This is the spectrum for the radion LED:
Jeff doesn't like violet but at the end of the day it is a way more efficient spectrum for chlorophyll A as the new current crop of violet semileds are very powerful.
Care fora bit of honest criticism??? First though to green vs cyan..
Cyan hits closest to one of the ancillary photosynthetic pigments (carotenoid ) and except for cyans.. all common LED's
are quite short in this bandwidth.. something you cannot say about green..Also cyan subjectively "pops" green much better than green, which is already abundant in white LED's... that is my partially subjective choice..
As to "purple". gus in your photos (though some shades of toning I "can" find acceptable.. I noticed purple "shadows". To me (and maybe just a digital artifact) it is "distracting" and unnatural..Needless to say I've never found reef tanks appealing enough to consider one..for much the same reasons.. which btw, is why i am here..
Different strokes for different folks...and I suspect you could get a good discussion w/ reefers re: the same cyan vs green choice.
I suspect for most manuf. it is more an economic choice than anything else..
It has nothing really to do with coral coloration (there may be some benefit with certain fluorescing proteins but it's minimal at best), but more to do with how the color of the light is perceived by your eye. Cyan and green LEDs help reduce some of the purple tint that you can see with royal blue and neutral white combos. Typically, 470nm blue does most of the work, but it can need a little assistance sometimes. It also makes the light brighter to the eye, as the eye is much more sensitive to green light.
Don't both(er) with higher greens, stick to cyan. All white LEDs have plenty of green, but have very little cyan.
True green is used in commercial fixtures because Ecotech could get true green from Cree instead of cyan. Everyone else has followed suit.
True green is NOT beneficial in color rendering or anything like that (especially since even cool white LEDs have plenty of green spectrum), but cyan is very important!