I think this is a pretty good read discussing LED light spectrums.
- Marine Engineers
It fits in pretty well with a lot of the conclusions I've drawn since completing my LED build. If we look at the spectrum covered using cool white and royal blue LED's there are some noticable gaps in the green and red spectrum.
Similarly, my post-build conclusion was that using a ratio of neutral and cool white LED's would help fill out the spectrum and produce good PAR results. I also like the authors 3:1 ratio of white to blue although my post-build conclusion was a 2:1 ratio would be good to achieve a good 14k look.
The 'turquoise' LED's sound interesting too as a possible replacement for green LED's and of course he rounds it off by including some 420 nm true violet LED's.
One thing is for sure, the number of LED's being placed on the heatsinks would definitely increase by filling out the spectrum and the driver/controller configuration becomes more complex with 4-5 channels to adjust.