4 Pack Powerful Black Lights: Each 42W halloween black light bars with 68 units high quality LEDs can light up a 355 square ft area. It provides 120 degree wide beam angles, 50,000 hours long life and high power efficiency; Fluorescent Reactive: Wavelength: 385-400 nm, Safe-A level, safe to use. Use PC lens with high light transmittance, it produces more pure black lights than other PC lens. Ideal to work with most reactive pigments, dyes, and paints. Especially with neon-colored objects(Our products are not suitable for people under 15 years of age); Easy To Install and Use: Comes with 5.0ft/1.5m long cord and switch, this black glow light can be conveniently switched on or off. Standard US power cord with plug, no need to wire, just plug and play. Easy to position with 180°adjustable bracket. Works with AC input from 100V-120V; Long-Lasting Metal Design & Efficient Cooling: The special fin-type heat sink design on the back of the blacklight, and the high quality aluminum housing, whi