@Area 51, I’m thinking that your 40w psf is for HID lights. LEDs you will only need the SF7000. Get yourself a 4×4 tent for the SF4000. You can check out my Sk #1 grow under my SF4000 in a 4×4 tent. As they say, the proof of the pudding is in the eating, 
https://forum.spider-farmer.com/forums/topic/a-new-journal-of-my-old-skunk-1-grow-with-a-sf4000/
Hope that helps.
N2
+1
