Since most of the visible light is filtered, and only UV light is passing through, short wave ultraviolet lights are the best black lights for minerals. These filters can be somewhat expensive which is why high quality shortwave UV lights are so expensive when compared to unfiltered long wave UV lights. Too much visible light passes through and drowns out the “glow”.įiltered short wave UV lights on the other hand, filter out almost all visible light, allowing only shortwave ultraviolet light to pass through. As you can imagine, unfiltered UV lights allow a large amount of visible light through, rendering it useless for making many minerals glow. There are two types of short wave UV light filtered and unfiltered. In nature, long wave UV light is present in sunlight and is not harmful to humans. Because of that, the black lights we use as hobbyists are a great way to produce long wave UV light. These filters are generally inexpensive to buy for that reason. Long wave UV lights have filters which screen out a lot of the visible light they produce, but not all. What is the difference between short wave UV light and long wave UV light? Long wave Ultraviolet Light Ultraviolet light falls in the range of the electromagnetic spectrum between visible light and X-rays. It’s on this spectrum that we find UV light, X-rays and gamma rays. ![]() UV light is not visible to the human eye.Įlectromagnetic radiation is transmitted in waves or particles at different wavelengths and frequencies called the electromagnetic spectrum. Ultraviolet light is a type of electromagnetic radiation, just like radio waves, infrared, X-rays and gamma-rays.
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