I use a simple dome lamp with a red bulb. I'm not sure about the wattage you would need for a tank so large, though. Maybe a more experienced member could guide you there...
Also, try draping a large towel around three sides of the tank and part of the top as well. The entire top of the tank doesn't need to be exposed or open if you are using a screen cover, just enough to allow some airflow so that the air inside doesn't get stagnant.
To keep my humidity levels up, I have a damp towel over part of the top, and I mist it a few times a day. It's about 55-60% humidity inside.
I hope this helps a bit.
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