Two weeks into November in Michigan

Will there be enough heat to finish flowering a couple plants that I started late? They have until between November 10th to November 20th before they r done. This would include a final 5-6 days with straight RO water. The temps aren't an issue as they are outdoor plants planted in pots cuz I knew they needed to be mobile for this reason and others so at night during a frost they get put in a shed. I'm pretty sure I can get the sun I need (I'll be getting about 7.5 hrs of direct sunlight during this time) but it's the temps that I don't know about. Any help would be great.

install a cheap 250w hps in a shed

give them a minimum of 10 hours 12 better

using Ro water is stripping out that vital minerals required in the final chapter

to up water with a 1/2 tsp of calmag each watering

good luck