help diagnose

Ripper seeds Zombie Kush, day 45 of flowering, they are supposed to be ready in 55-60 days. I'm noticing some upper leaves though not at the bottom that are turning an orangey rust color, now this strain will produce purple leaves from the Bubba Kush in the genetics, is this how it start's. It...

Growing in soil under HPS, temp around 77-80 with good ventilation and spacing. Midway in the flowering stage these little yellow spots starting showing up and eventually turned into this: Still a newbie, help please!