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Easy to use. Adjustable zoom/focus. A little to blue to be a good UV light. It still works as one but there is a lot of blue light emitted. When I bought this light it was listed as "UV" but now I see it's been changed to "blue". So if you're buying it as a blue light then to... Easy to use. Adjustable zoom/focus. A little to blue to be a good UV light. It still works as one but there is a lot of blue light emitted. When I bought this light it was listed as "UV" but now I see it's been changed to "blue". So if you're buying it as a blue light then disregard this con. It's easy to use and of decent quality but I would recommend another light if you're looking for a UV light. If you want a focusable blue light - get it. If you want a UV light - don't get it. Read more

I haven't checked the wavelength of this light, but it works very well for detecting UV dye in automotive uses, which is what I bought it for. With 18500 batteries this light is very bright. With the adjustable focus it's easy to illuminate an engine compartment on high power, then switch to and... I haven't checked the wavelength of this light, but it works very well for detecting UV dye in automotive uses, which is what I bought it for. With 18500 batteries this light is very bright. With the adjustable focus it's easy to illuminate an engine compartment on high power, then switch to lower power and fine tune the focus to pinpoint leaks. I'm very pleased with the functionality as a leak detection aid. The body of the light is all plastic and feels flimsy compared with other focusable lights from DX. That being said, for typical use I don't expect any service life complaints. The light is a bit more blue in appearance than a standard UV light, but it works just fine for detecting UV dyes. You cannot really go wrong with this light if you need a bright, adjustable focus UV LED light. The light comes with a holder to fit 3 AAA batteries, or remove that and use one 16500 battery. They market this as a "blue" LED light, and the appearance is slightly more blue than a typical UV light, but it still works excellent as a UV light. Read more