N def?

here are a couple leave pics.
-strain: bubblegum
-ebb and grow
-week 5 in flower
-botanicare pure blend pro
-1000w center of bulb is 16" above the canopy in a magnum hood

These leaves were pulled from the colas right underneath the center of the bulb. The plants further from the bulb dont show these extremes.
I think i overfed them at the beginning of flower, but right now i have it under control.

Trying to figure out if this is N def, heat stress (or bleaching), or natural life cycle changes.

5th week of flowering... could be N def, def not heat stress. id bet on P and K def tho, add a little N, but lots of P and K

plants right under the light will metabolize faster and use a little more food than the outer girls. no biggie unless it starts to be a real problem throughout the plant.