During week 12 all plants continue to get ripe and the leaves get more and more yellow fade. This is a good thing at this point, since that means the plants are FLUSHED properly and all BIO NOVA nutrients and sugars inside the plant-matter are used up. ONLY A WELL FLUSHED PLANT SMOKES SMOOTHLY WHEN DRIED!!! Since I plan to smoke these buds as my medicinal cannabis against my chronic back pain, I am extra keen on well flushed buds! All my genetic treasures GLISTEN WITH TRICHOMES NOW! Its a beautiful sight and makes me smile every time I see them. The aroma coming from the tent is overwhelmingly strong now and makes my mouth water. Since almost all the pistils have turned brown now, it is time to check the trichomes, if the plants are ready to harvest. I take a hand-held microscope and carefully look at a top-bud. The trichome-heads I see, are all milky now and some of them have turned amber. Thats the perfect time to harvest, since its PEAK-THC now. When all trichome heads have turned milky the THC-content is at its highest, when they start to turn amber, THC breaks down again. The more AMBER TRICHOMES you have, the MORE SEDATIVE a plant gets and then it will make you MORE SLEEPY when you smoke it. The SANlight EVO4-120 LEDs have done an OUTSTANDING JOB! The quality and amount of top-grade medicinal buds I have grown under them is MUCH BETTER THAN UNDER HPS. I can only STRONGLY RECOMMEND the SANlight LEDs...the new EVO-series works GREAT! At the end of week 12 (=after 9 weeks of flowering) its time TO HARVEST MY GENTIC TREASURES!