Trek 30 , retail $19.95 (www.tek-tite.com...)
Manufactured by TEKTITE (www.tek-tite.com)
Last updated: 01-26-08
The Trek 30 is a 3 "AA" flashlight that uses a xenon-filled incandescent bulb near the base of a texturised reflector. The body is ABS plastic and it has a Lexan lens bezel.
The beam is wider than is usual for a flashlight like this; the beam is also somewhat ringy but this would not usually be a problem in normal usage. Only if you're a "white wall hunter" would this pose any problems whasoever.
The unit is quite serviceable actually.
SIZE
Here's another flashlight you can just rip open the bag and start using almost right away.
My test sample came with the batteries already installed, so it was good to go immediately.
If yours doesn't install three "AA" cells (see below) before using it.
To get light, turn the clear lens bezel clockwise (as though tightening it) until the flashlight comes on; to turn it off twist the lens bezel in the other direction.
It is equipped with a pair of strap slots under the head to affix it to webbing or backpack straps.
To change the batteries, unscrew the clear bezel until it comes completely off, throw it to the ground, and stomp on it with old or used bowling shoes until it's smashed up into little bits like that couch that keeps stealing your change...O WAIT!!! YOU'LL NEED THAT!!! So just set it aside instead. 
If necessary, dispose of or recycle the used AA cells as you see fit.
Holding the flashlight somewhat upside-down (business end tipped toward the floor) when you do this will usually allow the bulb holder & reflector assembly to stay inside the bezel (lens assembly) so they do not become lost.
Insert three "AA" batteries, button-end facing up, into the barrel.
Lay the bulb holder / reflector assembly on top of the batteries, and screw the lens bezel back on.
Aren't you glad you didn't stomp on that bezel now?
To change the bulb when necessary, disassemble it as you would for a battery change.
Take the reflector assembly, and gently pull the brass base off the bottom.
Using your thumb, push straight down on the glass bulb envelope until the lamp falls through the brass plate.
Gently place the burned out bulb on the floor, and STOMP ON IT!!!! 
Or just dispose of it in a garbage can if you're averse to breaking things.
Push a new bulb up through the hole in the brass base, and place the brass base onto the bottom of the reflector, orienting it so that the glass bulb envelope goes in first.
Finally, reassemble the flashlight as you would when performing a battery change - see directly above.
This is a magnified image of the bulb itself.
You can find replacement bulbs at this link for $2.95 apiece.
Like many other Tektite flashlights, the Trek 30 comes in a tough ABS plastic case with a G.E. Lexan lens bezel.
It appears at least reasonably durable, and it is. Even though it is of all-plastic construction, Tektite flashlights are known to be durable. So I administered "The Smack Test" on it. When I performed that terrible smack test (ten whacks against a concrete sidewalk: 5 smacks against the side of the bezel and 5 smacks against the side of the tailcap), no damage whatsoever was found.
No optical or electrical malfunctions were detected either.
The Trek 30 is also sealed with two O-rings, and is therefore waterproof to 1,000 feet, so don't worry a bit if it falls in the toilet or if the kids plop it in the fishtank. You can see the O-rings through the sides of the bezel, making it easy to tell if it's sealed right or not.
So, "The Toliet Test" would just be an excersize in futility...I'd never be able to drown it in such shallow water.
The incandescent lamp is significantly brighter than expected.
As an incandescent flashlight operating from three AA cells, this is about as good as it gets. Intensity was measured at 101.1 foot-candles.
The brightest portion of the Trek 30's beam measures 101.1 foot-candles.
Photograph of the beam on a wall at ~10 feet.
Those rectangular graphic things in the upper left quadrant of this photograph are marquees from:
Atari ''Tempest''
Nintendo ''R-Type''
Super Tiger...er...uh...Konami ''Super Cobra''
Midway ''Omega Race''
Sega ''Star Trek''
Williams ''Joust''
Venture Line ''Looping''
Universal ''Mr. Do!'s Castle''
Jaleco ''Exerion''
Gremlin/Sega ''Astro Blaster''
Gottlieb ''Q*bert''
upright coin-op arcade video games from the 1980s.
That graphic toward the right is:
A "BIG SCARY LASER" poster sent by www.megagreen.co.uk
That clock to the right of the "Big Scary Laser" poster is an Infinity Optics Clock.
And those faint green spots are from a Laser Stars unit.
Spectrographic analysis of the incandescent bulb in this flashlight.
Beam cross-sectional analysis.
Image made using the ProMetric System by Radiant Imaging.
TEST NOTES:
Flashlight was received sometime in 2001, and was just found today (01-25-08) while I was looking for another product that required beam cross-sectional analysis. FWIW, that product was not found.
Product was made in the United States.
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:
PROS:
Durable construction
Waterproof
Uses cheap & common batteries
CONS:
Some people may dislike the twist-on switch mechanism.
MANUFACTURER: Tek-Tite
PRODUCT TYPE: Handheld flashlight
LAMP TYPE: Incandescent bulb
No. OF LAMPS: 1
BEAM TYPE: Wide spot with darker center
SWITCH TYPE: Twist-on bezel
CASE MATERIAL: Plastic
BEZEL: Clear lexan bezel with ribbed outer wall
BATTERY: 3 AA cells
CURRENT CONSUMPTION: Unknown/unable to measure
WATER RESISTANT: Yes
SUBMERSIBLE: Yes, to 1000 feet
ACCESSORIES: Alkaline batteries, wrist lanyard
SIZE: 7.25” (18.0cm) L x 1.2” (3.0cm) D.
WEIGHT: 0.50 lbs. (0.13kg)
WARRANTY: Lifetime
PRODUCT RATING:
TREK 30 * www.tek-tite.com...
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