Hi guys, I dug through all of the threads and while I came up with several mentions of this problem, I came across no concrete solution. Hopefully someone can clarify.
I have a custom built projection setup with a 400W metal halide bulb, a fresnel, and a 5.6" lcd. I have the bulb actively cooled by a small fan. When It reaches full brightness, the system works fine for a few minutes and then the image dims. I read in some other thread that this is caused by the lcd polarizer degrading because of the IR heat. Apparently, you need some kind of heat absorbing filter or glass. I've searched for heat absorbing glass and hot mirrors, but have yet to turn up anything reasonably sized/reasonably priced. Could anyone give me a link to something good? Thanks.
-Jon
I have a custom built projection setup with a 400W metal halide bulb, a fresnel, and a 5.6" lcd. I have the bulb actively cooled by a small fan. When It reaches full brightness, the system works fine for a few minutes and then the image dims. I read in some other thread that this is caused by the lcd polarizer degrading because of the IR heat. Apparently, you need some kind of heat absorbing filter or glass. I've searched for heat absorbing glass and hot mirrors, but have yet to turn up anything reasonably sized/reasonably priced. Could anyone give me a link to something good? Thanks.
-Jon
Glass...
"Low E" Glass is your only real solution to the problem. It's used in some window designs for homes to keep out UV and heat. Goto any Window store and see if they can cut you a piece. Prices you see are for huge sheets... you wont need that. But, not all stores will and can do this for you.
"Low E" Glass is your only real solution to the problem. It's used in some window designs for homes to keep out UV and heat. Goto any Window store and see if they can cut you a piece. Prices you see are for huge sheets... you wont need that. But, not all stores will and can do this for you.
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