Replace an ordinary bayonet fitting light bulb with this energy saving black light blue ultraviolet UV helix spiral light bulb and you can instantly flood a room with ultraviolet light. One 25W light bulb is enough to create glow in the dark lighting effects in a medium-sized domestic room making these ideal for parties, discos, pubs and nightclubs as well as for a range of industrial uses. The triple turn compact fluorescent design makes this both efficient and extremely compact. Features a BC-B22d bayonet (22mm) cap base. Not suitable for dimming.Need more help in choosing a suitable ultraviolet light bulb or tube? Read our guide Choosing Ultraviolet Bulbs UVA, UVB and UVC