I'm using the 125w (2 of them) dimmable LED
units from ebay. Basically the taotronics but some other guys brand. I got the red/green/white/blue lights but I don't know that the red/green are needed. That big green acro has been in my tank 2 weeks and every branch has new growth on it. The small purple one was a brown stick of dying coral in January and everythign you see is new growth, it came back to life and sprouted all that since I got the lights.