12/12 schedule ruined by 15 minutes, stress?

D

direct

Member
Okay so I came home today to find out that my roommate had added an extra 15 minutes of light time to my analog timer; only because before it was 11 h 45 minutes of light and 12 h 15 minutes of darkness. So, the plants did receive 15 minutes of extra light today. My question is, should I leave this schedule now which is exactly 12/12 OR should I change it back to the previous schedule for tomorrow (11 h 45 minutes of light and 12 h 15 minutes of darkness). Which would be more stressful on the plants? :S
 
D

direct

Member
http://mjgrowers.com/book_what_exper1.htm

CRITICAL LIGHT PERIOD
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The 12-12 formula has been accepted without question by growers all over the world. Probably one of the reasons for this was my discussion of the technique in some of my early books. The 12-12 regimen was selected because my co-author and I reasoned that no matter what critical period a variety might have, given 12 hours of darkness it would flower. However, most marijuana varieties need fewer than 12 hours of darkness to flower.
If marijuana plants grown outdoors required a 12-hour dark period to flower, they would not be induced to start flowering until September 21, the first day of autumn, when day and night are equal length. They would ripen 6-8 weeks later. In real life most modern varieties ripen between early September and late October. Budding was triggered 6-8 weeks earlier. For instance, an eight-week variety that requires 55 days from forcing to maturity, which would normally ripen on October 1st, would start flowering August 1. At that date in San Francisco, sunrise occurs at 5:14 and sunset at 19:18, a total of 14 hours 4 minutes. Dawn and dusk add another 15 minutes of red light. Plants use the absence of this spectrum to measure the dark period. The total lit period came to about 14:20, leaving 9:40 minutes of darkness. The critical period for this plant was 9 hours 40 minutes. If it were given just 10 hours of dark period daily indoors, rather than 12 hours, it would still flower.
Gardeners growing outdoors who discover the critical time needed to induce flowering can use this information to get more efficient use of their indoor garden. Currently, plants grown under a 12/12 cycle spend half their time in the dark. If the plants have a critical flowering time of, for instance, 10 hours of darkness daily, they can be provided 14 rather than 12 hours of light each day so that they receive almost 17% more energy which they use to produce sugars used for more and faster growth.
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So starting OFF with 12/12 isn't necessarily best for flowering?
 
Cascadian

Cascadian

Well-Known Member
I know some growers use 13/11 with success so 12/12 isn't necessary. 15 minutes on one day will barely be noticeable to the plant. I would go ahead and resume your preferred schedule. Great point on real world light/dark flowering times.
 
D

direct

Member
charface said:
you can go with it or just change it back.
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I'm growing barney's LSD, liberty haze and dinafem cheese. hoping those are good enough genetics to not hermie from something this little. i think i'll just leave it alone, don't want to keep tampering with the timer and it is 12/12 now so shouldn't make too much of a difference (hopefully) -- you seem to have been here long enough for me to trust you :)
 
D

direct

Member
Cascadian said:
I know some growers use 13/11 with success so 12/12 isn't necessary. 15 minutes on one day will barely be noticeable to the plant. I would go ahead and resume your preferred schedule. Great point on real world light/dark flowering times.
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That link has some awesome information about increasing THC content during DARK periods with supplemental lights...

When blue light is turned on during the dark period, plants photosynthesize but their flowering isn’t affected. This results in more growth as the plants produce more sugars. Before LED lights it was difficult to create a pure blue light. Instead, most of the time other spectrums were filtered out, which can be an inconvenient process. Try using between 20 and 40 watts of mixed blue light per 1000 watts of regular light. I have done only initial experimentation with this so test this in a limited way first. I suspect that the additional light is an efficient way of increasing total yieldAside from red and blue light, plants also use orange light for photosynthesis. I haven’t experimented with them yet, but orange LEDs might also help increase yield and probably can be lit continuously, just like the blues. More on this as the news breaks—or at least, as it fractures.
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charface

charface

Well-Known Member
direct said:
I'm growing barney's LSD, liberty haze and dinafem cheese. hoping those are good enough genetics to not hermie from something this little. i think i'll just leave it alone, don't want to keep tampering with the timer and it is 12/12 now so shouldn't make too much of a difference (hopefully) -- you seem to have been here long enough for me to trust you :)
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lol. thanks?
good luck with the plants
 
Nutes and Nugs

Nutes and Nugs

Well-Known Member
I would leave it alone.
It's hard as fuck to accurately re-set an analog timer.
Click click click, hmmm, that's the spot.

Maybe just set it back a few more mins on the on or off time.

I've playing with setting my analog timer back 1 hour on the off time each week after going 12-12.

Not sure if it helps or not at this point.
 
D

direct

Member
lushgreen said:
Just leave it, as said, it won't make any difference. Smack the shit out of your room mate for touching your grow though.
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haha yeah, that part's been taken care of :P I guess I'll leave it, lights going off at 2:10 am and coming on at 2:10 PM exactly now (I checked today)... so should be fine.
 
M

Mikelej14

Member
So Similar situation, kinda, but, different:
My timer is set 9pm-9am to be off, but last night i had forgot to close up the area for light, so it turned off normal time, but may have had some minor light leakage for about an hour until another door got closed...
Do you think that happening will cause any issues?
 
jondamon

jondamon

Well-Known Member
Mikelej14 said:
So Similar situation, kinda, but, different:
My timer is set 9pm-9am to be off, but last night i had forgot to close up the area for light, so it turned off normal time, but may have had some minor light leakage for about an hour until another door got closed...
Do you think that happening will cause any issues?
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Firstly 6 year old thread lol.

secondly once shouldnt harm.

just Try not to do it all the time.
 
M

Mikelej14

Member
Lol wow sorry didnt notice it was so old, strange that it was shown to me at all as if it were recently posted.. but none-the-less, old or not, still applies :) thanks for quick response :p i try not to let it happen, i have my area closed up in back of a deep walk-in closet, but that area i made isnt 100% lightproof, so i also have a heavy blanket hung over the closet area to block light the reflected/indirect bedroom light from going in that closet. Just forgot to flop the blanket back down
 
jondamon

jondamon

Well-Known Member
Mikelej14 said:
Lol wow sorry didnt notice it was so old, strange that it was shown to me at all as if it were recently posted.. but none-the-less, old or not, still applies :) thanks for quick response :p i try not to let it happen, i have my area closed up in back of a deep walk-in closet, but that area i made isnt 100% lightproof, so i also have a heavy blanket hung over the closet area to block light the reflected/indirect bedroom light from going in that closet. Just forgot to flop the blanket back down
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You should be fine.

plenty of people go in their rooms and take pics during dark hours.

just don’t make a habit if it. .:joint:
 
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