Effective coverage by a light mover

What is the general distance that a light mover can cover that would not have a decrease in yield? So for example if you have a 1000 watt light covering 5x5, if on a mover will it cover 7x5? 8x5 or more??If you had multiple lights slide them further apart and have the mover move back and forth? Or set the lights the same as you would have already had em set up if stationary?

I run one the full 8ft table for early veg. Over flowering plants I try not to let the lamp Go outside of it's coverage area. Ie... a 1k covering a 5 x 5 area might move 2.5 ft to either side. They work great.

Thanks for the info. That makes a decision to buy a couple of em a little easier. One for veg and the other in bloom running the lights back and forth.