BLACK LIGHT Black light effects: this 6" fluorescent black light tube can be used to illuminates areas of posters, paints, walls.. * Not only will it make things glow, but it also has a built-in regular flashlight. * This fluorescent black light includes built-in easel stand,nylon carry strap, and on/off switch. Requires four AA batteries. Not included. This mini plastic black light measures 6" .