Yeah, lamps are not really needed and will just suck out humidity. The best thing to do would be to get some flexwatt or another UTH for the cool side on another t-stat or rheostat set for around 82. Your best bet long term would be to get a thermostat or two instead of the rheostat since rheo's don't last too long. ReptileBasics.com has the best prices I've seen so far on the cheaper stats, and Rich will wire them up for you himself.