About this deal
However, they only offer a short effective working range (illumination distance) and require mains-powered operation to deliver their best results, both of which limits their use and practicality. Filtered short wave UV lights on the other hand, filter out almost all visible light, allowing only shortwave ultraviolet light to pass through. 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. There are two types of short wave UV light; filtered and unfiltered. As you can imagine, unfiltered UV lights allow a large amount of visible light through, rendering it useless for making many mineralsglow. Too much visible light passes through and drowns out the “glow”. Higher Quality Forensic Torch with a lower visible output, may be used for both close-up and distance work. Let price be your guide and do not buy cheap UV LED torches expecting good results!
Electromagnetic radiation is transmitted in waves or particles at different wavelengths and frequencies called the electromagnetic spectrum. It’s on this spectrum that we find UV light, X-rays and gamma rays. LED torches and Flashlights generally produce a strong ‘UV beam’ best suited to illuminate ‘at a distance’ and are not usually suited to close-up work, owing to the higher visible-light ‘interference’ output, which tends to mask (or suffocate) the resulting fluorescence.