Those heat lamps are useful to help with ambient temps but can wreak havoc on your humidity levels. If you do use one, I would put it on a dimmer and adjust it accordingly, this way it is not running at full power 24/7. Here are some things I did with my glass setup.
I live in Phoenix, AZ so humidity was a challenge at first with a glass set up. Here are a couple things you can do if you run into anything similar.
1) Switch to Eco-Earth as your substrate, does a wonderful job holding humidity.
2) Insulate your tank. I used the stuff below, I only put it on the bottom of the enclosure. With this same material, I also cut out a cardboard box that would fit perfectly on the cool side of the tank, then took two pieces of insulation on each side of the cut out, and tapped it with foil tape.
3) Make sure you have an accurate hydrometer and thermometer.
4) Make sure if your using a heat lamp, put it on a dimmer or a thermostat if you can. I ran a Herpstat 2, one probe for my UTH and another probe for my lamp. This will prevent your lamp from running full power 24/7 and totally zapping your humidity.
http://www.homedepot.com/p/t/1000208...5#.UgxI8qa9LCQ
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