Really, ohh ... Hmmmm... Thank you for pointing out my ignorance. Yes, my old one is indeed 2 channel. Too much info for my old brain apparently. Darn it- finally decided to just do the cheapo Chinese box. Now I will have to reevaluate. Leaning toward two V2+ 24 fixtures to cover my 150. That way if I end up down sizing I have a useful light or if one has an issue - I only have to cover 1/2 the tank.