A question from a fellow grower:
What if a plant doesn’t flower after having it under 18 -6 for two weeks lighting. I than put it under 16-8 for two weeks. I am going to ride this out because it take a long time to get here.
18-6 and 16 -8 will not cause a cannabis plant to flower. You need 12 solid hours of uninterrupted darkness to get your plants to flower. 18 hours of light and 6 hours of darkness or 16 hours of light and 8 hours of darkness is considered the vegetative light cycle, not the flowering light cycle. You need 12 or more hours of complete uninterrupted darkness for flowering.
Yupper! 
Hey @latewood and @MacGyverStoner can you flower in 14\8. Like what is the least amount of darkness. @irma1010