Hello BigTuna and welcome to the boards.

You are making this LED light way more complicated then need be.

A plants growth of chlorophyll A peaks at abt 435nm (blue) and (660nm deep red)
It's growth of chlorophyll B peaks at abt 450nm (blue) and 635nm (red).

Anything else the plant needs is minor, or can be provided by supplemental lighting cheaper (such as 730nm, far red or even UV).

BTW, How do you know that a mfg in ShangHai, bum fuck China, really has a 660nm LED?
Don't trust them!

Just saw or realized you are giving up having them made in China and are going to build them yourself....just make sure to buy good diodes.
You should check out LedEngin, Inc.
OM