LIGHTFE Black Light UV Flashlight 365nm Blacklight UV301D with LG LED Source,Black Filter Lens, Max.3000mW high Power for Resin Glue Curing Light, Rocks and Mineral Glowing,A/C Leak Detector

Who is this for? If you're curious about fluorescence (minerals, body fluids, terrestrial arthropods etc.) then this is the best consumer-oriented UVA/B flashlight on the market. The only place to go from here is even more specialized equipment meant for labs, and this generally means separate power supplies for wattages greater than 20W and prices *starting* at ten times that of this flashlight. How does it look? Three UV LEDs are powered by a custom triple lithium polymer battery pack. Two of these custom battery packs are included, each at about half charge. Their capacity is enormous and even with line power expect several hours for a full recharge. The LED-containing head of the flashlight can be taken off entirely and replaced with the dummy endcap. Putting this dummy cap on the open end exposes the charging ports on the base of the flashlight body, with a USB-C port for charging the battery and a USB-A port for discharging it to power a phone, e.g. There are two buttons, one for power and the other for selecting intensity. The flashlight can be locked, and prevented from illuminating, by pressing both at once for a certain length of time. It feels as heavy as a small handgun or large cordless drill and even though it has a lanyard I would not expect the nylon of this to hold up to a lot of swinging from the wrist. It's that heavy. What does it do? There are three intensity settings. In an interior space lit with many lights during the day this flashlight will fluoresce things from across the room on any of its three settings. At night or in perfect darkness indoors the effect is startling. You will see fingerprints and handprints on painted walls, huge numbers of them near highly-trafficked areas. If your drinking water has any concentration of iron or iron salts every surface in bathrooms will glow from the deposited metals. You will see fluorescent lint in several colors on every fabric surface and most smooth ones. This lint has been coated in the fluorescent chemical that laundry detergent contains to make white clothes fluoresce subtly in sunlight, making them appear cleaner than new. In some ways surfaces that do not fluoresce at all are more interesting than those that do. Porcelain cups or china plates generally do not have fluorescent glazes and these, when the flashlight is put on them, have a very deep and monochromatic purple color. It's startling to see white china become as darkly purple as if you had coated them in machinist's layout fluid. This is the very deep purple color of the Wood's filter and represents the most extremely violet light produced by the LEDs. This light is so next-door to UV-A, which is invisible, that it has a not-quite-there quality and lends this ghostliness to things it shines on. Human skin, particularly one's own, is also startling. Firstly because the beam feels like direct sunlight even though the total amount of visible light is in the arena of 1 watt. Age spots are greatly enhanced and even freckles that disappear during the winter are revealed in greater-than-summer contrast. The different bacteria that live on skin are shown, with those in hair follicles being a very striking orange. The visible light from the flashlight is greatly attenuated by the Wood's glass filter. Without anything fluorescing significantly it seems to be perhaps a watt or two of visible light (much less light than a single christmas tree bulb.) But placed over something fluorescent, like a glass of tonic water, there is very suddenly about as much light as a 20 watt bulb. This effect is very striking because it appears to violate the brain's way of interpreting cause and effect. Despite the fact that 20 W of UV light is a lot for a handheld device, 20 W lightbulbs are not very bright. It is therefore easy to wish even this huge amount of UV light were greater because the only thing to compare it to is not other UV flashlights, but those built specifically for visible light. And these, especially anything in this pricepoint, are many times as powerful. ***Eye Protection*** The cornea of the eye readily absorbs all wavelengths of UV light. This is done to save the retina from damage and protect the ocular jelly from becoming cloudy. However the cornea is transparent and poorly supplied with nutrients and blood. This means that damage done tends to accumulate. This is what cataracts are, and why elderly people are most affected by them. At any setting this flashlight will absolutely produce cataracts in the long-term and something like snow blindness (corneal sunburn) in the near-term. Window glass/flint glass absorbs almost all hard UV (UV-C) and around 60% of the wavelengths that pass this flashlight's Wood's filter (UV-A and UV-B.) This means that eyeglasses with glass lenses are not enough protection. Polycarbonate is a much better absorber of UV light. However even eyeglasses with polycarbonate lenses are not enough protection, as your corneas are still exposed from the side. Polycarbonate safety glasses with wraparound, one-piece lenses are the best solution. Anything made of polycarbonate will filter nearly all the UV light produced by this flashlight, or for that matter the Sun. The bottom line is that anyone using this flashlight and anyone in the presence of its use needs full eye protection made from polycarbonate plastic. Is it well made? Yes. This is at least as well made as a rifle scope, high-end handtool or pro kitchen equipment. The threads are all greased with Vaseline and the rubber gaskets seal well in their glands. Wood's glass is loaded with metals and is therefore much more fragile than even untempered windowglass. Because of this the filter is very likely to break if the whole flashlight is dropped. That said, every other component appears to be robust enough for heavy use. This flashlight comes in a small and cheaply made hardcase with adequate, low-quality foam padding. The first time I bought this flashlight one of the diodes had a manufacturing error that made it illuminate only about a third of its area. The return was handled by amazon and a replacement (a-ok) was sent as soon as the defective one was in the mail. The total turnaround from noticing the defect to holding the replacement flashlight was 4 days. If you're curious about this problem in your own flashlight you can hold it close to a flat surface and look at the shape of the three blobs of light cast there. Good diodes should cast roughly square blobs of light. Defective diodes will show patterns that differ from the other two. This is also visible by looking directly into the head with protective glasses on but it is no better at verifying a defect than the indirect method, and should be avoided as a matter of principle.

