Run it at 100%.
Seedlings - 400 ppfd; 22 inches
Veg - 600 ppfd; 20 inches
Flower - 900 ppfd; 15 inches
This is assuming you're doing one plant. For two plants do 20, 18, then 13 inches. For this I assume the plants are each 6 inches to a foot away from the center of the light spread.
Bro Mars hydro 1000 at this point of the grow it doesn’t really matter that light is more than enough even at 6 foot higher than the plants I had enough times playing with these bad boys over and over you’ll need them closer during flower thou
I have the same model, at first in the seedling stage for the first week at 25% at a distance of 30 cm. Then I increased the power to reach 100% at a distance of 50 cm.