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375nm LED PENLIGHT

375nm LED Penlight, retail 99¢
Manufactured by (Unknown)
Last updated 05-05-13

This is a small (penlight-sized) source of long UVA (ultraviolet type A) radiation, peaking at 382.770nm (this was spectrographically measured and is not the 375nm as advertised).

It comes in an aluminum pen-style body with a 5mm UV LED at the end where you might normally see a pen tip, and it feeds from a single AAA cell. Because of this, there is an inverter circuit inside to boost the ~1.5 volts from the battery to the ~3.7 volts the LED requires.

SIZE

Feed it a single AAA cell first (see directly below), and THEN you can go find that stinky old cat pee or check "invisible ink" hand stamps on customers at the door at that club you're employed as bouncer at.

Press the "pen cap" down until it clicks and then release it to turn the product on; repeat the same action to neutralise it (turn it off).

This "light" comes with a removeable spring steel clip; this allows you to clip the unit into a shirt or pants pocket and subsequently reduce the chances of your losing it. But at just 99¢, if you do end up losing it, no biggie...you need not take a second morgage out on your home in order to procure a replacement.

To change the AAA cell when necessary, unscrew & remove the top of the unit (where the pushbutton switch is), and set it aside.

Tip the "pen" into your hand, and dispose of or recycle the used AAA cell that falls out as you see fit.

Insert a new AAA cell into the barrel, orienting it so that the button-end (+) positive goes in first.

Screw the end cap back on, and be done with it.

Current usage measures 56.6mA on my DMM's 400mA scale.

This portable UVA radiation source appears to be reasonably durable, and it is. When I performed that terrible smack test on it (ten whacks against the concrete floor of a patio: 5 smacks against the side of the bezel and 5 smacks against the side of the tailcap), only some rather minor damage was found. There is some extremely minor gouging to the bare Metalbeezelmon - er - the bare Metalbeetlemon - um that's not it either...the bare Metalmalomyotismon...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 poop} up!!!

) on the side of the bezel where it was struck.

No optical or electrical malfunctions were detected.

Beam photograph on the test target at 12".

Photograph of the top of LED Hummingbird Wind Chimes fluorescing.

Photograph of the security strip in a US $20 bill fluorescing.

Spectrographic analysis of the LED in this radiation source.

Same as above; spectrometer's response narrowed to a range of 370nm to 390nm.

Spectrographic analysis of the LED in this radiation source; newer spectrometer software & settings used.

Spectrographic analysis of the LED in this radiation source; newer spectrometer software & settings used.
Spectrometer's response narrowed to a range of 370nm to 400nm to pinpoint peak wavelength -- which appears to be ~382nm.

Spectrographic analysis of the LED in this radiation source; newest (01-13-13) spectrometer software & settings used.

Spectrographic analysis of the LED in this radiation source; newest (01-13-13) spectrometer software & settings used.
Spectrometer's response narrowed to a band between 376nm to 386nm to pinpoint peak wavelength -- which is 382.770nm.

The raw spectrometer data (comma-delimited that can be loaded into Excel) is at http://ledmuseum.candlepower.us/42/375.txt

USB2000 Spectrometer graciously donated by P.L.

TEST NOTES:
Test unit was purchased on Ebay on 02-26-08 and was received on the afternoon of 02-27-08.

UPDATE: 00-00-00

PROS:
Wavelength falls within the long UVA range
Reasonably durable construction
Uses a battery type that is common & relatively inexpen$ive

NEUTRAL:

CONS:
Not very water-resistant

Unknown

Penlight-style UVA radiation source

5mm UVA LED

Pushbutton on tailcap on/off

Pushbutton on/off on tailcap

Metal

None

1x AAA cell

56.60mA

Light splatter-resistant at maximum

PIPI PÒMDETÈ W AP ITILIZE YON BWÒS DAN KI TE TONBE NAN TWALÈT LA, NON!!!

None

132mm L x 13mm Dia. (not incl. pocket clip)

38.50g (1.360 oz.) incl. battery

Unknown

Unknown/not stated

375nm LED Penlight *

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