I have just got some funds from my institute and shall soon start working upon constructing a PFC.
Being an optoelectronics enthusiast who hails from an agricultural background, I have done some share of reading of literature on PAR, and, because of the same, I have been wondering about the aptness of the light sources which have been deployed in the PFC.
Grow LEDs are very variable in their nature and can be based in vitro analysis of components, rather than in vivo.
Most of my readings have come from this thread: https://www.reddit.com/r/HandsOnComplexity/comments/17nxhd/sags_plant_lighting_guide_linked_together/
I really recommend everyone to go through it. The insights offered are amazing.
In a gist, I have been thinking whether the LEDs deployed in the PFC are apt or not. If not, then I reckon we can come up with a basic composition of what LED sources should be used by an exhaustive study of the available literature on PAR, and, also, we can argue that, perhaps, specific LED arrays can be devised, than the available grow LEDs, with the arrays being constructed based upon the relevant photometric calculations, to have the precise amount of required energy from different wavelengths.
Since I have just started this thought-venture, so please guide me if I am talking gibberish :stuck_out_tongue