No flowers after 50 days, and those plants are certainly old enough to produce, you have a major stress problem going on, possibly a light leak in addition to the heat. And are you still giving them a lot of nitrogen?

Anyway check for light leaks.
stinkyattic Reviewed by stinkyattic on . HEAT! Could it be as simpel as out growing the growing room. Top of growing room ranges from 4~5 feet. Plants are now very close to 400w MH lights (inches). The room also averages 80F when lights are on. Is this just heat related or something else. The only option I have is to continue to top if so. See attached�� Rating: 5