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Sorry I just meant that the light itself would only be moving 4 ft. The tank itself would be 6 ft.I did exactly what you thinking of doing on an 8' tank. LEDs did not even exist for practical purposes when I built it. I used a 250w DE metal halide light with T5 suplements. It worked well at keeping my electrical bill down snd controlling the heat in my canopy.
I used a light mover with the slowest ratio then available. It was much faster than what your invisioning. It would move back and forth across the tank a day while the MH was on. It was simple and reliable. I dont know how much benifit it would be on a 4 foot tank.
Amazon lists several. This one looks like what I used. Light mover