Calcium metabolism in pixies and pacman is much similar to that of snakes. They do not require UVB or the addition of D3 calcium suppliment. If you were talking about bearded dragons, you would be correct.
That being said my pyxies were grown to complete full size with no issues whatsoever within rack systems. With the only light provided being the flourescent light that lights the room. They require no UVB. Not sure where you came across different.