I don't have any comparisons so can't really say if its had any impact but three weeks ago I switched the three 75 watt daylight bulbs to red ones, cut the main lights to 11 1/2 hrs and set the red ones to come on 15 minutes before and go off 15 mins after the main lights. The three bulbs hang equidistance between the two main lights and are plugged into a second timer.Originally I set this up so that if the power went out during the light period, then I'd have some backup so things wouldn't go dark. The UPS these are plugged into can keep these lights running for over 24 hrs. The UPS that the main lights are plugged into lasts only about 15-20 minutes so I had to come up with something that would last longer. Perhaps this helped to cut the time on the flowering?