the powersun is not a good bulb for chams, it is way to strong for their sensitive eyes. I have 2 panthers from previous owners, one had the 100w powersun. because it was too strong, he didnt bask properly, which means his digestion and other body functions never really got a chance to work properly.
if its for a basking area, stick with a 60w soft white house bulb, or a bulb designed for basking.
i think you already said you were using the 5.0 reptisun linear