This light works well and illuminates Florescent rocks quite well. Battery is a standard AA which can easily be changed out without charging.

Nice but expensive

After a long long time of searching I bought this little uv light. It came with a nice sturdy box. The box was as advertised including the battery. I am very pleased with my purcase. It is small and very affective for finding dog urine. It was important for me to have a flashlight that did not spread UV light over a large area. Because it is 365nm and it is harmfull for eyes and etc. But it is really good. It shows everything in the dark. I mean everything!!! When I first look at my house with this I was horrified. It looked like a crime scene. Little dusts, water marks, pet urine residue, detergent residue, food or beverage stains, finger/hand/footprints... OMG... But of course the light is soo great you can easily separate the marks by their color. Even without a uv protection glasses. But I recommend to use one. I used this light in broad daylight it still shows the marks but ofcourse you have to bring it closer to see what is on that area. I needed this for detecting pet urine. Like every pet owner knows we do have enough experience on accidents. It does the job very well. The floor in my house is ceramic and I can even see the urine residue in between the tiles. The thin line gap between the tiles lights up and I can see the difference comparing to other tiles. If you have an obsession for cleanliness do not buy this light or in that matter any uv light because you will go crazy. In my final words I would like to thank the manufacturer for this marvellous gadget😃 It is great, it has quality and it is affordable comparing to professional uvlights and as good. 👏👏👏

I am using this to polymerize UV resin on model kits. This seems to work very well so far. Most UV light sources are 395 nm and the lower wavelength of this light works very well and quickly with my UV resin.

This is a wonderful flashlight. It's long-wave UV for sure, not some violet LED. However, the switch is lousy. As another reviewer said, unscrew it half a turn or so, turn it on, and screw with it. Then it will be OK for a while. No guarantees on how it will be the next time you try it. I'm going to keep it in spite of the switch because getting actual long-wave UV from Amazon is an iffy thing.

I like the item it’s good to use it for finding scopunes at this time of the year

Great for checking out bathrooms at hotels, very little light leakage, took on a camping trip and it showed scorpions in the bush nicely. It's well worth the money. The throw for this torch is quite small though. So don't expect much to show up outside of a few metres

OMG this Lightfe 365nm black light UV is just little Torch, BUT seriously so powerful it lights EVERYTHING up! It's a wide and long Beam 2-3meters is brilliant! Best UV 365nm Black light torch EVER! So impressed, no hassles in giving this UV 365nm Black light torch a 10/10 score rating..winner! I stressed over the so many similar UV 355nm blacklight torches as got a dodgy one that was crappy previously..so glad this Lightfe 365nm blacklight was EXACTLY what it stated in eBay ad description that it achieves and does when it arrives in your letterbox! Awesome ✔️👍

Bought it as it had the most positive reviews. Solid build and easy to use. After switching the battery out from the one supplied to a fresh one, the beam works sort of okay for what I need (curing resin on 3d print jobs). I probably need to get something a little more higher powered but this will do.

Can't really comment on 'water resistance' but it works great.