I'm also curious as to what thickness the glass was in the testing.
FastUno, I personally wouldn't recommend using an acrylic shield. That is what I tried initially. People told me it would warp due to the heat from the bulbs but I thought my design would prevent that as I'm exhausting most of the heat outside. Sure enough, the acrylic warped big time in about a month. Of course, it was only 1/8" thick, but I think even 1/4" would warp pretty fast. I'm sure it would allow better light penetration but at a higher cost due to the need to keep replacing it.
Has anyone performed tests with different types of materials such as glass vs. low iron glass vs. acrylic to see what the differences in light penetration are?
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