Setup

That will cause a shit ton of heat my friend. though 6 does sound about right I would test 4 to begin with then add more if needed generally most growers who grow for yield tend to use a light per plant but if you have a large space like that I would look into light movers if i was you and some powerful LED lighting to keep the temps down but yeah thats just me. I think a 600x adequatly supplies light to a 1.25m2 tent so doing the math to cover 13 you would need around 10 if I have worked that out correctly though im a stoner and about to go bed so thats the best i have atm im afraid haha look into telos lighting if you in uk leds are awesome now run for 50,000 hours