Thank you so much!That length is fine. If you're concerned about the weight on the screen top, you can support the fixture on the frame on small blocks of 1" x 2" (or whatever you have lying around).
Simple UVB fixture supports
I have a similar lattice, but I used ceiling egg crate instead of dowels (but I like your dowels too).
Did you create the "trellis" yourself?Do you think I need a longer bulb and fixture for my cage? It’s not completely across like it doesn’t touch the corners diagonally but it is for the most part. I’m also not done with my enclosure yet that’s why there isn’t any branches inside yetView attachment 284023View attachment 284025