I'd say a little more than 12" in the center.... All lights tend to make growth longer in the center... With this light there are two sets of red leds on ether side of the mixed set in the center, these over lap each other at the center of the light.. The red leds at each end of the light do not have that red over lap... Less power shorter colas at the sides of the screen...
The overall stretch i can only attribute to strain, close in reflective panels maybe... They kick light back into the lower side growth of the colas.. Light that would have been wasted, now used.... Maybe the water being kept in the mid to upper 60s*f...
I knock off light blocking leaves near/at the top, every few days as i go... Did one time clearing of any potential light blocking leaves all the way down to the screen.... Will do that again and defoliate light blockers one more time ( lights on tonight..) will have before and after pics on Sat...
Still only using FNB as my fertilizer... When the nutes go over 1100+, i add back plain water, under 900ppm, add back nute solution to bring it back up.... I do ph the add back down to a 6, the buffers in the fnb then take the ph down to the mid 5s... I don't mind if the ph drifts a bit.... What ever i way i go, i always bring the water level in the igloo reservoir back up its marked level.... If i go over one way or the other, that's when the drain comes in handy... Drain off however much volume i need to readjust...
No record here for sure.... I'd be thrilled to hit a gram/watt.... That'd be 6 and 1/2 oz.... That would mean i could bake some Crow Pie for a few people... I'll be satisfied with whatever i get.... Maybe a little disappointed if i don't get a chance to throw a Crow Pie party....