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Glossary for Lighting Terms
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U

Ultra-Violet (UV)

  1. A reference to anything that uses or emits ultra-violet radiation.
  2. 2) Electromagnetic radiation having a wavelength longer than x-rays but shorter than violet light, i.e. approximately 40nm to 380nm.

UltraViolet Light (UV Light)
Although not actually light, this is a commonly used term for Ultraviolet Radiation.

UltraViolet Radiation (UV Radiation)
Invisible electromagnetic energy of which the longer wavelengths are used to excite fluorescent materials. The wavelengths below below 320nm are potentially harmful to human tissue.

Umbrella
An umbrella made from reflective fabric used for bounce lighting.

Unit
A term that is often used interchangeably with Luminaire.

UV
Abbreviation for Ultraviolet.

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