The party never has to end with Feit Electric Black Light LED Bulbs. Get the same blueish-purple glow-in-the-dark light for Halloween parties, birthday parties, raves, nightclubs, and DJ sets, while saving on energy costs compared to traditional fluorescent and incandescent lights. The A19/BLB/LED blacklight turns on instantly, offering flicker-free full illumination. It doesn't need any warmup time, is RoHS compliant, and is 100% mercury-free. The estimated energy cost is only $0. 84 per year. This long-lasting LED bulb shines up to 11,000 hours for years of glowing fun. Switch to LED blacklights and kick up your celebration with glowing decorations, clothing, accessories, body paint, posters, and artwork.