That's the part I don't get....if the Leaf gets more light, it gets more energy. If it get's more energy, there should be less drain. If their is less drain, the Leaf should stay green longer.
(in my mind anyway). So if I have 372 watts of T5, and 150 watts of HPS, the HPS by reason should Yellow first.
Damn my questioning mind.......are they done yet? :jointsmile:
You may have answered your own question. The one receiving more light, thus more energy may simply be developing faster. It reached a natural part of the flowering cycle before the HPS plants.