Re: bulb colorings explosion risk [chat]

["Willem-Jan Markerink" <w.j.markerink@xxxxx>]

On 24 May 98 at 12:30, Alistair I. Paul wrote:

> >If anyone is interested, I have a set of automotive IR-pass filters
> >laying here. They block nearly all visible light (you only see a very
> >faint red of the bulb), and with a night vision unit you can then see
> >the world at night as it were broad daylight....:-))
> >These filters are 7-8" diameter, intended for round lights.
> 
> Ah just what I am looking for! I spent last weekend fitting a 1.8kVA
> generator to the Cruiser to run a pair of 400W IR lamps, but I would much
> rather use 12V to run the lamps. Do you know of any aproximatley 300W to
> 500W 12V bulbs that could be used for IR lighting To give about 0.5Lux at
> 120meters??

I am not sure you can cram 500W into a normal round unit....somewhere 
there will be heat problems I guess/fear. 

However, I do know of extreme high intensity search lights, with
high-tech computer designed and aligned reflector/bulb, electronic
zoom (from flood to spot), and even a dazzle-mode (stroboscope). All
handholdeable, though not compact (indutrial gel battery type....one
can put it on the floor). 

This is military/SWAT-team stuff, and called Big Bertha....I believe
the equivalent is 6 million candles (ordinary search lights end with
500,000 or so). It is claimed to be the strongest mobile searchlight
on this planet.....

About US$3-4000, just to dampen your enthusiasm....;-))

There are two IR filters for this animal, one showing this faint red, 
and one completely invisibile. Add US$500 or so....8-))

There are lesser and more basic models as well, in the 1 to 2
million candle range, including 12V plug-in models (also auxiliary
gel or belt-pack NiCd). US$500-1000. Also with dedicated IR filters.

As for stock automotive stuff: IPF (Japan) goes up to 160W for both 
12V and 24V, and has a 210W bulb for 12V.
(btw, you think about the wire diameter you need for
12V-500W, didn't you?....;-)) 

Btw: what on earth are you doing with all this light on such a large
distance?? 


- -- 
Bye,

Willem-Jan Markerink


      The desire to understand 
is sometimes far less intelligent than
     the inability to understand


<w.j.markerink@xxxxx>
[note: 'a-one' & 'en-el'!]
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