Originally Posted by Gregcoyote
I think most lights, other than incandescent, work fine. I prefer using a cheap compact fluorescent, but I would use several. Chaeto does like a lot of light to grow at peak efficiency. But it doesn't care much about the spectrum of the light.
Algae, like all plants benefit from having a rest cycle. So the 24/7 lighting might not be benefiting you the way you think it might.
Yep, I agree and I'm 90% certain that's why my other macros haven't grown at all. But it's hard to argue that I haven't had good results from running my lighting this way where my caulerpa is concerned. My available space in the refugium has been filling to capacity every month, my nitrate is undetectable, and my phosphates have dropped to 0.