Quote Originally Posted by SnSstealth
thanks nole, i am interested in this how would we go about regulating the process? Its easy enough to get a IR LED light for CCTV systems but I dont know any other variables i.e. how long and when to run them(and if those are the right IR spectrum). How is it we could reduce the nights? it could be a big risk to mess with lighting times on a whole grow so i'd have to have a separate chamber.
Flower with shorter Nights

There are another pair of pigments involved in things here - phytochrome-R and Phytochrome-FR. Phyto-R is most sensitive at 660nm Red, while phyto-FR is most sensitive at about 730nm Far-Red, hence the R and FR naming (IE, JUST 735nm and very near wavelengths, but nothing under 710nm or so). With 735nm far-red/near-infrared emitters available then it's possible to flower cannabis with 15 hours 'daylight'. How? Why? Well, the plant senses that critical 12-hours-darkness that triggers flowering in cannabis because a critical amount of phytochrome-FR has slowly, naturally, reverted to phytochrome-R during the dark cycle. But during the 'day' 660nm red light converts the phyto-R into phyto-FR, while far-red 735nm light more slowly converts the phyto-FR back to phyto-R. So we run all lights for 15 hours, then run nothing but 735nm for another two hours and finally 7 hours darkness.- artificially driving much of the phyto-FR back to phyto-R without waiting 12 hours for the natural reversion- so you can actually flower with shorter nights.

That's 30% more light per day reaching the plant, the result is that we can pump 25%-30% more energy into the plant each day - that means 25%-30% more growth - during the flowering cycle. Pushing even longer is probably possible, with sufficient intensity of 735nm alone during some portion of the 'dark' cycle. Several experiments have already documented this effect.