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A blacklight, also called a UV-A light, Wood's lamp, or ultraviolet light, is a lamp that emits long-wave (UV-A) ultraviolet light and very little visible light. [ 1 ][ 2 ][ 3 ] One type of lamp has a violet filter material, either on the bulb or in a separate glass filter in the lamp housing, which blocks most visible light and allows through U...
- What Is A Black Light?
- Why Is A Black Light called A "Black" Light?
- Types of Black Lights
- Black Light Uses
- Black Light Safety
- Sources
A black light is a lamp that emits ultraviolet light. Black lights also are known as ultraviolet lamps, UV-A light, and Wood's lamp. The name "Wood's lamp" honors Robert Williams Wood, the inventor of glass UV filters. Nearly all of the light of good black light should be in the UV portion of the spectrum, with very little visible light.
Although black lights emit light, ultraviolet light is not visible to human eyes, so the light is "black" as far as your eyes are concerned. A light that only gives off ultraviolet light would leave a room in apparent total darkness. Many black lights also emit some violet light. This allows you see that the light is on, which is helpful in avoidin...
Black lights come in many different forms. There are incandescent lights, fluorescent lamps, light-emitting diodes (LEDs), lasers, and mercury-vapor lamps. Incandescent lights produce very little ultraviolet light, so they actually make poor black lights. Some consist simply of filters over other light sources that block visible light but permit th...
Black lights have many uses. Ultraviolet light is used to observe fluorescent dyes, improve the brightness of phosphorescent materials, cure plastics, attract insects, promote melanin production (tanning) in skin, and illuminate artwork. There are multiple medical applications of black lights. Ultraviolet light is used for disinfection; diagnosing ...
Most black lights are relatively safe because the UV light they emit is in the longwave UVA range. This is the region closest to that of visible light. UVA has been linked to human skin cancer, so extended exposure to black light radiation should be avoided. UVA penetrates deeply into skin layers, where it can damage DNA. UVA does not cause sunburn...
Gupta, I. K.; Singhi, M. K. (2004). "Wood's Lamp."Indian J Dermatol Venereol Leprol. 70 (2): 131–5.Kitsinelis, Spiros (2012). The Right Light: Matching Technologies to Needs and Applications. CRC Press. p. 108. ISBN 978-1439899311.Le, Tao; Krause, Kendall (2008). First Aid for the Basic Sciences—General Principles. McGraw-Hill Medical.Simpson, Robert S. (2003). Lighting Control: Technology and Applications. Taylor & Francis. p. 125. ISBN 978-0240515663- Anne Marie Helmenstine, Ph.D.
Jun 4, 2020 · Black light is ultraviolet light that is invisible or “black” to the human eye. Learn about the different types of black lights, how they work, and what they are used for in science, art, medicine, and more.
Black lights cause everyday objects to glow in the dark. Learn how black lights work and about uses for different types of black lights.
- Limited exposure shouldn’t cause any issues, but prolonged eye contact without eye protection can cause retina damage.
- Black light is a type of UV light that emits ultraviolet radiation. This radiation has a shorter wavelength than violet light, which is the shortes...
- No, black light cannot reveal bacteria or other germs.
- Black light shows mostly ultra violet or “black” light, hence its name, but “leaks” purplish light.
- Thiamine, riboflavin, niacin, fluids and vitamins shine under black light. Urine, semen and blood contain fluorescent molecules, so they also show...
May 11, 2015 · A black light is a type of light bulb that emits mostly ultraviolet radiation. Although most bulbs also give off a faint violet glow, the majority of the light is outside the visible range. This energetic radiation excites molecules, often producing fluorescence or phosphorescence.
May 1, 2024 · A black light gives off highly energetic ultraviolet light. You can't see this part of the light spectrum, which is how "black" lights got their name. Everyday items such as ripe bananas and tonic water will glow under a black light, as well as some currency and plastics. But how does that work?
Blacklights are most commonly used when the fluorescence of objects needs to be observed, with as little visible light as possible. Generally, this means that a blacklight will emit primarily UV-A radiation, and very little visible light. Below, we discuss 4 questions you should consider before purchasing a UV blacklight.
