41x UV LED Flashlight, retail $14.98 (http://cgi.ebay.com...)
Manufactured by (Unknown)
Last updated 12-22-11

This 41-UV (ultraviolet) LED flashlight does not have a formal name that I know of, so I'll just call it a "flashlight" on this web page.

It comes in an aluminum body, has 41 ultraviolet LEDs in its bezel (head), uses four AAA cells in a carriage in its barrel, and has a rubbery pushbutton on/mode change/off switch on its barrel. Yes, I said "mode change" here - you can select low or high modes.

The batteries (four AAA cells) are not included, so you'll have to buy some or have some on hand before you can use this flashlight.


To use this flashlight, feed it first (see directly below), and then you can go to town.

Press the button on the barrel until it clicks and then release it to turn the flashlight on in low mode (21 LEDs).
Press the button on the barrel until it clicks and then release it to turn the flashlight on in high mode (41 LEDs).
Press the button on the barrel until it clicks and then release it to turn the flashlight off.

Yes, it really is as easy as that.
Doesn't get much easier than this with multimode flashlights.

There is no momentary or signalling mode available when the flashlight is off, however, you can blink the flashlight while it is on by partially depressing the button. If you don't mind the backward or reverse feeling of this, you can blink the flashlight this way.

To change the batteries, unscrew and remove the tailcap, throw it to the ground, and stomp on it with old or used bowling shoes...O WAIT!!! YOU'LL NEED THAT!!! So just set it aside instead.

Tip the black plastic battery carriage out of the barrel and into your hand. If necessary, remove and dispose of or recycle the used AAA cells from it.

Insert four new AAA cells into the carriage, orienting each cell so its flat end (-) negative faces the spring for it in each chamber.

Slide the now-full battery carriage into the flashlight barrel, orienting it so the metal contacts on one end of the carriage goes in first. Finally, screw the tailcap firmly back on.
Aren't you glad you didn't stomp on that tailcap now?

The flashlight appears to be reasonably sturdy, and it is. When I administered the smack test on it (ten whacks against a concrete sidewalk; five whacks against the side of the tailcap and five whacks against the side of the bezel), I found the expected damage. There is some gouging on the sides of the tailcap and bezel where it was struck. No optical or electrical malfunctions were detected.

I used the sidewalk in front of our building for "The Smack Test" this time instead of the patio because my sister's asleep on the couch, and all that racket (banging noises from beating the urine out of the poor, defenseless flashlight) would have awakened her.

This flashlight is splash- and weather-resistant at absolute minimum, but it is not submersible. So please try not to drop it in creeks, rivers, ponds, lakes, oceansides, docksides, puddles of African elephant pee (I guess you have to sneak into a circus for that!!!), 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 moderately bad weather.

If it fell in water and you suspect it got flooded, disassemble it as you would for a battery change, dump the water out of the barrel if necessary, 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 seaweed or yucky old piss when you go to use it next. Besides, salt (from seawater or pee) can't be very good for the insides.

There are some circumfrential grooves cut into the barrel, a rubbery collar on the bezel, and knurling (crosshatch-shaped texturising) on the tailcap, so retention (the ability to hold onto the flashlight when your hands are cold, oily, or soaked with water or pee) shouldn't be much of an issue.

Beam photograph (all 41 LEDs) on the test target at 12".
Light ***DOES NOT*** have that blue color as depicted by this photograph!!!
Light will appear a dim royal purple color to the eye.

Light is too short in wavelength to obtain intensity values.

Spectrographic analysis
Spectrographic analysis of the LEDs in this "flashlight".

Spectrographic analysis
Spectrographic analysis of the LEDs in this "flashlight"; newer spectrometer software & settings used.

Spectrographic analysis
Spectrographic analysis of the LEDs in this "flashlight"; spectrometer's response narrowed to a range between 380nm to 420nm to pinpoint peak wavelength, which is 396.792nm.

USB2000 Spectrometer graciously donated by P.L.

Test unit was purchased on Ebay on 11-13-06, and was received on 11-24-06.

UPDATE: 12-14-06
From an email somebody sent regarding this product:

One thing that I think would be worth mentioning is that the UV LEDs get REALLY REALLY HOT after a period of continuous usage. This could possibly be an indication of overdriving (however, I wouldnt be surprised if EVERY UV led flashlight is being overdriven). Very powerful light however. Can't believe it was so cheap (especially after being shipped from the Hong Kong)

UPDATE: 12-14-06
No, you aren't seeing things.
Yes, a same-day update.
I have confirmed that the LEDs in this light do get rather toasty after just one minute of operation. This was determined by removing the lens ring & lens, removing the LED board, and feeling the bottom of it. The solder pads on it were rather warm when felt approximately one minute into its operation.

Temperature on the bottom of the PCB was measured at 110F (43.3C) after just over one minute of operation.
Ambient temperature for this test was 76F (24.4C).



    PRODUCT TYPE: NUV LED flashlight
    No. OF LAMPS: 41
    BEAM TYPE: Medium spot w/soft fall-off to perimeter
    SWITCH TYPE: Pushbutton on/mode change/off on barrel
    CASE MATERIAL: Aluminum
    BEZEL: Metal; plastic window protects LEDs
    BATTERY: 4xAAA cells
    CURRENT CONSUMPTION: Unknown/unable to measure
    WATER- AND PEE-RESISTANT: Splash-resistant at minimum
    ACCESSORIES: Wrist lanyard
    WARRANTY: Unknown/not stated


    Star Rating

41x UV LED Flashlight *

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