i just bought a fischer's cham. 5.0 linear uvb tube ( i used exo-terra as well ) and a regular incandescent housebulb, 40W-50W. my fischer's is housed in a 38g flexarium and it works fine. the only thing i dislike about it, is for a shy cham like a fischers, the shaking of the cage while getting the zipper opened may starttle him or stress him a bit.