in italiano: hey, the three days of darkness is a legend. think about it: resin takes days/weeks to mature, so even if it really produced more resin, it would still be immature and non-psychoactive. it would make sense if you were selling the buds, but only for aesthetic reasons, but with three days of darkness, you seriously risk mold formation.
on generic stress and THC.
the thermal shock doesn't increase resin production. it's always been believed that way because mountain weed has always had a lot of resin, but the reason is that the higher the latitude, the more UVB rays there are. there are UVB lamps for cultivation, but they should be used for a maximum of 2 hours a day.
cheers