Now that is a good idea !!! Captain cavemanIf water movement is very important to the growth of coral it seems that light movement might also be a contributing factor in the overall health and growth patterns that coral exhibit. I would enjoy seeing a test measuring the growth of coral in 2 identical tanks where one light is fixed and the other tracks across the top of the tank. If I were able to build one to test I think a wide fixed array of defused blue lights with a tight cluster of white that would slowly progress from one side of the tank to the other.