FTB-8T6-BL 8 Watt blacklight fluorescent bulb. Black light is the popular term for ultraviolet energy near the visible spectrum. Blacklights are used for a wide variety of applications including color matching, curing, sanitization, particle identification, art display, recreation, automotive, R12 chemical leak detection, and lots of fun stuff. We couldn't find these specific ones listed anywhere so we may be the only source for these replacement bulbs for your blacklight devices. U Bend shape with 4 pin base. We've been told that there are adapters that will allow you to screw these into a regular light socket, but haven't found them yet. Unused. One of our customers advises that this works in his 15 Watt Bug Zapper which needs UV!