Yes, a lots of resources say lighting is optional or you dont need any light. I came across an articles saying something like althought the pygmies are living low to the ground compare to other chameleons but they still get small amount of UVB from the sun. They recommened using a uvb 2.0 or a used 5.0. I started with old (more than half year used) UVB 5.0 but I find that it is kinda too strong so I go and brought a new uvb 2.0 which I think it much better for them. They seems to look comforty and sometime they like to stay at the top of the branches close to the light. I dont havebasking light for them. The ubv light give off enought heat from I live since they dont require a hight temp. Sometime in the hot summer day I might have to move the light higher to aviod getting too hot.