[mike31154]

Not DIY, but Kessil & Orphek both use LEDs supposedly of their own design, specifically engineered with optimum colour spectrum for marine livestock. Probably not as many lumens/watt as a Cree, but lumens/watt are not necessarily the whole story for our application. If I'm not mistaken, the Radion uses at least one other type of LED, Osram, although that's for their Red LED which is really only for colour tweaking.