a 4x4 will be covered by a Phillips 315 watt CDM 4K will work for both veg & bloom ! & runs pretty cool !
$400 bucks Ballast, wiring, Bulb..... I have 3, 1 in veg & 2 replaced my 1000 hps due to too much heat ! & lower cost running.... I don't have any issues now & don't even vent the hoods.....