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IamN2pot
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I've been playing around with blackout curtains for those passive air vents in mine, and all grow tents. Here is a link to that thread. I would love to have a set of them tested in a tent with that Apogee light pollution sensor Dr. Bugbee uses and have the results posted here on the forum. If you have a sensor and a tent and would be willing to test a set of the blackout curtains, please drop me a PM. I'd be happy to mail out the extra set I made for someone to test and post the results, ...oh, and keep the curtains. 
