i have been growing for years and have never heard of keeping plants in the dark between veg and flower.... i have heard of changing the lights slowly like down by 1hr a night till you hit 12/12 to give them a smooth transition but i never do it and have never had any problems... the one thing i have heard is keeping plants in darkness for 2 days right before harvest to increase thc production but that one is a total myth

alot of people flush between veg and flower BUT your plant needs VEG nutes during the first 2 weeks of flower before you change to flowering nutes, so alot of people (including myself) never flush until we get to the pre harvest flushing stage

and yes there really is a santa :thumbsup: