I use directional white heat light in a big cage like that and it is easy to provide a hot spot a tad over 100 degrees. I dont know if a 105 hot spot is widely recommended but it is what works for me as long as the cold side isnt over 80. I like to use reptocal since its d3 count is way lower than rep cal so i feel comfortable being more liberal with it. I dont think its known exactly what amount of d3 is ideal but this works for me. I hatched mine at home and they ate 15 or so crickets/superworms of an appropriate size daily but as soon as they reach the most of their adult size they seem to eat a whole lot less(3-5crickets/superworms a day) and maintain great muscle mass and grow still. hope this helps