I feel like every light is probably different. check the manufacturers specs and play around from there. if you want to shorten up bud sites, moving closer can help, and vice versa. pull the light away to stretch out. you got LED so you dont really need to worry about heat and burning your plant, but theres always exceptions to any rule.
You want as much light as possible so id just keep inching it down and checking back after some hours until you start to see your leaves taco'ing, then inch it back up till it goes away. Thats probably your sweet spot.