Yes, that's why I switched to the 5x5. Crowded! Usually do 3 rows of 3 plants and that still maxes out the 5x5. Could cram a lot more and do sea of green, but need to keep it below a certain number. The main problem with the 5x5 was getting enough light into the corners and the light that I got solved the issue 100%
Being in a 4x4 bed limits a lot of the versatility of moving plants around. If I wasn't in a bed, I would have done some more homework on 2 lights. There isn't any really good options at 5'. The corners are too low compared to the rest tent