Recently i had a 40 gallon breeder for my bearded dragron but i wanted more room for him. For my 40g i used a 150watt basking bulb and a 24 inch reptisun. What would i use for a 90 gallon tank, that would emit uvb and heat far enough since the 90 gallon is very deep
I would recommend a floodlight halogen. A floodlight spreads the heat out over a larger area and that would help with overall ambient temps of your tank. An elevated basking spot would help a lot. You really only need minimum of 1 spot to reach basking temps. The floor of the hot side could easily be in the 90's and you'd still be cool. It's actually nice that way so they have more choices of temps to choose from.
The ones your talking about, the uv/heat combo are mercury vapor bulbs. They've been having problems right now. They also don't give basking temps, so you'd still need additional lighting.