Pack Of 6 40T10/BL, 40 Watt, T10, BL, 120 Volt, Blacklight, Standard E26 Base, Incandescent Light Bulb Great for Holidays, Dorms, and Specialty Art Ideal for Special Effects and Party Lighting Make your house glow for Halloween or great for stage lighting and haunted houses Can also be used to keep pets feeling healthy in their natural cozy habitat Features a black finish and is compatible with standard base sockets