My opinions. Stick with minimum 5' tent height. Tent height - pot height - light, filter hanging height - 1' minimum between canopy and light = amount of rema
I'll jump in with some thoughts. 1st with the tent I'd say to go no shorter than your choice...taller if possible. Reason I say this is that growing space (height) diminishes quickly after subtracting for pot height, height for hanging lighting and exhaust equipment. Bear in mind to allow some distance between the light and the top of canopy...say 1' minimum. Even with a 6' tent I've had to modify light hanging hardware to gain headspace. As linked in another reply the
viparspectra xs1500pro lensed looks like a good choice (150w). Currently on Amazon US with a $30.00 off coupon. For exhaust consider a 4" Delumee fan/filter combo. It's claimed to be 200 CFM, it's variable speed, and replacement filter cartridges sold separately. I own a 6" and a 4" and both have exceeded my expectations considering the cost. Lastly, with lower temps from the led boards it may be necessary to add a smal heater. Typically low to mid 80s F day temps are desirable.