I would say that the different wavelengths have a massive effect on the finished product. you only have to look outdoors for that. Plants use all that they can. If its only blue they will manage but they would be a million times better with continuous spectrum and added blue. Only blue I honestly believe changes the plant somehow, or deprives it so to evolves in some way. This relates to stress and stress creates mutations and cancer.

Ever noticed how some plants just die? Some genetics wont work under your lighting? If you eliminate the air, nutes, medium issues and you know everything is fine why is this?

If sunset is at 760nm somewhere around there then the red on the LED is not strong enough to replicate that. Perhaps a bad thing. Same goes for blue and dawn.

LEd grown cannabis seems to be tighter, with more resin, crystal and importanntly taste and strength. This can only be due to the extra red and blue wavelengths they have been receiving. Adding more continuous spectrum can only be a good thing.