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Turk
2007-02-17, 15:24
Book Owl LED headlamp.
available @ Chapters / Indigo book stores
price: $12.00-$15.00 CAD

1. measured weight 0.9oz without batteries unaltered out of box.

2. Photo for scale for those unfamiliar with CR2016 battery size. aprox dia of nickel, but thinner. 2 batteries weigh slightly less than 0.1oz

3. Removed stock O-ring and replaced with 11/16 spout O-ring. available at any plumbing supply. Replacement of the stock O-ring may not be necessary for most weather conditions. I changed it out to prevent failure in case of accidental full submersion in water.

4. Added additional bead of crazy glue to the outside of lens joint with main housing. Should provide additional margin of waterproofing.

5. Water Resistant Headlamp finished, with batteries weighing in at 1.0oz.

http://www.ehko.info/HQ_bo_headlamp.jpg

Headlamp pivots 90 deg and features simple spring tension clip.

** Test results to follow

tyro
2007-02-17, 18:27
Nice. I have a headlamp that looks exactly the same, except it has an Eddie Bauer label. It's my primary camping light and I love it. I haven't had any problems w/it, but I may try your mod for safety's sake. Thanks.

Mutinousdoug
2007-02-18, 00:08
Turk,
Why are you replacing the 0-ring? Age? size? would vaseline help the seal?
Next is "crazy Glue": It's a methacrylate (sp?) continues curing forever. Gets harder and more brittle with age. How about silicone RTV around the lense? (also ages but more slowly).
I have a "black diamond" headlamp that takes 3 aaa batteries that I haven't changed since I bought it in 2002. Use it to work on the car. Had to replace the wire between the battery pack and the lamp (PITA).
/Overkill.
I'm NOT::albertein

dropkick
2007-02-18, 01:30
I'm still having problems with the size of the battery.

OK, so it's about the size of a Canadian nickel.

At the current exchange rate (noon today) of .8593 that would make it the size of 4.2965 U.S. cents or more simply 4 and 1/3 cents.

I just have a problem imagining anything that size - where does the 1/3 go?

:aetsch:





I know it's an old joke but I couldn't help it.

Turk
2007-02-18, 12:40
Turk,
Why are you replacing the 0-ring? Age? size? would vaseline help the seal?
Next is "crazy Glue": It's a methacrylate (sp?) continues curing forever. Gets harder and more brittle with age. How about silicone RTV around the lense?

Only reason I changed the O-ring was I felt a slightly thicker body would
provide a more water tight seal. It requires slightly more torque to turn
the lamp on and off now, but I guess I just feel better that the gasket is
compressing.

The crazy glue was an arbitrary choice of sealer. Definately silicone would
be the better way to go, especially on higher quality or more expensive
lamp lenses. I don't actually think any type of seal was even required. But
I wanted some extra margin of defense than just the manufactured glue
joint.

Overall it took about 5 minutes and the total cost was under 20 dollars for
a really decent SUL headlamp. I am really happy with this thing. I may
go buy a few more just to have around. Have also found panasonic batteries
for it at the dollar store. 2 for a buck.

When i crunched the numbers against a good LW headlamp like Tikka or Zipka.
For equal weight in batteries. I have the SUL lamp coming out ahead by
about 30-50 hrs of usable light + the weight savings of the lamp itself.
Worth looking at... I think.

Turk
2007-02-18, 13:20
I just have a problem imagining anything that size - where does the 1/3 go?


the 1/3 of a cent buys comprehensive medical coverage. Even if that is your
very last nickel. Even if you are suffering from a self inflicted disease and
require immediate surgery at 2:am. It gets you a clean bed, in a real
hospital, where you don't stand in line.

It also buys racial equality. You can rest assured your children aren't
being brainwashed and trained as psycho-militant WASPS in an effort to wipe
out fellow countrymen of conflicting skin tone, or ethnic background because it is gods will.

It stretches a little further yet. That 1/3 of a penny buys you international hospitality. In countries where the mere mention of American Tourist buys you a one way ticket to an assault and mugging... a simple canadian flag pinned or sewn to a piece of luggage ensures unrivaled low-tech security.


It also gets you a beer with some real alcohol in it. Not some watered down camel urine they get US troops to grudgingly accept as a national standard.

:biggrin: :biggrin: :beer:

Iceman
2007-02-20, 18:26
the 1/3 of a cent buys comprehensive medical coverage. Even if that is your
very last nickel. Even if you are suffering from a self inflicted disease and
require immediate surgery at 2:am. It gets you a clean bed, in a real
hospital, where you don't stand in line.

It also buys racial equality. You can rest assured your children aren't
being brainwashed and trained as psycho-militant WASPS in an effort to wipe
out fellow countrymen of conflicting skin tone, or ethnic background because it is gods will.

It stretches a little further yet. That 1/3 of a penny buys you international hospitality. In countries where the mere mention of American Tourist buys you a one way ticket to an assault and mugging... a simple canadian flag pinned or sewn to a piece of luggage ensures unrivaled low-tech security.


It also gets you a beer with some real alcohol in it. Not some watered down camel urine they get US troops to grudgingly accept as a national standard.

:biggrin: :biggrin: :beer:

Wow, a few days and no debate... Must be some truth in the commentary...or?

Ok, Turk, I understand you are going to wirte up your studies of the light, but any idea about brightness level, any quick comment comparing the lights brightness compared to lets say an old fashioned 2AA minimag?

Turk
2007-02-20, 18:52
Ive been trying to figure out how to make a test that is based on
some standard of 'brightness'. Ive been looking at the way they judge
beam intensity and angle with other high end headlamps. But unfortunately
I haven't yet found the calculations for it. I am also missing some information
that seems key. I do not know the specs of the LED bulb in this lamp.

john pickett
2007-05-12, 20:24
Turk,
Is your lamp anything like this one? One oz. two CR2025 batteries, Twist the lens to turn on/off. Simple headband.


http://www.equippedtosurvive.com/dr_eq.htm