Hey @Badger. 
If you haven’t seen this thread you should check it out.
This is the one I built for my 2x4. It’s running 21 strips, 15 5000k, and 6 3500k. There are 2 drivers, 1 runs 10 strips, 1 runs 11.
After I hung it I hit the strips and drivers with a temp gun. The strips were 78-79F, drivers were at 83-84F. Temp inside the tent rose from 70 to 72, and at 18" my LUX meter hits around 65K.
It’s bright as hell man, you gotta have shades to look right at it. This is 4 Frankenstein clones, 3 FPOG, and 1 mystery clone that I think is a Strawberry Diesel x C99.
You could build one that’d run at 165 watts nominal which is right at 20 sq/ft for $150-$160. It’s really hard to beat that. I’ll never buy another pre-made light.