Im in the SE part of the US...until this year, I grew in a tent inside a closet where I controlled everything. Now, after a few weeks under T5 inside, my autos romp around in mother natures bright light with 550HPS at night. A cool spell moved in a few weeks ago, noticeably slowing down flowering & maturing. Still lush and looking good it appears it will extend the maturity date of all I grow including a lone photo alongside. Bout time to wall up part of my shed and turn on the heater.