my setup.....a 2ftx4ftx5ft yield lab tent : a 400w HPS with digital ballast under a 'gull wing' Al reflector: a 4ft 4tube 4bulb T5 HO @ 216w across the rear wall with 3 Bloom bulbs and 1 Grow bulb :1 24w T5 in 2 out of 4 corners running Grow Bulbs(hung vertically) for a total of 664w. one 190cfm exhaust fan : one 12in fan for cooling the 400w HPS : one 6in fan to help with air circulation. i germ and veg in a seed dome and a re-purposed bedroom chest of drawers under T5 HO lights. its not the most 'high end' set up but it works for me