1-LED 370nm UV

1-LED 370nm UV LED Flashlight, retail $5.99 (http://store.advancedmart.com...)
Manufactured by (Unknown) for Advancedmart (www.AdvancedMart.com)
Last updated 11-06-09

This unnamed flashlight is an aluminum-bodied light that has 1 UVA (advertised as 370nm) LED in the end, powered by four LR41 button cells in the barrel.


Getting this light to work is as easy as turning the head clockwise (as if tightening it) until it lights up; turn it the other way to turn the LED back off.

To change the batteries in this flashlight, unscrew and remove the bezel (head), dash it to the ground, and stomp on it with spiked golf shoes...O WAIT!!! THAT'S THE GOOD PART!!! So just set it aside instead.

Tip the open end of the barrel into your hand, and dispose of or recycle as you see fit the used LR41 cells that come out.

Stack four new LR41 cells on a table, counter, or other flat surface, flat-end (+) positive up, lower the flashlight's barrel over the pile, slide the whole thing to the edge, place your thumb or finger there so it covers the barrel when you slide it off the edge (so all those new batteries don't just clatter all over the floor), and invert (flip over) the barrel so the open-end faces upward.

Screw the bezel back on, and unscrew it slightly when the light springs to life so you don't just waste those new batteries.
Aren't you glad you didn't stomp on that bezel now?

Unable to measure current usage due to how the product was constructed.

I beat the living tweedle out of it (gave it ten firm whacks against the concrete floor of a patio; five whacks against the side of the tailpiece and five whacks against the side of the bezel), and found the expected damage. There is some VERY minor gouging to the bare Metalcherrymon - er - the bare Metalgomamon - um that's not it either...the bare Metalagumon...er...uh...wait a sec here...THE BARE METAL (guess I've been watching too much Digimon again! Now I'm just making {vulgar term for poopoo} up! ) on the sides of the tailpiece and bezel where it was struck. No optical or electrical malfunctions were detected. It still works as well now as it did when I received it yesterday afternoon.

This flashlight is splash- and weather-resistant at absolute maximum, but I do not believe it is submersible. There's an O-ring on the bezel, but it doesn't engage unless the light is turned on. So please try not to drop it in creeks, rivers, ponds, lakes, oceansides, docksides, puddles of wild boar urine, slush piles, mud puddles, tubs, toilet bowls, cisterns, sinks, fishtanks, dog water dishes, or other places where water or water-like liquids might be found. A little rain or snow probably wouldn't hurt it though, so you need not be too concerned about using it in lightly bad weather.

If it fell in water and you suspect it got flooded, disassemble it as you would for a battery change, and set the parts in a warm dry place for a day or so just to be sure it's completely dry inside before you reassemble and use it again.

If it fell into seawater or if somebody or something peed on it, douche all the parts out with fresh water before setting them out to dry. You don't want your flashlight to smell like seashells or urine when you go to use it next. Besides, salt (from seawater or pee) can't be very good for the insides.

The peak wavelength advertised is 370nm; this was spectrographically measured at approximately 384nm; while this wavelength is longer than advertised, this is STILL a nice UVA product, and is built a lot better than some other UV keychain lights.

I must emphasize, protect your eyeballs when using this light. You only get one set of eyes - and if you wreck them, you can't just go down to the local seven-eleven and buy a can of them.
Here is one simple way you can do this:

Most sunglasses and some prescription eyeglasses have some degree of UV protection already; to determine if yours do or not, aim the flashlight at something that clearly fluoresces (such as those neon green & orange stickers that occasionally show up on your mail, day-glow orange price tags, or painted portions of a blacklight poster), positioning the light so the object in front of it glows (fluoresces) brightly from the ultraviolet light. Then put the glasses between the face of the light and the target. If the glow stops or dims dramatically, the glasses are stopping the UV and you can use them as eye protection at least for short-term use.
However, if the glow remains or dims only slightly, look for another pair.

In any case, never look directly at the LEDs without eye protection - not even for a minute.

Symptoms of UV exposure may not appear immediately; they can be delayed by 30 minutes to several hours. They can include a burning or "sand in the eyes" sensation, and a hazy look around light bulbs and other bright objects. Mild cases are self-correcting within 24 to 36 hours; however if despite my warnings you still stared at this light from close range for more than a few minutes, it might not be a bad idea to see an eye doctor and tell him you've been exposed to UVA radiation.

DISCLAIMER: I shall not be held responsible for any damage or loss of eyesight arising from your use or misuse of the information on this page. Thank you for listening.

The flashlight has a label on it with the following text:

Ultra Violet (UV) Light
Visible and Invisible
LED radiation can
damage your eyes.
Do not stare at the LED
light or reflected UV light
Keep away from children

The LED has its bond wires ("whiskers") attached at its flat sides, not its corners. So I know for a fact that Nichia does not make it. I do not know who does, so please stop asking.

Power output measures ~15.6mW at ~384nm.
So the LED is overdriven, but I do not know by how much.

Beam photograph on the test target at 12".
There was some fluorescence from the target, but it was rather minor.
Wavelength is too short for me to measure intensity.

The security strip in a US $20 bill fluorescing.

Security features in an ID card and a Visa debit card fluorescing.

Screwdrivers fluorescing in the UVA radiation output by this product.

Plastic hummingbird from a set of Hummingbird Wind Chimes glowing.
The hummingbird shown is the transparent light blue one.

Spectrographic plot
Spectrographic analysis of the LED in this flashlight.

Spectrographic plot
Same as above; newer spectrometer software & settings used.
USB2000 spectrometer graciously donated by P.L.

Test unit was sent by J.W. of AdvancedMart on 10-31-06, and was received on the afternoon of 11-02-06.

UPDATE: 00-00-00

Wavelength is close to the wavelength advertised
Easily one of the shortest wavelength UV LED flashlights available
Built better than most other UV LED keychain flashlights

Not waterproof or submersible

    PRODUCT TYPE: UVA LED Flashlight
    LAMP TYPE: 5mm LED
    No. OF LAMPS: 1
    BEAM TYPE: Medium spot w/dim corona
    SWITCH TYPE: Twist bezel on/off
    BEZEL: Metal; LED inset into hosel for it
    BATTERY: 4xLR41 button cells
    CURRENT CONSUMPTION: Unknown/unable to measure
    WATER RESISTANT: Light splatter-resistance at maximum
    ACCESSORIES: 4xLR41 cells, small split ring, swivel
    WARRANTY: 90 days


    Star Rating

1-LED 370nm UV LED Flashlight * http://store.advancedmart.com...

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