How many lux per square meter would you need to prevent flower? Reason: I am currently getting 12.5hrs of direct sunlight with 15hr days. Weather is applicable in my area until mid November at least. I want to keep my plants in veg until mid august, instead of normal flower times in 2 weeks.
Depending on the strain they'd finish out in proper time. If you wait too long and the strain has a full 12 week flowering, you'll run into frost and freezing(depending on location) and have to harvest before its fully matured.