After a lot of discussion, the amount of reds that are needed in corals is very small.
For growth it's pretty much unnecessary. And has been done with just violets and biues but it looks bad to most folks. myself included.
I have built lights for years and had good growth and color but thought I was overdoing it. I took out reds, amber's and regular green years ago and never looked back.
In truth, I would lay odds that a custom rgb setup where the blues covered from 410 to 455, green from 460 to 560 and red above that you could color kid and do everything necessary. Obviously those aren't really rgb bulbs. But you get the idea.
For growth it's pretty much unnecessary. And has been done with just violets and biues but it looks bad to most folks. myself included.
I have built lights for years and had good growth and color but thought I was overdoing it. I took out reds, amber's and regular green years ago and never looked back.
In truth, I would lay odds that a custom rgb setup where the blues covered from 410 to 455, green from 460 to 560 and red above that you could color kid and do everything necessary. Obviously those aren't really rgb bulbs. But you get the idea.