If you have a jewelers loupe, look at the crystals on the leaves! When the trichomes have turned about 60-80% amber(light brown), they are ready to harvest!!!! Some Sativas are harvested when trichomes are milky, so they give off more of a head high. I let them go full term, until the amber shows!!!! The hairs dont have anything to do with the ripenesss of the bud! LOOK AT THE TRICHS!!!!