Black box led question

[Sexytang]

I have a 75g with one 165w blackbox led set at 14” atm what would be the best height for the best results at blues at 100

 

[Spare time]

16-24 inches would probably do well. Bulk reef did a video of the most popular black box led's from their black box royal and most with 100% on both channels were best at 24 inches.

 

[Uncle99]

Exactly where they are now.
Usually two are used for this size thank, but one will work.