New growth is always lighter Vs old anyway bud but kinda a lil hard to tell when it's lights off time just afore u shut it up take some pics with a normal light or flash it makes it easier to see the old hid lighting can make it difficult don't get me wrong easier than blurple LEDs but still proly a slight nitrogen deficiency if anything but need clearer pics to be sure
From what I can see all looks well.
Lighter green fresh shoots is normal....as long as the plant is healthy your fine.
Better light will help determine for sure....we want to see it just how you do.