Alright man welcome to the site,your outdoor plants look sweet. Great choice of light I use them myself,check this thread for tips on GN lights n stuff https://www.autoflower.org/f43/grownorthern-manual-13528.html . When your dialled in your gonna be able to grow 5 or 6 oz under that light but one thing you need to be weary of is the height some of the plants are gonna get,the last plant I took down was 5ft,have a read about LST (low stress training) or ScrOG (Screen Of Green) they are simple techniques to keep the height of you plants manageable.