i have 1 plant, used 4 26 watt 100 equivalent 6500K 24/0 during Veg, and switched to these two cfl self/ballast bulbs. 65watt 2700k 300watt equivalent. they are massive, they weren't where the bulbs are sold, but where they sell the light up signs, like EXIT signs, isle 3 lol, but check them...