The first thing I do is the LED layout.
How do I have to distribute them to get as even coverage as possible over the entire area. Each spectrum and each color taken individually should cover the entire area as evenly as possible.
At the end all spectra and colors should mix evenly, no matter which of the diodes I switch on or off.
Does not make sense if one side is more warm white and the other cold white, unless you want that.
When I have done that, I think about which drivers are the most suitable. Do I want a separate Veg switch? Do I want to use the colored diodes permanently or only as kind of a bloom booster? Should it be dimmable?
I don't know how big your area is and if you want to use COB's and PCB's all together or not.
620w is probably for a 4x 4', isn't it?
At least I have to know if it is a rectangular or a square surface that should be illuminated.
For a rectangular area the layout could look like this:
View attachment 4164910
For a square area like this:
View attachment 4164911
Distributed in this way you could switch off for instance all the RBW's or all 50w CXB's and still have a nice and even coverage.