Abstract: This invention relates to an auxiliary light for vehicles and in particular to one including a housing having a generally rectangular open end, a mounting having a bottom plate adapted to be received in the housing, a bulb mounted on a conducting rectangular stand, a holder formed of the rear portion with two prongs separated by a distance wider than a narrower side of the stand, a light concentrator for concentrating the light from the bulb to the reflective wall of the housing, a rubber seal disposed in the housing for preventing water from entering therein, a transparent shade fitted into the housing, a frame engaged with the open end of the housing and a movable colored cover pivotally mounted on the frame, whereby the invention can be easily assembled without using screws, rivets or any other tools and can be used as both an auxiliary light and a fog light.