Measured battery current is 400mA from fully charged 18650 cell. Measured with Triplett 630 by removing end cap and measuring current from negative battery contact to shell of flashlight. Reference a Q5 "white-light" emitter on "low" measures about the same. I measure the Q5 on "high" pulling about 2 amps, so, that may give you an idea of how "bright" the UV should be, ( being you can't see much of it. ).
It does excite fluorescence in clothing and dyes pretty well, however I do not see this as being as useful as a 365 nM light for seeing organics, pet pee, currency verification, or "crime scene" type stuff. But even if I find this somewhat sub-optimal, nothing says I can't later change out the emitter for another wavelength. The mechanics and workmanship of the Ultrafire flashlights are superb. They are easily disassembled for cleaning or parts replacement.
I note that I will pay more for a 365-nM emitter than Crazy-Cart charged me for the entire flashlight assembly, and that emitter will retrofit this flashlight if I need to go that way.
Note this is a 400 nM light. I intend to use it to find refrigerant leaks. I wonder if a 365 nM UV light would have been a better choice, as the 400nM is on the edge of visible. I liked the rugged nature of the WF-502b tube and the interchangeable nature of the flashlight components, so that weighed heavily on my decision. For what I paid for the whole assembly, I considered it quite a good buy, hence my 5-star rating. ( I own several other WF-502b flashlight assemblies, so keeping everything "in the family" is a strong pull for me ).
Note this flashlight does require an unusual battery.. a lithium-ion 18650 cell. You can find cells and chargers for these cells from this seller and others. Many laptop battery packs are populated with these cells, and when a laptop battery pack fails, often only one or two cells have actually failed, and the rest are perfectly good and work fine with this flashlight. The 18650 cell does have a lot of advantages to conventional cells when shelf-life and energy storage density are considered. The caveats are you have to take care to charge them properly. I have not seen these batteries at Radio Shack or Wal-Mart, so if you get this light, get some batteries and a charger too.
Also, I am concerned with the safety nature of UV flashlights. From what I understand, the common "blue-blocker" sunglasses are adequate to filter out anything harmful, as well as eliminating visible light in the blue area so the yellow fluorescence of the dye is accentuated. I note the "blue-blocker" sunglasses are readily available at the dollar-tree store just look for the amber-colored lenses. I will carry my UV light to test them to make sure the plastic they are made from doesn't fluoresce!
Click Here For Most Helpful Customer Reviews >>
For $16 delivered to the door, this light is a screaming deal. It works fine with a pair of 123A batteries so no need for the somewhat dangerous rechargeable. It's true this is only a pseudo UV drop-in. I solved that for $17 on a certain famous auction web site. Just search for "6P G2 365 nm Ultraviolet UV LED Bulb Lamp C1 L2 C5 501B" and wait a couple weeks. So for a grand total of $33, I have a great scorpion hunter that shines at 365nm. And yes, it does work better on bills and driver's licenses than the original drop-in.Best Deals for Ultrafire Wf-502b 390-410nm Uv Ultraviolet LED Flashlight Electric
I purchased this light to use for automotive oil dye detection. It didn't work for me. I also tried to use it for pet detection with lackluster results. It doesn't have the correct uv wavelength for my purposes. Although it is at a great price for a P60 style host. It is well made and is a good size. I also purchased the same light with a cree xml-t6 driver and led. I couldnt be happier.Honest reviews on Ultrafire Wf-502b 390-410nm Uv Ultraviolet LED Flashlight Electric
Well built and the reflector can throw light out to a decent distance, but that's the only good thing I can say about it. The wave length is in the visible spectrum and has a disappointing ability to light up fluorescent objects. The high amount of visible light makes it difficult to see if an object is fluorescing or not. The reflector creates a very narrow beam that doesn't seem to be very useful. I've compared this flashlight to the "Ledwholesalers Gallium Indium Nitride 365 Nm Uv LED Ultra Violet 9 LED 3 AAA Blacklight Flashlight, 7301uv365" and the "Abco Tech 9 LED UV 375 nm 3 AAA flashlight". The Ultrafire had the worst performance of all three. It did a poor job of identifying the fluorescent color strip in $5, $10, $20, $50, and $100 bills. Very difficult to see the UV markings on my driver's license. Scorpions do fluoresce but only faintly compared to the other two flashlights mentioned earlier. This flashlight will disappoint anyone looking for a good UV LED flashlight. If you want a low cost, powerful UV light and don't mind a blue or purple glow, go with the "Abco Tech 9 LED UV 375 nm 3 AAA flashlight" and get a yellow tinted sunglasses to completely filter out the blue light. When you combine the Abco light with yellow glasses you get the best UV light for very little money. If you want very little visible light with a decent amount of fluorescing ability, go with the "Ledwholesalers Gallium Indium Nitride 365 Nm Uv LED Ultra Violet 9 LED 3 AAA Blacklight Flashlight, 7301uv365". Dont waste your money on the Ultrafire unless you plan to modify it with another drop in LED with a lower wave length.One last con about this flashlight. While testing it I noticed that it kept getting hot. I've had other lights get hot because of the heat that the LED's put out, but this is different. After placing the flashlight on its side on my table and turning it on for one minute, the entire body warmed up. The temperature rose from 79 degrees to 87 degrees. The batteries stayed at 79 degrees and the temperature was the same at both ends. The metal body is actually creating enough resistance to the electrical current traveling through it, that it's generating heat. I don't know if this is normal or if I have a defective flashlight but I'm not comfortable holding such a warm flashlight, especially if it accidentally turns on in my pocket. This heat generated has to be draining my batteries much quicker due to the wasted energy. Good quality aluminum cases will generate some warmth as electricity passes through but I have higher voltage and wattage LED flashlights that don't even come close to getting this hot. IMO the aluminum is probably of low quality that is contaminated with impurities that create an excessive amount of resistance. Or I could just have a faulty flashlight with some sort of internal problem that would explain the dissapointing performance all around.
Find helpful customer reviews and review ratings for Ultrafire Wf-502b 390-410nm Uv Ultraviolet LED Flashlight Electric
I bought this flashlight because of the tail cap switch and the clip on the side for easy carrying.I used it primarily to check ID's at a bar, doesn't do anything to help me, advertised as the right wave length for checking ID's, but definitely isn't.
I bought a cheap little flashlight at the hardware store for $1.85 and it works 20significantly times better.
0 comments:
Post a Comment