Methods and apparatuses provide a supplemental light source, such as a strobe light, for a motor vehicle. An adapter may be provided to mount a supplemental light source to an existing primary light source, such as a parking and turn signal light bulb. A wiring assembly may interconnect the supplemental light source with a controller, such as a switch. The combined primary and supplemental light sources may then be inserted into a vehicle light housing through an existing light bulb aperture, without creating additional apertures or otherwise modifying the light housing.