how does your statement contradict the statement that plants need a long night to flower. 12 to 14 hours of darkness would constitute a long night? the discussion here is about using IR to speed up PFR/PR conversion to put plants to sleep faster. normally this conversion and the shift from day time to night time activities takes 2 hours.if the conversion is sped up the plants can get as much work done and produce as much flowering hormone in a little less time. phytochrome simply acts as the plants time clock telling it which cycle to enter and where to produce cells.