how long have they been flowering and to really be sure when to harvest u need a a microscope at least 100x to check the trich heads depending on how much of a heady high or a body stone. u want to see how milky ur trichs are. Clear is not ready simi cloudy smi clear more head if the trichs are real cloudy strong head buzz 50/50 cloudy/amber more of a body stone never let ur trichs turn fully amber this means ur thc is degrading and breaking down
nice plants for cfls