Simplicity itself, this black light bulb sits neatly into pretty much any bayonet style light fitting in lamps or light fixtures & gives off a constant stream of UV light, which is perfect for super-charging glow in the dark products & highlighting anything with fluorescent colours. This bulb is actually a fluorescent tube formed into the shape of a light bulb, much like modern ' Energy Saving' light bulbs. In fact, the black light bulb only uses 11 watts itself & will last for years & years. Ideal for people wanting to play with black light without having to change batteries or mount any new light-fixtures to the wall. Just replace a standard light bulb with this one & enjoy hours of UV fun. UV / Black Light bulb 240 volts / 11 Watts Bayonet fitting fits most lamp fittings Super-charge glow in the dark products Highlight fluorescent colours Low power consumption Long life UV light UV wavelength: 365nm