The temperature was around 81-82 with the 75 watt but it was just drying out SO quickly. The humidity was around 30 when I got home today. I feel bad. I shouldn't have listened to the vet and just bought a heat mat but I simply can't buy one at this time. Now I'm stuck with 2 heat lamps. One that is very small and one that is very large(It barely fits on top of my 10 gallon tank). I have 3 incandescent light bulbs. A regular 50 watt, a 50 watt that is flat on the bottom, and a regular 75 watt. What combination should I use?