You'll have to research the results others have had with violet/purple LEDs over their reef tanks. I have never used them so I can't say from personal experience. Lights in the 420nm to 470nm range (violet to blues) are supposed to be more efficiently used in photosynthesis, so 420nm violets should be good but again, no personal experience.
I use 445nm & 455nm blues, 6500k, 10000k, and 20000k whites on my big unit. Debating about whether to retro RGBs in.
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