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The ones I've seen are more for fish keepers and maybe for shy fish. Blue light penetrates water better compared to red light but on mine they have never added much.
I run a blue light in the late evenings, the fish calm down and disperse, finding their night time spot before the lights go out for the night. I don't know if the fish benefit from it but I like the look. The Plec comes out more in the blue light.
Not a good picture but you get the idea.