well I dont want to say for sure, but the standard for the lumen brights is in the 14-16" range from the water surface, my 300 is the same dimensions as yours, I dont have them mounted on it yet but they are on my 120, these reflectors are great but kind of give you the spotlight effect, and that close to the water I think it will be more noticable, since you have the galaxy ballasts, you might could try the lumen max elite reflectors, I like both styles personally.