Fluence has their spectrum as basically a 35k w/ a 660 boost (think they go about it differently though) & good results have been coming in. But I noticed allot of the better companies w/ results don't add 660 but do add 630. Some monos n some cobs. But spectrum is spectrum when adding to whites. I think the 630 in conjunction w/ the far refs gives the desired Yeild increase w/o the bleaching problem. I think I noticed that on Apache, BudMaster, Amare, & a few others, I forget right now, that are known for good results w/ a balanced spectrum preventing bleaching at any hieght.
I just harvested a comparison run & am not happy w/ the Hydroponics Hut which has the 660 + 450 peaks. The buds look funny. Not right & very little.
I have offered to do a comparison for any comp. w/ straight cobs vs. cobs n monos a few times. No one seems interested.
The real comparison I'll be doing soon is my HPS vs. my Amare. To me, my led weed looks allot different then my HPS weed.