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What is a black light? The relationship between black light and ultraviolet light

What is a black light? The relationship between black light and ultraviolet light


Black light is also called ultraviolet light. In foreign countries, foreigners often refer to ultraviolet light as black light.

A black light is a lamp that emits ultraviolet light in the UVA band. Among them, UVA band (320nm-400nm) ultraviolet lamp is also called UVA lamp, which of course also includes UV flashlight and Wood’s lamp. The name Wood’s lamp comes from the name given to it by its inventor, Robert Williams Wood.

  1. What is a black light? Why is it called a “black” light?

Although a black light emits ultraviolet light, the human eye cannot detect ultraviolet light, so as far as the human eye is concerned, the light is “black” in a way that cannot be seen.

Many black light manufacturers intentionally emit some violet light for the purpose of warning and protection, which helps users avoid overexposure to ultraviolet rays, which can damage eyes and skin.

  1. What types of black lights are there?

There are many types of black lights, including incandescent lamps, fluorescent lamps, light-emitting diodes (LEDs), lasers, and mercury vapor lamps. Among them, the ultraviolet rays produced by incandescent lamps are at least almost negligible.

Some blacklights consist of a filter that blocks visible light but allows UV rays to pass through. This blacklight bulb or filter typically emits a dim, purple-blue projected light. For this reason, the lighting industry calls these devices “BLB,” which stands for “Black Light Blue.”

Other black lights, these lights tend to be brighter due to the lack of filters. Like the type of fluorescent light used in “Bug Opener,” this light is called “BL,” which stands for “black light.”

A black light or ultraviolet laser produces coherent monochromatic radiation that is invisible to the human eye.

Goggles are required when using this type of equipment as strong UV rays can cause permanent blindness and other tissue damage.

  1. Use of black light

The ultraviolet rays emitted by black light lamps can be used to observe fluorescent dyes, increase the brightness of phosphorescent materials, cure plastics, trap and kill insects, promote the production of melanin in the skin, and take artistic photos, etc.

In addition, black light lamps also have various applications in medicine. Use UV light to disinfect, diagnose fungal infections, bacterial infections, acne, melanoma, ethylene glycol poisoning, and to treat neonatal jaundice, etc.

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