I have the single T-5HO and I was wrong on my estimate of distance from the light. I just measured it with a tape measure and I am at 7”. The light does sit directly on the screen top as well. Maybe this picture shows the different levels better for basking.( I thought I did an ok job at giving him options for this.) the orange circles are his favorite spots to hang out and bask, the blue are his two sleep spots.View attachment 250565View attachment 250566
I am still going with a temp issue. Here is where that gets tricky though. You have to be very careful with the basking bulb and the distance to the cham with the wattage your using. Too high a wattage and he is high risk for a thermal burn. The front left of the cage is the spot I would be most worried about. I have my basking bulb lifted off the screen to prevent this.
As far as the cage it looks great and I love all the plants but he is going to be heavy and those plants are not going to provide the grip size and strength he needs. You need real branches. Don't add more vines.
As far as devices to measure temps. I run two therm pro's, a wired probe at basking, and I use a temp gun. What I have found is that the wired probe is about 3 degrees too low. My thermpros are in two different areas of the cage for ambient temps. Now with the temp gun. I hold it about 6 inches away from what ever I am trying to take a temp on. Because with mine I get very different readings based on distance.