River Rock 1xAA 1W LED Flashlight (2), retail $24.29 (www.target.com*)
Manufactured by (Unknown) for River Rock
Last updated 01-09-11

This is the River Rock 1 AA cell 1 watt LED flashlight. It uses a white Luxeon I LED, and has a mirror-smooth reflector protected by a transparent plastic window.

It comes in a mostly aluminum body, feeds its LED from one AA cell, and has a click on/off switch on the tailcap.

Because it uses just one cell, there is a DC-DC inverter somewhere inside to boost the voltage from the ~+1.5 volts produced by the battery to the +3.6 to +4.0 volts needed by that white LED. I attempted to use an oscilloscope to "see" the inverter, and could see the rapid waves indicative of such an inverter.

* Product was not found on the Target website, so this URL simply leads to their front door.


Press the dark grey button on the tailcap firmly until it clicks and then release it to turn the LED on.

Press and release the button the same way again to turn the LED back off.

There is no momentary or signalling mode available in this flashlight when it's off, however you can blink the flashlight while it is on by partially depressing either of the buttons. If you don't mind the backward or reverse feeling of this, you can blink the flashlight this way if necessary.

The flashlight comes with a neck lanyard, which can be affixed to the flashlight via a small hole in the side of the tailcap. It also comes with a bezel-up pocket clip, already attached.

To change the battery, unscrew and remove the tailcap, take it to a bridge over deep water (the Golden Gate Bridge would be ideal; however, the Juneau-Douglas Bridge would also suffice here), and throw it over the side so that it goes "bulb bulb bulb" all the way to the bottom of Gastineau Channel with all of the bowling balls that were lobbed over that bridge in the 1950s and 1960s...O WAIT!!! YOU'LL NEED THAT!!! So just set it aside instead.

Tip the used-up old AA cell out of the barrel and into your hand, and dispose of or recycle it as you see fit.

Slide a new AA cell in the flashlight barrel, orienting it so its button-end (+) positive goes in first.

Finally, screw the tailcap firmly back on.
Aren't you glad that you didn't throw that tailcap over the side of the Juneau-Douglas Bridge now?

This is what the Jueau-Douglas Bridge looks like...or what it lookED like anyway before it was replaced in 1976.

And this is what the bridge looks like now.

Current usage measures 722mA on my DMM's 4A scale.

The River Rock appears durable, and it is. I performed "The Smack Test" on it...after beating 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), only some gouging to the bare Metalgeogreymon - er - the bare Metalcalumon - um that's not it either...the bare Metalbeelzemon...nope, still trying...the bare Metalflamedramon...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 feces} up!!!) on the sides of the bezel and tailcap where impact occurred was found. No optical or electrical damage was detected.

The primary purpose of "The Smack 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 the poor, innocent, defenseless flashlight strikes the concrete.

I performed that dreadful suction test on it, and the tailcap held a good partial vacuum - but the barrel leaked some.
So weatherproof?
Submersible? For Christ sakes NOOOOO!!!!!

Beam photograph on the test target at 12".
Measures 427,000mcd on a Meterman LM631 (now Amprobe LM631A) light meter.

Photograph of the beam on a wall at ~10'.

Those colored graphics toward the left are my "Viva Piņata" posters, and that clock on the right that looks like a gigantic wristwatch is my Infinity Optics Clock.
You may also be able to see two of my SpongeBob SquarePants plush (Squidward Tentacles & Patrick Star) and a Digimon plush (Greymon)

Spectrographic analysis
Spectrographic analysis of the LED in this flashlight.
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 product was purchased at a Target store in Federal Way WA. USA on 07-16-09.

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: 02-03-10
I have given this light (plus two others) to my aunt; therefore I no longer have it at my disposal for future analyses or comparisons -- and the dreadful "" icon will now be appended to its listings on this website.

UPDATE: 01-09-11
My aunt broke by losing the spring in the tailcap while changing its battery; therefore I no longer have it at my disposal for future analyses or comparisons -- and the dreadful "" icon will now be appended to its listings on this website.
I gave her the Fenix L2P Flashlight in its stead.

Due to how the tailcap switch is constructed, conducting repairs using aluminum foil or other "spring substitutions" will be exceedingly difficult.

Reasonably durable construction
Decent size-to-intensity ratio
Uses a battery that's common and relatively inexpen$ive

Not submersible - this is what nocked the most stars from its rating

    PRODUCT TYPE: Small handheld flashlight
    LAMP TYPE: White 1W Luxeon LED
    No. OF LAMPS: 1
    BEAM TYPE: Medium spot w/soft corona
    SWITCH TYPE: Pushbutton on/off on tailcap
    CASE MATERIAL: Aluminum
    BEZEL: Metal; LED & reflector protected by plastic window
    BATTERY: 1xAA cell
    WATER RESISTANT: Yes - splatter- and weather-resistant at minimum
    SUBMERSIBLE: NO WAY HOZAY!!! way Hozay!!!!!
    ACCESSORIES: 1xAA cell, neck lanyard
    SIZE: 4.0" L, 0.9" D
    WEIGHT: 2.8 oz (with battery)
    WARRANTY: Unknown/not stated


    Star RatingStar Rating

River Rock 1xAA 1W LED Flashlight (2) *

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