I guess that depends on how low the temps get but, yeah, low temps can affect growth but less likely a lockout. The biggest causes of lockouts are pH issues and nutrient toxicity from other related elements.Perhaps the major defoliation is causing too much N or something else. *shrug*
Glad you like your light so far...
Disclaimer: I still use HID and I'm NOT an LED expert. All of my LED knowledge is from other parties or research so I can't say from first hand experience one way or another. I also run a medical grow consulting business in SoCal.
things are budding nicely and nice and frosty too. how did you keep them so short? what height or how much veg time did you give them before 12/12? RKY