See, that's part of the issue. Some are, some aren't depending on the type (brand) of bulb. I think I may have to order what I want, and then whip out a tape measure. Here's a link to a 48" T8 5.0 bulb http://www.drsfostersmith.com/product/prod_display.cfm?c=6016+6028+19108+6548&pcatid=6548...
For 2 enclosures (2x2x4)
I'm looking into getting this:http://www.hydroponics.net/i/134303 but finding a UVB bulb slightly worries me. I was looking into the http://www.drsfostersmith.com/product/prod_display.cfm?pcatid=18318&cmpid=07csegb&ref=3312&subref=AA&CAWELAID=525372455
zilla desert 50...
Here's a site to find all of Dr. Lisa Hazard's information. If you are questioning her work, I'm sure she can answer any questions either of you have: http://www.csam.montclair.edu/biology/bioweb/lisa_hazard_phd_assistant_p.html
I think they're both saying that white crusty things won't harm...