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Arcadia Support Portal :: What is the difference between UVA and UVB?

What is the difference between UVA and UVB?

A. Light is measured in nanometres. This is a way of allocating differing colours or wavelengths of light with a number. Light starts on a graph at blue on the left and red on the right. The chromatic graduation between these two colours is measured and a number allocated. So we start at invisible light like x-rays until we get to visible blue right up to red and infrared. UVA and UVB are the two safe forms of Ultraviolet. There is a third classification which is UVC. UVC is deadly and these lamps are  used as a germicidal product for sterilization in hospitals and even in ponds to kill algae and alike.

UVC is measured from 180-280nms, no reptile lamp should emit light in this wavelength.
UVB is measured from 280-320nms, the optimum wavelength for D3 production is 297nms. You should look for a lamp with a small peak at this wavelength.
UVA is measured from 320-400nms.
Humans seem too able to see wavelengths from 400nm to 700nms which is deep red. After 700nms we describe this as infrared.


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Last Updated
13th of April, 2012

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