Your flowering plants do need complete darkness during the 12hr dark period. They will be exposed to whatever light you are using for veg, and it's not moon light.
Originally Posted by keylime
Plants are not "resting" during the dark period, in fact there is a lot going on. Plants during the photoperiod take in co2 and expell oxygen. When it is dark they reverse thier respiration and take in oxygen and expell carbon dioxide. Plus certian chemicals and hormones are created during the dark phase that control flowering and other plant functions, plus many other "light-independent reactions".
People "rest", plants are 24hr factories.
Moon light for most plants in nature will not effect them. But a female mj plant that is un-pollinated is not a natural occurence, and even moon light (such as a harvest moon) can be a plants last chance at survival, and may cause late flowering hermaphrotism.
Keep it civil please, gentlemen. -StinkyAttic