PreSidian Solar Keychain Light, retail $4.99 (
Manufactured by (Unknown) for Radio Shack (
Last updated 04-11-12

(In reference to the little box I pulled down from a pegboard display at Radio Shack at 11:49am PDT on 03-13-09):
{sung like the Foreigner song "Feels Like the First Time"}
Feels like a flaaaaaash-liiiight...feels like a FLAAAAAAASH-LIIIIIIGHT
Feels like a flaaaaaash-liiiight...feels like a FLA

BREAK IN 50276


If I've asked this once, I've asked this 2,458,770 times:

Q: What kind of bunghole would make a solar-powered flashlight?!?
A: This isn't a solar-powered flashlight, it's a solar-RECHARGED flashlight!!!

This is a small (keychain-sized) flashlight that has a single white LED in its "business-end", but you never have to purchase disposable batteries for it or worry about losing the charger - unless of course you can lose the ***SUN***!!! You never have to wind it, and you never have to shake the living tweedle out of it either; just place it in a sunny (direct or indirect sunlight) location for a few hours or so and that takes care of that!!!


To use the Solar Keychain Light, charge it first (see directly below), and THEN you can ***NOT*** go set fire to the side of a lavatory factory three blocks away (it's not super-intense, but it's not useless either!!!)

To turn it on, slide the slide switch on the left side of the product forward (toward the LED).

To turn it off, slide the slide switch back toward the tail end.

There is no momentary or signalling mode available; please do not look for or expect to find one.

To charge the Solar Keychain Light, just set it solar panel-up in a sunny location, like the photograph directly below indicates:

Yes, it's really that easy.
Charge time is not indicated; but I'd give it no less than several hours.

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

This is a small keychain flashlight with a glass thing on its upper surface, not a flashlight made out of metal or sturdy plastic with no glass in it. So I won't throw it against the wall, stomp on it, try to drown it in the toilet bowl, run over it, swing it against the corner of a concrete stair, huck it at one of those wall-mounted porcelain uranators to see if it explodes (the flashlight, not the uranator), or inflict upon it punishments that flashlights made out of metal or sturdy plastic with no glass in them may have inflicted upon them. So this section of the Solar Keychain Light's web page will seem a bit more bare than this section of the web page on a page about a flashlight made out of sturdier material and with no glass in their construction.

Beam photograph on the test target at 12".
Intensity measures 19,900mcd on a Meterman LM631 (now Amprobe LM631A) light meter.

Measurement was taken while the internal batteries were in an unknown State of of DISCHARGE (there I go thinking about the heavy metal band Anthrax!)

I'll remeasure after the product has been charged in sunlight - this may be several weeks or more because I live in Federal Way WA. USA (not far from Seattle), and the sun may be awhile yet.

Beam photograph at ~15'.

Those colored graphics at the left (if you can see them anyway) are my "Viva Piņata" posters.

Spectrographic analysis
Spectrographic analysis of the LED in this flashlight.
Ocean Optics USB2000 Spectrometer graciously donated by P.L.

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

Test unit was purchased on at Radio Shack in Federal Way WA. USA on 03-13-09.

Product was 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: 04-10-12
I went to use this product to perform some additional spectroscopy of it -- and then had futile attempts to recharge this product in direct sunlight, and it...

(1): Failed to turn on.
(2): Failed to accept a charge

So I opened it up and found this:

I have no idea whatsoever where the red wire goes, so until I do find out and get this flashlight, I'll have to issue that dreadful "Failed or was destroyed during/after testing" icon to denote that the product has failed. I have attempted to find the circuit board layout or even schematics online, but my searching has been futile.



    PRODUCT TYPE: Solar-rechargeable flashlight
    LAMP TYPE: 5mm white LED
    No. OF LAMPS: 1
    BEAM TYPE: Medium spot w/soft fall-off to corona
    SWITCH TYPE: Slide on/off on side of product
    CASE MATERIAL: Plastic
    BEZEL: Plastic; LED & "reflector" protected by prismatic plastic piece
    BATTERY: Rechargeable cells, voltage 3.6 volts; capacity not known
    CURRENT CONSUMPTION: Unknown/unable to measure
    WATER- AND PEE-RESISTANT: Splatter-resistant at maximum
    WARRANTY: Unknown/not stated


    Star Rating

PreSidian Solar Keychain Light *

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