I run a 600w hps in a 2x4x5 tent, I use an enclosed air cooled hood and extract air right from the hood out of the tent with a cheap $50 6" air booster fan. I run the light less than a foot from the plants and canopy temps are steady 80*, with ambient room temps from 68-72
Hydro is a big step for your first grow, I highly suggest starting in coco/perlite in fabric pots. You can have a complete running ready to run setup for quite cheap.
600w Digital ballast w/ enclosed hood 2 bulbs - $200
Tent - $60
fabric pots/plastic saucers - $25
nutes 1L bottles / ph up down / ph drop test kit - $75
timer - $15
coco/perlite enough to make 20 gallons - $20
seeds vary, pretend 6 fem seeds per run - $50
oscillating fan - $25
measuring spoons for nutes - $5
Under $400 startup cost, my first grow, I ran free memphisto seeds autoflowers and paid for every piece of equipment the first run because I didnt have to put money is someone elses pocket to buy the stuff.
Hand waterring 6 fabric pots in coco/perlite is very easy and almost fool proof with hydro like results, if you use 30% perlite you may have to water every other day, increase to 50% perlite and you may be feeding daily.