9x 370nm UV LED Flashlight, retail $19.99 (http://store.advancedmart.com...)
Manufactured by (Unknown)
Last updated 07-27-10

This unnamed flashlight is an aluminum-bodied light that has 9 UVA (advertised as 370nm; spectrograpically measured at 394.80nm) LEDs in the end, powered by three AAA cells held in a side-by-side carriage in the barrel.

It is useful for the following purposes:
      Activation of fluorescent inks/dyes
      Charging glow in the dark fishing bait
      Examining artwork and glasswork for hidden repairs
      Small UV source will fit inside and behind objects
      Counterfeit money, credit card and ID detection.
      Scan during crime scene investigations for foreign materials
      Find uranation, sperm, and saliva stains.
      Cat & dog pee on rugs and carpets.

 Size of product w/hand to show scale SIZE

Like its 365nm brother, this light is quite easy to use.
Press the button on the tailcap until it clicks and then release it to turn the LEDs on. Repeat the same action to turn its LEDs off.

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

To change the batteries in your light, unscrew and remove the tailcap, dash it to the ground, and stomp on it with spiked golf shoes...O WAIT!!! YOU'LL NEED THAT!!! So just set it aside instead.

Tip the white plastic battery carriage out of the barrel and into your hand. If necessary, remove and dispose of or recycle the used cells if they are present in this carriage.

Insert three new AAA cells into the carriage, one in each compartment. Orient each cell so the flat-end (-) negative faces a spring for it in its compartment.

Once the carriage is full, insert it into the flashlight's barrel, aiming it so the spring on one end goes in first. Screw the tailcap back on, and be done with it.
Aren't you glad you didn't stomp on that tailcap now?

Total drive current is 139.40mA; this equals 15.48mA per LED.

The flashlight appears to be reasonably sturdy. Ordinary flashlight accidents should not be enough to do it in. I administered the smack test on it (I beat the the living tweedle out of it - ten whacks against the concrete floor of a porch; five whacks against the side of the tailcap and five whacks against the side of the bezel), and found the expected damage. There is some gouging and denting on the sides of the tailcap and bezel where it was struck. No optical or electrical malfunctions were detected.

The primary purpose of this test is not necessarily to see if the exterior of the flashlight would be damaged; it's more about the internal components which would be subject to a high shock load ("G force") every time it strikes the concrete.

The flashlight appears to be weather-resistant at maximum. When I removed the tailcap, relieved the barrel of its battery carriage, and then performed that dreadful suction test, some leakage was detected. It should be alright in light to moderate rain, but you don't want to drop this light into water -- a shallow-water landing should not kill it if you fish it out right away anyway.

This evaluation look an awful lot like the one I made for this product?
Thought you'd say so.
That's because they're quite similar in appearance and functionality, so I was able to use its evaluation as a template for this one.

Beam photograph on the test target at 12".

That bluish color is mainly fluorescence of the target itself;
the actual glow as perceived by the eye is a dim royal purple*.

Beam photograph on a nonreactive white surface at ~12".
This is not all that dissimilar to how the eye would perceive the light; though it is quite a bit brighter and bluer in this photograph than it is in reality.

That white & blue color does not really exist; the spot appears to be a very deep royal purple* to the eye.
Digital cameras have a tough time at these wavelengths.

* Yes, I know that the colors purple and violet are two different critters, but the phrase "royal violet" would not make very much sense; however, most everybody knows what "royal purple" looks like.
Purple is a mixture of red & blue; violet is a spectral color, encompassing wavelengths of ~390nm to ~410nm.

Photograph of security features of a bank card and a Washington
state ID fluorescing when irradiated with the unit.

Spectrographic analysis
Spectrographic analysis of the LEDs in this flashlight.

Spectrographic analysis
Spectrographic analysis of the LEDs in this flashlight; spectrometer's response narrowed to a band between 380nm and 410nm to pinpoint peak wavelength -- which appears to be 394.80nm.
Most UVA LEDs have a wavelength tolerance of +-10nm, so this is somewhat out of whack.

Spectrographic analysis
Spectrographic analysis of the fluorescence of a uranated* glass marble when irradiated with this light.

*"Uranated" - infused with an oxide of uranium, *NOT* piddled (urinated) on.
Commonly referred to as "Vaseline glass" because it has
a distinct pale yellow-green color when not being irradiated.

Note spelling: "urAnated", not "urEnated","urInated",
"urOnated", "urUnated", or sometimes "urYnated".

USB2000 spectrometer graciously donated by P.L.

ProMetric analysis
Beam cross-sectional analysis.
Image made using the ProMetric System by Radiant Imaging.

Test unit of this plus two other UVA products were sent by J.W. of Advancedmart on 07-22-10 (or "22 Jul 2010" if you prefer) and were received late on the afternoon of 07-24-10 ("24 Jul 2010").

UPDATE: 00-00-00

Small source of UVA radiation that is completely self-contained and portable
Uses batteries that are common and relatively inexpen$ive
Durable enough to withstand being dropped -- doing so would likely break a fluorescent UVA source ("blacklight")

UV LEDs of this wavelength are still somewhat costly -- though less than 365nm LEDs
Actual wavelength is much longer than advertised wavelength!
Has a Type II anodize, not the much harder Type III

    PRODUCT TYPE: UVA LED flashlight
    No. OF LAMPS: 9
    BEAM TYPE: Medium spot w/ diffuse corona
    SWITCH TYPE: "Reverse clicky" rubberised pushbutton on/off on tailcap
    BEZEL: Metal; LEDs protected by transparent plastic window
    BATTERY: 3x AAA cells
    WATER- AND URANATION-RESISTANT: Yes,splatter-resistant at minimum
    ACCESSORIES: Wrist lanyard
    SIZE: 99.50mm L x 31mm D
    WEIGHT: Approx. 140g (5.0oz) w/batteries
    WARRANTY: At least 90 days


    Star Rating

9x 370nm UV LED Flashlight * http://store.advancedmart.com...

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