Light movers are pretty expensive, My goal was have 2x the lights for the job and then cycle them so that it is consuming the same electricity but provides more light and instead of moving a light across a crop just cycle between them.
I have 4x 1000w mars hydro LED lights
read up on PWM dimming, this is already doing exactly what you are trying to achieve anyway and most likely how your driver's dimmer function works out of the box. Its maintaining steady current but pulsing the diode on and off in the millisecond range so that it appears dimmer. if you try to do this manually my guess is you are going to burn out your diodes as they are not made to be run that way. at best case their lifespan will be way shorter.
you are not wrong with your thinking, just going about it wrong. with led's you also greatly improve efficiency + lifespan by running them at lower wattage. so you could achieve a similar goal by dimming them all to say 75% so you can lower them a bit, but you will need to experiement what work for you. I think if you dimmed them by 50% it will significantly decrease yields so that is probably too much.
what is the size of your space?
if you are using the current generation TS1000 those are only 150W lights not 1000. Look at actual wattage / draw, ignore the marketing hype.
Those arent the worst lights, but they arent the most efficient either. You need about 35-40 watts per square foot of space with these. So 2 of them will cover a 2x4 pretty good.
for instance I use HLG QB288 boards. most ppl run them at 120-150W each. instead i run them at 50-60W each and run 2x as many. so each 120W driver i would have 2 boards instead of 1.
i'm not sure you can rewire those mars boards but using a different method, i am suggesting that instead of using 2 of those to cover a 2x4 area at 150W each, use 4 of those in the same 2x4 space at 75W each. you will be using double the diodes, getting better spread and can get the diodes closer to the plants for better penetration.
however as noted this wouldnt be the best way to use off the shelf fixtures and would be kind of expensive. but if u DIY it you can see how you could run 2 boards on the same driver to accomplish same goal for a lot less.