Two kessils are like $800 arent they? And two Ai's are about the same too....Thats a really steep price, at least in my opinion. lol Unless of course you have that kind of cash and dont mind spending it on lighting for a fish tank. LOL
But seriously, the tao units are prettymuch the best bang for your buck so to speak. The only thing missing from them is a timer, which you can get at walmart for like $4 each. And of course a way to hang or mount them.
I;ve tried so many different types of lighting, I just invested in my first radion to see if all this high priced stuff is actually worth it in the end. I'm still on the fence though.