Changing timing

Hey ...have a quick question...im currently on 12/12...but...i want to change the 12 hours my lights are on...is their a safe way to do this without freaking out my plants???.....thx

I have done it before let me tell you it stressed the hell out of my plants out of 27.... 5 turned hermie and yeild went down and maturation slowed but they did finish just 2 weeks late and with some beans I wouldn't unless I had to just finish up and switch next go round

thanks for the reply...leaving out of town this weekend and really need to get it changed...there has to be a way...maybe like changing 2 hours at a time until i leave or something...?

yea if you do do it gradually. for my veg period i've been fairly sporadic between 18 & 24 hours and they seemed fine. for flower tho i'd be careful, take notmine's advise into consideration

Yeah it sucks, I have 12/12, and I basically wanna switch to the opposite of what I have, due to temps.... but I only have one plant I don't wanna risk making it male or just confusing it and slowing it dramatically.. so I guess I'll just deal.

so when i switch to 12/12 should i should make lights off at night right?, or no?

sb101 said:

so when i switch to 12/12 should i should make lights off at night right?, or no?

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you can make your 12/12 any time you want...but from what im experiencing...make sure you know what schedule you want them on b4 you do it,,,good luck

greenleaf said:

you can make your 12/12 any time you want...but from what im experiencing...make sure you know what schedule you want them on b4 you do it,,,good luck

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haha yea guess i learned that from this thread,

It doesn't matter what time of day you run your lights, except for your convenience.. Some ppl prefer day-time light access, and others prefer to run the lights through the night so the operation is stealthier during day-time..
If I had to alternate scedules instantaneously, I'd opt to increase the daylight hours until switch time, rather than shorten daylight, or mess with the dark cycle..
eg. If you wanted to run lights the exact opposite hours tomorrow, I'd give them light for 24 hrs until your desired dark time.. Or if you want lights on 6 hours later, give them 18 hours of light.. If you want them on 6 hours earlier, thats 30 hrs of light until desired shutdown..
This opinion is mainly the result of alot of convoluted reading.. Personally I've never had to tinker with that, but a friend did, and he had very little problem using that method 3 freakin times..
Obviously though, if you can stagger it you're better off..

by the sounds i have been lucky, i never bothered with timers as i put them out on a sunny day and under lights on a overcast day, they have been on 12/12 for 3 weeks now and twice forgot to wake my babys up, giving them more like 16 hours dark and 8 light, also a couple of times forgetting to put them to bed, but only a hour late tops... point being i am either very lucky or the real problems are from messing up the dark period by light leaks etc.. i can`t see how giving it a hour here or there extra dark time to get to the time you want will hurt your plant .. but hay i am no expert

You miss understand, changing the daylight period is sometimes necessary when uncontrollable circumstances change, and thats what this thread is about.. It has nothing to do with rationalizing stupidity and laziness..
Messing with any portion of the light cycle will stress your plants.. Stressed plants tend to underperform, or herm out.. If there is one dependable thing in nature, its the light cycle.. Plants are very reliant on this..

not sure if your refering to me with (rationalizing stupidity and laziness..) but if so then if you look closely you will see this happened a couple of times and niether were from laziness or stupidity but circumstance and only a fool would presume otherwise or try and read into a comment and make 2+2 = 10...
Photosynthesis can only occur between 32-95 degrees F (0-50 degrees C), and is most effective at room temperature (72 degrees F, 25 degrees C). Photosynthesis does not work at night or during cloudy days, because not enough light hits the plants. you say the one dependable thing in nature is the light cycle, true in part but during that cycle you have bad days with cloud , so after a week or so with heavy cloud does this to stress the plant?

Its not about photosynthesis exactly.. Its about hormone reaction.. Pretty much anything much brighter than a full moon can
affect these balances.. Its almost analogous to recharging older batteries before they are nearly depleted, or not fully charging them before use.. (Its not good for any rechargable new or old actually)..
Plants have had eons to adapt to varying light intensity.. They actually perform more 'efficiently' with varying intensity, ergo light movers and tracks..
BTW, the point where photosynthesis slows to virtually nothing is about 50 lumens/sq.ft human sensitive equivalent in sunlight.. Cloudy days are still much brighter than that.. But to answer your question, yeah marijuana prefers nice bright sunlight..