O.k, it`s quite hard to see clearly, but it looks to have been very dark in there, moreso if you`ve just added 6 more bulbs. The best way to supplement the illumination is with fluorescent tubes (just a household, not the "reptile" type), because the more heat you use, the more you`re drying out the air, though because of the water container it might not effect it quite so much?
I would keep the bulbs at one end, rather than all along as it seems in the photo (or maybe I`m mistaken)?