The Sunlite 40-Watt FUL T10 blacklight bulb (BLB) emits ultraviolet (UV-A) light at 368nm color wave-length 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.