I had them under a T5 for the germination process up until the third week. I recently transplanted into a 5g pot and now have all 4 of them under a 1000w ml using an eye hortilux bulb. I have 2 fans in the room moving the air around, one on 2 of the 4 walls. I also am bringing in fresh air from another room and have an exhaust fan pulling out through the lights so I don't have any heat issues. My room usually stays around 80 in veg with rh around 35-40. And I use AN veg nutes for watering schedule and add a bit of cal mag and b 52 when needed.