Appollo ufo 180watt led question

Any one have any info on this I got this led gifted to me so doing one auto flower under it , question I have is does anybody know the sweet spot height distance for this light during flower? I can’t find any info online for it ,, I know rough guidelines for distance for 100watt led but wanted a more accurate distance for this specific unit
Thanks in advance guys

Bump

About 15 to twenty inches if it has one

How'd this turn out?