All you iguana owners who care,i've been into iguanas for 15 years,some years ago i investigated about so called uv transmitting glass>>(bio-glass).....etc. I came across an article(dont recall where) about a plexi-glass nick-named.. monkey shine.It turns out theres a company called (www.spartech.com) who carries a plexiglass called (solacryl suvt)-it transmitts 92% uv through it,its what is used in zoo's for reptiles and primates.This stuff works great up here in the northern area.If you can remove a window that receives sunlight and caulk/screw a piece of this in place,do it.Check it out at there website.If i recall,a 4' x 8' x 1/4" piece was $220+.