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Thread: Changing Light Cycles 18/6 - 12/12???

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    Default Changing Light Cycles 18/6 - 12/12???

    Hi,

    I have been vegging my plants for 4½ weeks on 18/6 and now I want to switch them over to 12/12.

    My lights currently come on at 9:00am and go off at 3:00am, so do I need to let the dark period go from 3:00am (lights off) to 15:00pm and then let the lights come on or should I let them come on at 9:00am (as normal) and go until 9:00pm?

    Any help/advice would be much appreciated.


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    I normally give my plants 24hr darkness to give them a bit of a kick start. Dont worry about it too much though just change light cycle to 12/12 when your ready.

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    as ash says it is not as important in veg with a one off but if you are going to change your light schedule , extend the dark period not the lights on period as it is messing with the light on period that can cause stress.
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    Cheers Ash,

    This is my first "normal" grow as I've only grown auto's before, and wasn't sure what would be the best way to do it.

    Hi Wert,

    So, I could just go (lights off) 3:00am (lights on) 15:00pm for 12/12 flowering then?
    Last edited by Steptoe; 20-06-09 at 06:03 PM.

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    i also give them 24 hours of darkness before kicking in the 12/12

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    Hi Skunk,

    If I gave them 24 hours dark that would mean lights on at 3:00am and really I want lights on at 15:00pm, could I then, leave them 36 hours in darkness or would this be too long?

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    Quote Originally Posted by Steptoe View Post
    Cheers Ash,

    This is my first "normal" grow as I've only grown auto's before, and wasn't sure what would be the best way to do it.

    Hi Wert,

    So, I could just go (lights off) 3:00am (lights on) 15:00pm for 12/12 flowering then?
    yes
    ......

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    some growers do give them 36 hours without any concern

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    Hi, First timer here.

    I`ve had my plants in the veg state since germination 6 to 8 weeks ago, I was told a 12/12 cycle! Now I know different...

    Should I just immediately switch to a 16/18 hour cycle? Or do it gradually?

    Any advice would be greatly appreciated

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    Any advice would be greatly appreciated

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