Money Detect Light, retail $3.98
Manufactured by (Not stated)
Last updated 11-12-07

This is another in a widespread proliferation of ultraviolet and near-ultraviolet (NUV) "money detector" lights. This model has a 405nm 5mm NUV LED in it, and an aluminum body containing four LR41 button cells powers that LED.

It comes equipped with a spring-loaded "lobster claw" type keyring attachment; this makes it easy and trouble-free to carry around and have with you at all times when you're away from home - assuming of course, you remembered to bring your keys with you.

Its primary purpose is to check paper currency for the UVA-sensitive anticounterfeiting devices concealed within it.


This light is ready to use as soon as you remove it from the package.

Press and hold in the button on the side of the barrel to turn the light on and keep it on for as long as you need. Release the button to turn it off.

Tte product comes equipped with a spring-loaded "lobster claw" type keyring attachment; you can easily clip it to and remove it from your keychain without fumbling with all those jangling keys.

To change the batteries in this light, unscrew the two halves of the light (holding the portion with the switch and LED so the LED is pointed at the floor), and set the rear portion aside.

Tip the barrel into your hand or over a garbage can or a recycle box, and get rid of the four dead LR41 cells inside there.

Stack three of the four new LR41 cells onto a table or other flat surface, button-side (-) facing up. Lower the light's front half over them, and slide the now-full barrel to the edge of the table and into your hand (don't let all those batteries fall out and go all over the floor!), and then turn the light so the open end of the barrel is now facing up and the LED is facing down. Lay the fourth LR41 cell on top of the others, so the button-side (-) negative faces down.

Screw the rear half of the unit back on, and be done with it. Check the light to be sure it works; if it doesn't, you probably got one or more of the cells in there backward.

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

These lights are reasonably durable, but not HIGHLY durable. And they're not very waterproof, so please try to keep them out of sinks, toilets, fishtanks, snowbanks, or other places where water might be found. If it gets wet inside, take it apart and let the pieces dry in a warm, dry place for a day or so.

The LED in these lights appears to emit a peak wavelength of approximately 405nm; I might have preferred an LED with a peak emission wavelength of 395nm or lower.
That's why you don't see a "money shot" here - not because I'm broke, but because the LED's emission wavelength is a bit too long to illuminate the anticounterfeiting strip in $20 and $50 bills well enough to photograph that show the strip fluorescing.

Beam photo at ~12".
UV output is too low in wavelength to be measured.

Photograph shows a bright magenta color that does not actually exist.
To the eye, the product's light beam has a deep royal purple color to it.

Photograph of the three uranium glass orbs that were furnished with the flashlights.

Spectrographic plot
Spectrographic analysis of the LED in this flashlight.

Test units (three of them) were purchased on Ebay on 08-05-05, and were received on the afternoon of 08-15-05.

Flashlights were made in China. A product's country of origin really does matter to some people, which is why I published it on this web page.

UPDATE: 00-00-00



    PRODUCT TYPE: Keychain "money detector"
    No. OF LAMPS: 1
    BEAM TYPE: Wide spot with slightly dimmer corona
    SWITCH TYPE: Pushbutton momentary on/off on barrel
    BEZEL: None
    BATTERY: 4xLR41 button cells
    CURRENT CONSUMPTION: Unknown/unable to measure
    WATER RESISTANT: Splatter-resistant at maximum
    ACCESSORIES: 8xLR41 button cells, spring-loaded "lobster claw" clasp
    WARRANTY: Unknown/not stated


    Star Rating

Money Detect Light *

Do you manufacture or sell an LED flashlight, task light, utility light, or module of some kind? Want to see it tested by a real person, under real working conditions? Do you then want to see how your light did? If you have a sample available for this type of real-world, real-time testing, please contact me at

Please visit this web page for contact information.

Unsolicited flashlights, LEDs, and other products appearing in the mail are welcome, and it will automatically be assumed that you sent it in order to have it tested and evaluated for this site.
Be sure to include contact info or your company website's URL so visitors here will know where to purchase your product.

WHITE 5500-6500K InGaN+phosphor 
ULTRAVIOLET 370-390nm GaN 
BLUE 430nm GaN+SiC
BLUE 450 and 473nm InGaN
BLUE Silicon Carbide
TURQUOISE 495-505nm InGaN
GREEN 525nm InGaN 
YELLOW-GREEN 555-575mn GaAsP & related
YELLOW 585-595nm
AMBER 595-605nm
ORANGE 605-620nm
ORANGISH-RED 620-635nm
RED 640-700nm
INFRARED 700-1300nm
True RGB Full Color LED
Spider (Pirrahna) LEDs
True violet (400-418nm) LEDs
Agilent Barracuda & Prometheus LEDs
Oddball & Miscellaneous LEDs
Programmable RGB LED modules / fixtures
Where to buy these LEDs 
Links to other LED-related websites
The World's First Virtual LED Museum
Legal horse puckey, etc.
LEDSaurus (on-site LED Mini Mart)

This page is a frame from a website.
If you arrived on this page through an outside link,you can get the "full meal deal" by clicking here.