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Re: [OM] Lighting close up photos

Subject: Re: [OM] Lighting close up photos
From: "Giles" <cnocbui@xxxxxxxxxxxxx>
Date: Thu, 30 Apr 1998 16:07:48 +0000
> From:          "John Petrush" <jpetrush@xxxxxxxxx>

> Stuart Goggin <SGOGGIN@xxxxxxxxxxxxx> wrote:
> 
snip
>
> >Next project will be a battery powered version of these using 12v 6.5AH gel
> >cells for use outdoors.

I had a desire for a "bright" torch a few years back and constructed 
one using a 50w Qh bulb - the sort with a built in reflector - and a 
7ah gell cell.  It is like having a car hi-beam headlight in torch 
form.  I have thought that it could be quite useful for photography 
as the bulb is housed in an aluminium cell which a 55mm filter just 
happens to sit very nicely on.

Now what would be the correct filter to afix to colour correct the 
light?

81 A, B, C or none of the above?

I have a 55mm 81 A so it is very unlikely to be the correct one 8-)

A couple of pointers - the bulbs get hot - construct accordingly - 
metal, ceramics, tempered glass - those sorts of things.  Forget 
using plastics, silicone rubbers etc.  You will not want rain to come 
in direct contact with a bulb or its reflector while it is hot.  Use 
bulbs with a glass front to minimise UV exposure as these bulbs give 
off quite a bit .  Gel cells require finesse when recharging if they 
are to last any length of time so you will probably want to budget 
for a special charger or build one as I did.

Giles

> >
> Outstanding!  I am looking forward to your update on the gel cell setup.

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