Hi Brian,
on my chopped down light, the plastic tube the
wires run through is compressed under pressure
& equalizes the rest of the flashlight. So in
theory there won't be much pressure on the flashlight
seals should there be any air in the system. Maybe
you could do something similar or fit some
sort of flexible diaphram to it.
Alan
Sent: Friday, September 23, 2011 4:15
PM
Subject: Re: [PSUBS-MAILIST] instant dive
light
Had a bit of a malfuction with my mag lite dive light. After a day
of the light getting beat around in the surf I brought it home and laid it on
my work bench. When I went to pick it up I noticed a bit of oil
underneth it and it was very hot. I turned it on and it was still
working, so I opened up the battery compartment and poured out the remaining
mineral oil. I think my o rings are not sealing good. Three of the
batteries were very hot, the other three seemed normal temperature, one
battery had some discolouration. Obviously there was a reaction
taking place and a couple of the batteries were shorting, I imagine from salt
water.
Brian
On Wed, Sep 21, 2011 at 8:35 PM, Alan James <alanjames@xtra.co.nz>
wrote:
Hi Alec,
It was called a joiner Reducing 19mm x 13mm.
It's plastic, & I chopped bits off both
ends & sanded slightly to fit.
Part of a garden watering system found in the
local hardware store.
Only a few cents. Frank would have been proud
of me.
The flashlight has 3 modes, full, medium &
strobe. You cycle through by turning
the power on & off, however it seems to
reset after a short period of being off &
then always turns on in full mode.
Alan
-----
Original Message -----
Sent:
Thursday, September 22, 2011 10:31 AM
Subject:
RE: [PSUBS-MAILIST] instant dive light
Wow,
that is remarkable. May I ask what the piece is that you screwed into the
flashlight head? The one between the flashlight and the stainless
nipple.
Thanks,
Alec
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Well done Brian,
reference to how much pressure your bulbs
could take, but it's packed away somewhere.
Modifying one of these existing
lights seems easier & cheaper.
The flash light I gave the link to, I
was intending for submarine use. If simply modified for
diving, the switch being a"push in" type would possibly turn itself on
under pressure or not be
able to be plunged if you got all the air
out.
Regards Alan
-----
Original Message -----
Sent:
Wednesday, September 21, 2011 8:41 AM
Subject:
Re: [PSUBS-MAILIST] instant dive light
Hi Alan,
Just got back from the harbor, succsess !! I dropped it down to
around 35' with the light on everything seemed fine. It was
difficult filling it totally with no air bubbles, I had one tiny
one. I may try to put some silicone on the O rings to keep any min
oil from leeking by. The next time I fill it I'm going
to do it in a min oil bath so I can submerge the entire light in the oil
to get all the air out. Those xenon bulbs are apparently
pressurized, not sure if that makes a difference. don't know how
much pressure, probably not much.
I would like to make an led light as well.
Brian
On Tue, Sep 20, 2011 at 11:37 AM, Alan James
<alanjames@xtra.co.nz> wrote:
Hi Brian,
I got part way through making some LED
dive lights by modifying some $20- lights I bought off "Deal
Extreme".
900 lumen & free freight. They
operate off around 4 volts, so I'm going to link them in 3s to operate
off 12 volts. They have O rings at every join
& are made of a fairly thick
aluminum. I cut the body down & pushed a hose fitting in the
end, then soldered in wiring & put on a tube, ready to
oil
compensate. The LEDs in general take
tremendous pressure, I believe a similar oil compensated system went
down 10 kilometers.
Regards Alan
-----
Original Message -----
Sent:
Wednesday, September 21, 2011 3:30 AM
Subject:
[PSUBS-MAILIST] instant dive light
HI All,
I was pricing dive lights for the upcoming lobster season and was
floored by the outragous prices they charge for those things.
So I decided to take my 6 cell mag light, which has a xenon bulb in
it, and fill the entire thing full of mineral oil. The mag
lights have O rings at all the critical points of seperation of the
different segments of the light. I'm going to be dropping it
down to 40' today to see if the bulb can take the pressure. If
not then I'll most likely go to an LED mag light.
Brian
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