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Hi Eric,

I've used various types of overhead projectors years ago in  
exhibitions to let kids project moire patterns, for example.

However, there is a tradeoff between having to use timers, extra  
cooling fans for unit heat, and ultimately, bulb life.

Given those concerns, is there any reason for you not to use a video  
camera + projection setup?  Any ambient light issues related to  
overhead projection would be similar to those with video projection.



On Dec 17, 2007, at Monday, Dec 17     12:05 PM, Eric Siegel wrote,  
in part:

> 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?)


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