It's Halloween party time! We have the perfect way to convert your den into a true party room. These 13w Compact Fluorescent Blacklights plug into any normal recessed ceiling socket. Perfect for Halloween parties. Use several to make the whole room glow. Or, use together with a Mr. Light screw-in strobe in adjacent ceiling fixtures for glow + strobe effect for dance parties. If you don't have a recessed ceiling fixture, just screw these CFL's into any incandescent lamp socket. These are also great for attracting trick-or-treaters; use one to replace your normal porch light for and eerie glow and to let the kids know that you've got treats. UL listed, with lightweight electronic ballast.