Re: Halogen or fullspectrum? HELP!
From: Uncle Al (UncleAl0_at_hate.spam.net)
Date: 03/22/05
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Date: Tue, 22 Mar 2005 10:14:11 -0800
Evchen wrote:
>
> Hello!
> I'm a swedish student working on a projekt which is creating moodlight
> for fairytailmoments for children and want a lamp that is bright
> enough to light up one person just like on a mini-stage, but my lamp
> will also have a function as cosy-light, I want to put filters around
> the light for colorchanges and maybe even make a possibility for gobos
> with shaped shadows.
A kilowatt light produces heat. Filters do not like being hot. You
need a transparent cooler in-between.
> I've thougt about halogenlamps, but the tend to get very varm, and
> need to be ventilated... so that's why I thought of
> fullspectrumlight, but they have a cold, bright and not-so-cosy
> light, but has good lightquality if you want to read in it.
Your choices for very bright white light are somewhere around
1) Limelight. The Fire Marshall will shut you down.
2) Arc light. Messy and hot.
3) Tungsten halogen
4) Short arc
5) Lucalux
6) Rare earth iodide-doped electrodeless mercury lamp with
microwave excitation
(6) has low heat and infrared emission for the visible light output.
It's expensive as all get out and still gets hot. All intense light
sources get hot. (5) is very good for output and price, though I
don't know how well it works for stage illumination. (4) Short arc is
fantastic - tremendous output in a small volume and especially good
for movie theatre projectors. (3) you know about.
Heat is the problem. That gives you three choices between the bulb
and the filter:
(0) Forced air ventilation. It's hard to se how you can get around
that.
1) Infrared mirror (cold mirror). Light goes through, heat bounces
back to the bulb to improve efficiency.
2) IR-opaque glass. You absolutely must cool the IR filter.
3) Circulating water IR filter, typically a little copper sulfate
plus other stuff. Heavy on infrastructure and prone to failure.
Your best bet would be the cold mirror. Be careful! It has a front
and a back and it only works oriented one way. I expect it must still
be cooled by blowing air.
-- Uncle Al http://www.mazepath.com/uncleal/ (Toxic URL! Unsafe for children and most mammals) http://www.mazepath.com/uncleal/qz.pdf
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