Are they going to be in regular bat wing reflectors? I ran three 600 watt regular bag wing reflectors in my 4x8 run how your x’s are

the x.

Because of the 315w bat wing is the optimal coverage for this grid and hopefully you got De as they are a better throw of light for the watt, 630 cmh you can get a better ie bigger throw a little more but better overall , but 315w will get you there give or take half a week only because it's 315w BUT cmh spectrum has you covered, 630 guarantees you but you'd want a separate veg or dial down on a light mover or veg outside,

Me personally run an adaptable De 315w wing on 1.45m x0.8m no mover dimmed to 70% DWC year round on house air con

They pets to me lol