@budman410
You can defo use 3 per 4x4 and get great coverage. We use 4 over whats actually more like a 3x5. I dont know how to make 4 wide fotops fit well over a 4x4.
As for diode if its just a matter of 25$ per board or about 900 for the entire order id go for the Bs.
How are those skinny fotops working out for you? Ive been thinking of getting a few in to play with.
Less spread but you can get more of them over your cannopy. Also easier to do red sup and similar with more even spread. How hard can you run that before you need a heatsink?
240 drivers: is what we got lying around also it gives you the chance to run side boards a bit harder. I hear the 240s is one of the less prone to break, according to the guys at hlg who have actual numbers on this stuff.