How many lights in a 24"x94"x70" closet?>?

So I have 15.6 sq feet, 2 feet by like 7.5 feet, and I am wondering hte best setup possible? I already have a 400w, so i'm thinking either 2 400w, or 1 400 and 1 600. A 400 and a 1000 might be overkill I guess?

Let me know what you think.

If I use the 50-100w rule, that puts me at about 64w/sq foot. I'm guessing because it's a wardrobe with a small ceiling, i should probably go towards the 50w side due to heating issues.

Advice?

I have almost the same closet size, im going with 2 400w hps with mylar on all 3 walls and it seems to be doing the trick but im doing a sog grow so my plants never vegg over 2ft.

Well i'm growing out of an old wardrobe, and the bar that i hang the lights off is only like 58 inches, so i'm doing the same type of SOG op, right from the clone tray to the flowering room, maybe 2-3 feet per plant, this is my first try .

I'm leaning towards the 2 400's to play it safe and to prevent one side of the closet getting huge plants haha.