My cage is 36wide by 36high and 18deep - basking with 75w is 85-90 at far left but bottom of cage is 60 including far right of cage. I was thinking of adding a second heat lamp on the right side since branches aren't as high to increase heat to the cage. Any suggestion? Its in my basement which is 60 ambient. Would you consider an under cage heater or will this mess up gradients since ground would get too warm?