So lets say I have a 400 watt MH bulb about 8" away from a sheet of 3/8" cast cell acrylic in a fixture with a glass shield, and keep it at a reasonable temperature. What will be the fate of the acrylic over time?
Possibly some warping over a shorter term. Although this tends to happen regardless of lights or heat when you have humidity one one side of an acrylic panel that isn't cemented to the sides of a box/tank.
I have seen on a large 2000 gallon store display MH crack 1.25" acrylic though.
