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I have not grown in a while, but i used to take cuttings and set them in a cup of water and just wait for roots to sprout. used to work really well for me, extremely simple. Anyways, i have some cuttings under some 4 48" T8's i think that is about 11,000 lumens, but the cuttings have not been rooting, I guess my question is, is it possible the cooler temps in my room are preventing root growth? It has been about 3 weeks now on some of the cuttings and still no root growth. Any help is always appreciated!!