Very nice setup man! I did something similar with a 250 bulb and scored 0.98 GPW. And I bet you'll get something similar.
Must say that IME the plants like it horizontally better during veg and early flowering (stretching). I think that the leafs up there would not have been curling with light from above.
I really like you setup, it reminds me of my old vert. Now lets see them buds explode, how ya like that SLH?
Is it the lighting in the photos or are the leaves a really dark green?
Nice setup you have there, wish I had a tent or two myself!
looks good!looks like you need to pull some fan leafs off for better penetration.too many leafs mean too much larf and decreased yield!