Sorry, when you said the regular reptisun I thought you ment the 2.0. Personally I like the active uv heat bulbs, and I have noticed a huge difference in the growth rate going back to a 5.0 bulb. Also, is your younger one eating ok? The reason I ask is that the arm waving behivor may be because the younger one is afrid of the adult he can see across the room. Just a thought, Jacob.