Lighting for 75 gallon?

Hi, I have been reading through all the great information on the forum but it's a little overwhelming and after looking around for a long time I am still not quite sure what I need. (Please excuse the newbie question).

We just got a 6 month old beardie yesterday. She came with a 75 gallon tank, 4 feet long, 18 inches wide. The included lighting is a fluorescent coil bulb. I know that's no good. So I need tube lighting, Reptisun 10. I've gotten that far...

Questions:
-HO or regular
T5 or T8? Looks like T5 is right, I think?
-24", 34", or two 18s, or ?
-What fixture for these? Something I can get at say Home Depot, or reptile specialty?
-inside mount or top of mesh?
Also I need an CHE. Does brand matter?
I'm looking at Pet Mountain to order. Open to others though.
thanks!

I'd go with a reptisun t5 ho 10.0 46" tube light. It'll go over the whole enclosure and provide good uvb, if you want you can mount it inside so the screen wont block some of it, but generally you could sit it on top. https://www.amazon.com/gp/product/B013RNBXLQ/ref=oh_aui_detailpage_o05_s01?ie=UTF8&psc=1 This is what i use for the fixture. You can mount it inside im pretty sure

Great, thank you!! That was just what I needed to know.

On the CHE--100 watt or 150?
I was going to get a 100watt, but the manufacturer recommends 150 for a 75 gallon tank. But if I'm just looking to get a sleeping spot up to temp overnight, then 100 watt, yes? It goes down to 62 in that room at night.

100 watts would probably work or a 120, as long as it doesn't drop below 65 its fine.