When your Led is too powerful for your surface. Should I raise the Led's distance to plant and its intensity ?

If you want to save some cash then have it closer on lower power. I'd do a test 1st, check corners of your grow tent at the lower power and check your ppfd/dli depending on which one your working with. Then test again at the higher distance with more power, whichever one gives you the most even spread of light across the canopy is the one I'd go with. Eg if lower power closer setup the centre of the canopy reads 40Dli and the edges read 10Dli, and the higher power further away setup the centre is 40Dli and the edges read 30 Dli then I'd go with high power further away. Pretty wrecked so not proof reading my answer and it may not make any sense🤣.

If it’s only the 280 w lights from your diary that you’ve got going I wouldn’t be moving it so high by the looks of it you’ve got a few plants going under that light . If the plants aren’t showing signs of burn keep it low and watch it grow