I'm currently working on a light for a 4x4. The goal is to get a pretty even 900-1000 µmol m-2 s-1 across the whole space running it at 500W or less.
The COBs are Vero 29, 3500K 80 and 90 CRI.
I took some measurements with an Apogee SQ-520 today. At 40cm distance, I get a bit over 1k in the...