A portable, self-contained, black light device that is incorporated into or adaptable to a head gear to be used in combination with fluorescent or phosphorescent material for entertaining effect or promotional purposes. The portable black light device has a housing with a plurality of openings, a plurality of UV LEDs protruding from each opening and a power source within the housing for energizing the UV LEDs. With the portable black light device incorporated or adaptable to the visor or brim of a head gear, and in combination with fluorescent paint or make up on a wearer's face or fluorescent decorative element, cause the fluorescent paint to glow as if internally lit, providing an effective entertainment or advertisement.