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The 18W American DJ BLB18W Ultraviolet LED Blacklight Bulb is a Par 38 bulb with an E27 medium screw base for standard light sockets. It's used to create unusual effects at parties or in permanent installations like nightclubs, bars, bowling centers, roller rinks, and entertainment centers. The 30° bulb runs on 100-240 VAC current and has a 10,000 hour lifespan making it virtually maintenance-free.