This 75 watt Incandescent Purple R25 Flood Purple Bulb fits into most any standard fixture. Great purple color. Use for Halloween, parties, or poster art. FOR TRUE BLACK LIGHT UV EFFECTS PLEASE, PLEASE SEE OUR SELECTION OF FLUORESCENT FIXTURES OR COMPACT FLUORSECENT BULBS (shown left) AS THIS 75 WATT PURPLE BULB DOES NOT GIVE OFF MUCH TRUE BLACKLIGHT EFFECT, and is not recommended for fluorescent cosmetics, tableware, and other similar blacklight reactive supplies. Caution: These bulbs burn very hot and may cause burns. Rated for indoor use only. 120 Volt E26 Medium Screw Base 500 Average Life Hours 4.5" Tall x 3" WideDamar Worldwide 4 LLC