Hi i am having the same problem around 3 hours before lights go off they start droplling i got 1000 watt medal halid and its 3 feet above my plants with a cone shader,,, i have 21 plants and they are together and each about 7 " and i planted it on nov 9 seedlings then second batch of burmese kush on dec 6th on nov 9 i planted pruple skun x dutch .... is it cause maybe over watering , i adjuisted my light to 3 feet after it was at 2 feet....ummm and some of my plants got like not spots but like light spots on then 1 or 2 trees , like little rectangle lookin patch ;... and what do you think my ph shoudl b and is it bad if its constaly going from 6.0 = 6.8