Opie, I would shy away from plexi simply because I don't think it could take the heat.
'Real' (read: stuff you can buy lol) reflectors use tempered glass.

If you are already running an air-cooled reflector, you might try jacking up your air flow rate. When I was getting mine set up, I ended up having to use 2 inline fans to move air because the exhaust duct was 25 feet long and had a couple sharp bends. Just a thought.

Where is the air going when it leaves your hood? Are you exhausting it within the grow area, outside the grow area, outside the BUILDING...???
stinkyattic Reviewed by stinkyattic on . Plexiglass heat shield? I looked but didn't find much info on this. Does anyone have experience with using a plexiglass heat shield between their light and the plants? If so... The section of my closet in question is about 3 feet by 3 by 9 tall. At the top is a large carbon scrubber, and air is pumped in from two places; one at about 2 feet from the floor and one at about 4 feet. This section of the closet is fairly tightly sealed. 1) How much space (gap) should I leave between the edge of the plex and the Rating: 5