Im still fucked when it comes to how the fuck they work lol! Can u explain it in simpleton terms spliff??
The Short Day Plant flowering period is actually controlled by the length of the night, for this example, short day plants begins to flower when the day and night reach a 12/12 balance.
Phytochrome: Under normal conditions when at sunset or when lights go dark, the amount of available Far RED light is quite small, it takes two hours for the Phytochrome to switch from it's
Active or
Pfr state to the
Resting or
Pr state (the night length effects Phytochrome which controls hormones to express growth and flowering). With our example, when the night is 12 hours long the Phytochrome is actually in the resting state for 10 hours.
The Flower Initiator, turned on for a few minutes before Sunset (really more like dusk) and left on until fully dark (outdoors and in the greenhouse) or a few minutes before lights out and then for another 5-7 minutes (indoors) the Phytochrome will switch states within mere seconds to a few minutes. This will make the plants "perceive" the night to be two hours longer than it actually is.
Indoors, under lights, when you go to 12/12, with the
Flower-Initiator added, the plants will react as if the night is now 14 hours in length, the plants will respond as if winter is coming on strong and will initiate flowering robustly, once the flowers begin to show true form, about a week, one can lengthen the lit hours, gradually over a weeks time, back to 13.5 to 14 hours, the night to 10 to 10.5 hours in length (the plants will see the night as as being 12 - 12.5 hours long) which will result in better yields and quality, due to the extended lit periods. When you are ready to finish and harden the flowers, gradually decrease the lit period to 12 hours, but the plants will then react as if the night is now 14 in length as if, again, winter is about to come on.
Outdoors and in the Greenhouse once the Flower Initiator is put in action, as described above, when the night reaches 10 hours, the plant perceive that night as being 12 hours long, and they will begin to initiate flowers, you should increase the night length (set the lights to come on a bit earlier) as the days go by, until you reach the point where you prefer the flowering results, stay there until you feel it is time to finish, then increase the night length (
FI light on earlier) to be perceived as 10 hours (your actual local night length should be at 12 hours or less at that point. For example, this will allow the flowering during the longer and stronger daylight of of August and September (In the Norcal outdoor test location), rather than a month or two later dependent upon specie type. You can determine
your local sunset here.
More info can be found
HERE, with links to supporting studies and Ed Rosenthal's remarks at his website. I hope this is OK!