I'm having trouble getting my basking spot in my 4x2x2 hot enough. I'm currently using a 100w bulb in a dome sitting on top of the cage and it's only getting the basking spot up to 85F. Would it be better to get another dome and try two 75W lights or go for a 150W light in one dome? I don't really want to put the basking light in the tank since I worry about the beardie touching the dome. Thanks!