Marks? Burns?

I recently bought a t5 and a 100w par 38 for my iguana and been noticing these marks on his back, kinda feel like it’s his stripes kinda showing but still concerned if the lights are maybe burning him? He likes to climb up and get close to the t5 but it’s not close to the basking bulb. I’m wondering if this is normal?, his basking area is about 10” from the bulbs and they sit on top of the mesh, but like I said he climbs up