Black light

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Black light fluorescent tubes. The purple glow of a black light is not the UV light itself, which is invisible, but visible light which escapes being filtered out by the filter material in the glass envelope.

A black light, also referred to as a UV light, ultraviolet light, or Wood's lamp, is a lamp that emits ultraviolet radiation (UV) in the long-wave (near ultraviolet, UVA) range, and little visible light. Other types of ultraviolet lamp emit large amounts of visible light along with the ultraviolet; however, a "black light" usually refers to a lamp that has a dark blue optical filtering material in the glass envelope of the bulb (or the lamp housing) which blocks most of the visible light, so the lamp emits mostly ultraviolet. Ultraviolet radiation is invisible, but a small fraction of visible light passes through the filtering material, with wavelengths no longer than 400-410 nm, and as a result, when operating the lamp emits a dim purple or violet glow. Wood's glass is one type of filtering material which is used in black lights.

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• Related: Wood's glass, Blacklight poster

Skin Care Guide Skin Care Guide www.skincareguide.ca/glossary/w/wood's_light.html - Web

Wood's lamp Wood's lamp www.homephototherapy.com/woodslamp.htm - Web

U.V.C to U.V.A conversion Phosphors for Black Ligh... U.V.C to U.V.A conversion Phosphors for Black Light sources www.sylvania.com/.../ - Web

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Black Light Theatre World Web Black Light Theatre World Web www.blacklight-theatre.com - Web

Black Light Photography with fluorescent materials Black Light Photography with fluorescent materials www.beobeyond.com - Web

About.com - "What Materials Glow Under a Black or ... About.com - "What Materials Glow Under a Black or Ultraviolet Light?" chemistry.about.com/cs/howthingswork/f/blblacklight.htm - Web

- "Medical Uses for a Wood's Lamp" - "Medical Uses for a Wood's Lamp" www.ijdvl.com/.../article.asp?issn=0378-6323;year=2004;volume=70;issue=2;spage=131;epage=135;aulast=Gupta - Web

Black Light Theatre Theodor Hoidekr Black Light Theatre Theodor Hoidekr www.blacklight-event.wbs.cz - Web

Black Light Puppets Black Light Puppets www.youtube.com/watch?v=MKAIkA1rXrs - Web

Examples of Black Light Painting Examples of Black Light Painting www.jacquesmayou.com/index.php?page=blacklight&p=2 - Web

Database of fluorescent minerals with pictures, ac... Database of fluorescent minerals with pictures, activators and spectra (fluomin.org) www.fluomin.org/uk/list.php - Web

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