Subject: PUPT: RE: Shadow Light sources
Date: Mon, 17 Jun 2002 14:43:03 -0400


Dang H*tmail. First; perhaps something like Scotchgard would make a sheeting 
screen more cleanable.  Now as for sources.  I've used 150 watt (and lower)  
clear old-fashioned bulbs in a clip holder with a non-reflector shields made 
by spraying disposable foil oven pans with barbeque paint. I use Philips 
"capsule" haolgen lights with Edison bases for workshops.  I've used 
overhead projectors in theatrical designs; ditto slide projectors  (even 
discarded fimstrip units) A reflectorless Fresnel instrument with a halogen 
bulb is also convenient.    Strong flashlights can do an impressive job 
under some circumstances. For big outdoor stuff, a 500 watt halogen work 
light withg the reflectors sprayed black is impressive.
It really depends on the effect you're trying to produce on the particular 
sceen you're using. The general rule is, the smaller the filament, the 
sharper the image under varying circumstances. I'm planning to make a holder 
for 300 EHD miniature halogen bulbs (2 pin base) sometimes used in overhead 
projectors and small theatrical instruments, with a "silent" 110 AC computer 
power supply fan to improve bulb life in a small enclosure.  The fan will be 
creating an updraft so it won't be subject to much heat from the bulb.  I've 
also been playing with 12 volt household halogens (60w).  I may wind up 
making my own sockets and powering them using an old toy train transformer 
set so it can't go above a safe voltage.







"That's the way to do it!"


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