Abstract: A dual bicycle headlight and taillight of a compact and lightweight configuration can be mounted on a bicycle handlebars as a headlight to project white light from a white light emitting diode and, alternatively, mounted on a rear of a bicycle as a taillight to project red light from a red light emitting diode. The projected light in both modes of a headlight or a taillight will be parallel to a support surface that the bicycle will traverse. A single flexible mounting strap is rotatably attached to a common light housing to provide a secure mounting of the headlight and taillight modes of operation by the same light housing.