferably the first, second and third light units are substantially identical units which employ LEDs.