Green LED Finger Ring Flashlight, retail $1.00
Manufactured by (Unknown)
Last updated 09-14-13

The Green LED Finger Ring Flashlight -- although sold as a novelty item -- is a surprsingly potent green LED flashlight that you wear like a finger ring.

The ring portion (the part that fits your finger) should expand (but in reality, doesn't expand very much!) to accomodate most any finger diameter. In actuality, I had difficulty fitting it to my pinkie finger for the photograph below.

It appears to be disposable; there does not appear to be any way to change the batteries in it.

 Size of product w/hand to show scale SIZE (on my finger)

Place the ring on your finger much like you'd put any other ring on. Orient it so that the LED faces forward (toward your fingertips) when putting it on.

On the right side of the ring's body, there's a spring-loaded slide switch. gently slide this switch forward (toward the LED) until the LED lights, and hold it that way for as long as you need light; release the switch when you no longer need the light.
This is momentary mode.

Slide the switch a little farther forward -- it'll stay in place and the LED will stay illuminated; slide the switch back toward you to neutralise the ring.
This is continuous (hands-free) mode.

This ring appears to be disposable; there is no obvious way to change the batteries in it when they poop out. So this section of the web page will not be necessary.

This was intended to be a disposable product, so even if you do manage to break it, just throw it away and go get another one. At $1 apiece, it certainly won't break the bank.

And at $1 apiece, I was rather surprised to find it has a nitride-based true GREEN LED in it. I expected to find red LEDs in it, but when I turned it on immediately after the vending machine purchase, it was that true green LED that prompted me to add it to this website.

Because this is a disposable ring and not a flashlight meant to be thrashed and abused, I won't try to drown it in the toilet, smash it against a concrete sidewalk, throw it against a wall, stomp on it, sit down hard on it, or otherwise abuse it. So this portion of the web page will be more bare than this section of the web page on a page about a flashlight.

It feels quite constrictive on even my pinkie finger, unlike other "expandable" rings I have used in the past.

Beam photograph on the test target at 12".
Measures 14,470mcd on an Amprobe LM631A light meter.

Beam photograph on a wall at ~8 feet.

Spectrographic analysis
Spectrographic analysis of the LED in this ring.

Spectrographic analysis
Spectrographic analysis of the LED in this ring; spectrometer's response narrowed to a band between 520nm and 540nm to pinpoint emission peak wavelength, which is 526.500nm (according to the data file linked directly below).

The raw spectrometer data (tab-delimited that can be loaded into Excel) is at

USB2000 Spectrometer graciously donated by P.L.

My two best friends P. Buff and P. Dexter (they're a married couple) gave this light to me as a belated Christmas present (my annual Christmas lunch with them was on 01-01-13); it came out of a vending machine at a Godfather's Pizza in Federal Way WA. USA. Therefore, the "" icon will appear appended to its listings on this website, denoting the fact that abusive (and potentially destructive) testing will not be performed on it.

UPDATE: 00-00-00

Somewhat longer than usual wavelength green LED

Definitely has a cheap or "chintzy" feel to it

Disposable -- that means you're throwing away a perfectly good LED when the batteries go to pot
Ring portion is rather small

    PRODUCT TYPE: Finger-wearable flashlight
    LAMP TYPE: 5mm LED
    No. OF LAMPS: 1
    BEAM TYPE: Somewhat blotchy mdium spot
    SWITCH TYPE: Slide on/momentary/off
    CASE MATERIAL: Plastic
    BEZEL: N/A
    BATTERY: 3x unknown-type button cells
    CURRENT CONSUMPTION: Unknown/unable to measure
    WATER- AND URANATION-RESISTANT: Light splatter-resistance at maximum
    ACCESSORIES: 3x button cells
    SIZE: 10mm T (without ring) x 23mm Dia.
    WEIGHT: 4.80g (0.170 oz.) incl. batteries
    COUNTRY OF MANUFACTURE: Unknown; though presumably China, Taiwan, or Hong Kong
    WARRANTY: Not stated


    Star Rating

Green LED Finger Ring Flashlight *

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