All the literature I read says the plant’s nighttime must be completely dark during flowering.
I live in the city, with lots of light pollution: streetlights, neighborhood porch lights, etc. Not to mention the full moon every month. I have had no problem with my outdoor plants coming to flower after the solstice or growing nice buds under these conditions.
So what’s the deal?
Also, how do plants that grow near the equator know when to flower, when all the days are 12 hours long? I’ve had plenty of fine Colombian over the years, and did enjoy herb in Uganda a few years back. Both countries are on the equator.