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Hi:

We've used both overhead projectors and video projectors for different 
reasons.  I want to chime in on the money issue:  there's upfront 
equipment cost and daily costs....  

Nice overhead projectors are only about $250.  They use halogen bulbs 
and thus are warm;  they only last about 75 hours so we have them on a 
timer (but rewired the projector so its cooling fan stays on whenever 
there is power to the exhibit).  The one I'm using in an exhibit (on 
Photolithography) has space for two bulbs so you can slide a lever to 
the other bulb when the first one goes out.  The replacement bulbs from 
the office supply place are about $35 each, but I found them online for 
$4 each so they're 5 cents/hour.  WE have it buried inside a cabinet so 
kids don't have access to the actual projector.

Video projectors, which were also suggested, can run as low as $500- 
 plain projectors and bulbs have come way down in price in the past two 
years or so.  But the bulbs, rated for 2,000 hours typically, also cost 
$200 or more.. so thats 10cents/hour.

Kathy Krafft
Exhibit Projects Director
Sciencenter
Ithaca, NY

>
> Hello, all:
>
> We are checking out overhead projectors for a project we are working  
> on.  Are there issues with letting kids have access to these in an  
> exhibition setting? (heat, etc?)
> Any models work better than others?
>
> Happy Holidays to the ISEN hive-mind.  Thank you for all the help and  
> good ideas.
>
> A little holiday url:  http://www.youtube.com/watch?v=0aX8zw06kZ8
>
> Eric Siegel
>

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