This combination allows them to emit a larger amount of ultraviolet light than white light. Like other fluorescent black lights, they work with a special phosphor coating to filter white light however, for more complete blocking of white light, black light blue bulbs also are constructed of a purple-colored filtering glass. The light from a fluorescent black light looks similar as to the we are used to from ordinary fluorescent sources, though causes limited luminescence of external phosphors.īlack light blue fluorescents are much more commonplace. A fluorescent black light, which appears similar to any ordinary white fluorescent lamp, emits a relatively large amount of white light mixed with ultraviolet light. While both a fluorescent black light and a black light blue use UV light and phosphor coatings to create luminescence, the difference between them is simply how much invisible ultraviolet light they emit in terms of visible white light. However, because fluorescent technology produces much more of the UV spectrum, fluorescent black lights are more effective than incandescent black lights. In both BL and BLB technologies, this ultraviolet light causes external phosphors in its surroundings to glow, the same as an incandescent black light does. Fluorescent black lights use special phosphor coatings internally of the bulb to filter out visible light and improve the emission of ultraviolet light. Fluorescent black lights fall into two different categories, black light (BL) and black light blue (BLB). BLBįluorescent light sources naturally emit much more of the ultraviolet light spectrum, making the technology well suited for use within black lights. However, the relatively small amount of UV light incandescent bulbs produce makes incandescent black lights the least impressive of black lights. Like, the simplest form of black light, an incandescent black light, produces very little ultraviolet light but uses a special filtering glass called Wood's Glass to block most visible light produced by the bulb filament, thus enhancing the effectation of the UV spectrum.
All light sources produce UV in varying quantities. You may remember from our previous article on yellow bug lights that the short-wavelength spectrum of light beyond visible light is ultraviolet light. When ultraviolet light hits a phosphor, the phosphor glows in a phenomenon called luminescence.
You'll find phosphors-a loose grouping referring to special compounds and minerals-in and on all kinds of things: Highlighters, soap, rocks, glow-in-the-dark toys, and even your teeth. The origin of the light is a bulb, whether incandescent, fluorescent, CFL, or LED. The signature glow produced by black lights requires two separate things: A source of ultraviolet light and an area coated with UV-reactive phosphors. But how do black lights work? (Hint: It's not magic.) There's something fun and mysterious about revealing secrets and hidden messages with this strange purple light.
Uv light vs black light tv#
Whether you're spending time with friends in a laser tag arena, venturing through the narrow passageways of a haunted house, or simply just watching your favorite TV show, black lights never cease to amaze.
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