Those lights are fine for veg but when it comes to flower more is way better. I have never got much bud from fluro's. My flower room now is 4 feet by 6 feet by 8 tall. I only use a little better than half because of dehumidifier and ballast. I ordered a cheap 1000 HPS and wasn't seeing the results I wanted. Then I just got a hortilux eye bulb and oh man it amazing how much better I am seeing results. You could use your whole space if you get like a light mover to go back and forth. There's more heat but way more bud. 3 feet is good if you get a 1000 HPS. Remember, if you go cheap you grow cheap. Someone else on here is teaching me that. Mylar is good.