Any good formula for aiming LED light bar?

Just got my light bar mounted yesterday and last night I went out the see how it was and it’s great. Be really nice if I was coon hunting since I can see all the tree tops! But really I just mounted it and that was it. It’s kind of a PITA to adjust so I don’t want to do it over and over. It’s a combo flood/spot. I know there’s certain formulas like 25′ away it should be approx. 1-2" below the mounted level etc. Just sort of wondered if that applies for a light bar as well?

I realize I should just wait until dark and put it where I think it looks okay but just wondered.