Bahahaha!!
Now I've completed a grow I plan on experimenting
I'm going to run 90x water cooled CLU046 COBs at 20w (36V @ 0.55A) each per 8x4 area. So 900w per 4x4... at around 1300 PPFD (may or may not be a little higher because I'm water cooling and so COB temps shouldn't be as high).
That is top lighting.
Then I'm going to add 8x CLU046 COBs at 20w each passively cooled as side lighting per 4x4 (2 COBs from each corner). That should give me an extra 270 PPFD under the canopy.
I wonder how much I could grow per 4x4?
I was planning on doing a Cree CXB upgrade which would have cost several thousand £££ but the Citizens make it sensible to just go ahead and do it now