I have experience with snakes and terrapins but haven't a clue about chameleons - I'll have to do some reading. Thanks for the heads up!
Ah! It looked like the cage was glass, but if it's mesh I can't imagine you would have a problem with air flow. You could maybe just leave a window open in the room to keep the air fresh. Milt spectabilis likes about 80-85% humidity. Do you have a hygrometer? What do you currently get in your setup?
I remember reading a thread on the board about the jungle dawn LED... I think this is it:
Lighting an orchid closet - fluorescent or LED? Otherwise?
I'm not an expert in growing under lights (I've only just started experimenting with it myself) but a couple of very experienced growers seem to be using them with success.