Few minutes of light during dark??
- Thread starter Allbr
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Bukvičák
Well-Known Member
You can not be serious...
Star Dog
Well-Known Member
Whats the purpose of that?
magnetik
Well-Known Member
depends. The real question is.. was the light cycle interrupted enough to change the phytochrome state of the plant and hormones to cause issues? If no.. then nothing to worry about and carry on. If yes the fastest way to get them back into sleep mode is to hit them with some 730nm Far Red for a few minutes. I personally don't go into my tents when lights out but don't think it's an issue if someone needs to get into it and flip on/off a switch and get out afterwards. It's really for the times that the timers f'ed up or left lights on long enough for other reasons.
Bukvičák
Well-Known Member
That works great at the end of the light period, I understand what you mean but in the midlle of the dark? I think that would do more harm than help. Anyway, if you interrupt dark let say for only one time accidentaly, its not such a big deal, but problem is when you are doing it systematicaly.
magnetik
Well-Known Member
Its not the dark cycle to the plant if it thinks it's daylight and hormones start changing. If you pulse 730nm (with no other lights) it almost instantly changes phytochrome state back. Instead of taking 2ish hours it's minutes. Which is why you only need a few minutes after lights out.
a page out of Rosenthals book
Pr is sensitive to far-red light with a peak at 730 nm and is affected in a range of about 700-715 nm. In its presence it changes almost immediately to active form, Pfr. This effect is useful for shortening the two-hour time it takes plants to switch from inactive to active form.
Indoors after the grow lamps are turned off, expose the plants to far-red (730 nm light) which turns the Pr to Pfr much faster and induces flowering within a shorter dark period. You can provide far-red lighting using LEDs or some fluorescents. Far-red light can also be used to restore the active form of the hormone if the dark is interrupted by light. This may ameliorate the consequences of darkness interruption.
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