Temp Questions

Im about 2 days into the flowering stage. My temp ranges from about avg. 75-65 but depending on outside temp can range from 83-70

What is the allowable temperature fluctuation and what is the ideal temperature fluctuation (that is what is the ideal daytime "lights on" temp. and ideal nighttime "lights off" temp); if I have my setup several degrees hotter or cooler, but the fluctuation from daytime to nighttime remains constant, will that affect my plants significantly?
 
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