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It's been three years since the original care sheet, http://www.tortoiseforum.org/thread-63788.html , and I think its time for a review and an update. A lot of new info has come to light over the last three years and new insight has been gained through numerous experiences. What follows is my...
Over and over I type up and answer diet questions and try to get people feeding the right stuff, but I find that the "norm" is grocery store food. Grocery store food is expensive, a hassle to obtain, and very low on the list of what is best for sulcatas. These tortoises are GRASS eaters. From...
Most of the problems with the zilla tubes were quite a while ago,and they reformulated the phospher coating to fix the problem. It's still a good idea to use a UV meter to make sure the lamps are safe and effective.
T5 tubes can broadcast through screen tops a d give off useable UVB for a out 20".
As Tom mentioned, T8 can still be effective but must be mounted closer to the tortoise and not mounted above a screen.
Screens block out 50% of UVB.
T5 have twice the output of T8