Triangle Bulbs T20407-6 (6 pack) - 40T10/BL, 40 Watt, T10, 120 Volt, Blacklight, Standard E26 Base, Incandescent Light Bulb, 6  Pack Pack of 6 Light Bulbs 40T10BL 40W Black Light Tubular Bulb Great for Holidays, Dorms and Specialty AR Sturdy Black Light used for decorative and artistic lighting effects