Sunlite FUL18T6/bl/5PK Fluorescent 18W Black Light U Shaped FUL Twin Tube Plugin Lamps, 4-Pin GX10Q Base, 5 PackStyle:18Watt | Size:5 Pack The Sunlite 18-watt FUL T6 blacklight bulb (BLB) emits ultraviolet (UV-A) light at 365nm color wavelength perfect for lighting up reactive surfaces while not illuminating the surrounding areas. Ideal for creating a glow effect with colors like true white and neon hues for parties, clubs, and Halloween decorations. Great for attracting insects to bug zappers. Can also be used for verifying security features on ID cards and currency and detecting pet stains on carpets or furniture that are not otherwise visible to the naked eye. GX10q 4-Pin base works with a variety of lamps and fixtures. Long 5,000 hour life span. Convenient 5 pack.