Those Temps are extremely cold for veg. You're going to get very stunted growth. Your plants should only be seeing those Temps in the last week of flower. Your humidity is great for veg. Cannabis plants love heat and humidity, it is the buds that hate it. Try to get your lights closer to the plants and get your Temps with lights on up to the mid 80s for veg and no more than 9 degree difference when the lights go off.
Good luck on growing, if you have any questions please feel free to follow me and ask me anything.
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