The three position switch sounds good BUT where would a timer fit in, I would like to be able to time the light events rather than remember to switch. I have a question what would the light spread be? my tank is 7 fet long and all I have are soft corals. I was thinking if I were to get the 24 inch models and mount them front to back. How many would I need to cover the 3 feet on each side of the center glass brace?