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Overhead projectors are wonderful for short demonstrations, but problematic
for sustained exhibits. Most use very inefficient incandescent sources,
with lots of heat and short bulb lives (50-100 hours). I've seen a few
more efficient models with 750-hour metal halide bulbs, but they're
extremely bright rather than low energy.
I'd be very interested to hear if anyone knows of overhead projectors with
efficient, long-lived bulbs (comparable to modern data projectors), or has
found or developed a good, high efficiency retrofit.
Thanks,
Richard
On Wed, Jul 11, 2012 at 12:57 PM, Eric Siegel <[log in to unmask]> wrote:
> ISEN-ASTC-L is a service of the Association of Science-Technology Centers
> Incorporated, a worldwide network of science museums and related
> institutions.
>
> *****************************************************************************
>
> Right steve don't forget the Joshua Light Show!
> On Jul 11, 2012, at 10:45 AM, Steve Fentress wrote:
> >
> >
> > We have an ancient "Unique Lighting Handbook" by Edmund Scientific that
> > has recipes for dropping dyes into a pan of liquid on an OH projector for
> > multimedia happenings.
> >
> Eric
>
>
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