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Well, it's been like this...I haven't been home during the time my lights have been on for the last 2 days...which takes all the fun out of running the test.
I did just finally set up a piece under the lights, so I'll see what has transpired (or not) late Friday night (hey, it's the weekend, time for fun!).
Since one of my current 1/4" frames is spanning slightly over 20" and hasn't had any sagging issues, I do believe that a 24 inch one using thicker material will ultimately work out fine.
One nice item I found during my recent trip to my fabricator was acrylic square rods (in many different sizes). I especially liked these as they were crystal clear on all sides and I think those might work the best for your application of spanning the 26 inches. Just wish I had grabbed a piece of that...next trip out, for now we'll try the slightly thinner material.
Did you test with what you have yet?
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