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300 $ Projector

You would be able to watch cable on it if you have a tv tuner card in your pc. Something like an ATI All in Wonder or a Hauppage tuner. Check the HTPC forum for a lot of help on those.

Then were you referring to how long you can leave it on in one session? The only thing you have to look out for is how hot the lcd gets since they don't respond well to the kind of heat the projector puts out. Notice how the tomshardware page shows how they had the lcd mounted above the lcd and not just sitting flat on it. Also they added a fan to move the air under the lcd to help keep it cool.
 
Found this page with a little more info:

http://www.louisville.edu/~wchall01/diyprojector/

I'm gonna build one of these things, really intriguing.

Question, if I get a 6000 lumen projector how much of that am I loosing pushing through the LCD? What actually makes it to the wall so I can compare this to other projectors brightness? I am assuming that the projector rating is with nothing on the display table...

In answer to the first post the bulb in the projector I am looking at is rated for 100 hours. Not a big deal for me as the bulbs are less than $20. This is one of the biggest things I like about this project, cheap bulbs compared to new projectors.
 
Check out these sites:

diyprojectorcompany.com
diyaudio.com
lumenlab.com

If I were you I would find a different light source, either retrofit a better light into the overhead projector or start building a projector from scratch. The bulbs in a projector only last a few hundred hours and cost about $20 but you can get a bulb that lasts tens of thousands of hours and costs about $50 to replace.

I'd recommend building from scratch, it won't be nearly as ugly as an overhead projector
 
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