Hello!
I've already made some comments in various forms, but I thought I would go ahead and introduce myself. I'm 23 year old female college graduate from California and my pets have mostly consisted of atleast one turtle. After my baby turtle passed away, I decided to go with something...
I would really suggest to get him a proper bulb with a tall log that he can move all the way up to. They should be able to get a LOT closer to that bulb then the set up you have....either that or bring the bulb lower.