Creating a bouncing intensity efx

I'm trying to create a bouncing effect using the intensity perimeter on a bunch of linear led fixtures. i want it to go (1,2; 3,4; 5-6; 3,4; 1,2) -- I can make a chase for it, then bounce it, but running it over 480 led fixtures would take until I got old. Anyone able to provide me some insight how I can easily create this effect? What am I missing? :aargh4:
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