FUL BLACK LIGHT (BLB) - The Sunlite 25 watt blacklight bulb (BLB) emits ultraviolet (UV-A) light at 365nm wavelength perfect for lighting up reactive surfaces while not illuminating the surrounding areas. GX10q 4-Pin Base. BUG ZAPPERS - Great for attracting bugs to bug zappers. Direct replacement bulb for a variety of models. FESTIVE LIGHTING - Ideal for creating a glow effect with colors like true white and neon hues for parties, clubs, and Halloween decorations. VERIFY AND DETECT - Also great for verifying security features on ID cards and currency. Also use to detect pet stains on carpets or furniture that are not otherwise visible to the naked eye. LONG LIFE SPAN - Long 5,000 hour life span means up to 4.6 years of reliable service (based on 3 hours/day use).