This doesn't need to be trial and error on your part. Many of us have already done the research needed to provide a tortoise the best environment possible so that you don't have to guess. Many of these same people have offered up solid recommendations for you in this regard. I, for one, would be happy to lay out exactly what I have as a set up for my now 2 year old sulcata. Here's a photo of him from a few months back. this was achieved here in the Oregon liquid sunshine.I do realize that that is the way it's going to have to be until I get it right. ATTACH=full]95755[/ATTACH]