11/13 instead of 12/12 flowering time

kingzt

Well-Known Member
I believe dj short does 11 on and 13 off to show certain genetic traits but is that the main reason? Is there anyone still doing this and is it better to do it for the full flower cycle or just at the end?
 

fskitch

Well-Known Member
Awesome, I read that it might be better for sativas because it could cut down some flowering time
It didn’t cut down on flower time for the two hybrids mentioned above but I’ve heard the same on reduced flower time for sativas as well.
 

StareCase

Well-Known Member
I also read that 11/13 rocks - so I've done both 11/13 grows and 12/12 grows. I didn't find much difference in final product to be honest.

As for enhancing genetic traits of the plants, I found going from a blurple to an HLG brought out much more of the characteristics than the reducing the lights on time.
 

Three Berries

Well-Known Member
What about a gradual reduction in on time as the flowering develops. Something like this? Just hit 4 weeks today. At 12/12 currently.

Flower light 10 week bloom

Weeks 1-2: Set your timer for 11 hours on and 13 hours off.

Weeks 3-4: Set your timer for 10.5 hours on and 13.5 hours off.

Weeks 5-6: Set timers on for 10 hours and off for 14 hours.

Weeks 7-8: 9.5 hours on and 14.5 hours off.

Week 9:-10: 9 hours on and 15 hours off.
 

StareCase

Well-Known Member
... What about a gradual reduction in on time as the flowering develops ...
That will grow you some weed. And would save a little bit on the monthly electric bills.

But I personally found that the best results were with the normal 12/12 flower cycle. Gradually reducing the lights on times didn't produce anything significantly better than what I pull from a regular 12/12 grow.

If you want ... try the graduated grow outlined above then do a 12/12 grow with no graduated lights on times next time. See which one you like the best.
 

curious2garden

Well-Known Mod
Staff member
What about a gradual reduction in on time as the flowering develops. Something like this? Just hit 4 weeks today. At 12/12 currently.

Flower light 10 week bloom

Weeks 1-2: Set your timer for 11 hours on and 13 hours off.

Weeks 3-4: Set your timer for 10.5 hours on and 13.5 hours off.

Weeks 5-6: Set timers on for 10 hours and off for 14 hours.

Weeks 7-8: 9.5 hours on and 14.5 hours off.

Week 9:-10: 9 hours on and 15 hours off.
One of the biggest mistakes I've seen on this forum is light timer fuck ups.
 

Three Berries

Well-Known Member
That will grow you some weed. And would save a little bit on the monthly electric bills.

But I personally found that the best results were with the normal 12/12 flower cycle. Gradually reducing the lights on times didn't produce anything significantly better than what I pull from a regular 12/12 grow.

If you want ... try the graduated grow outlined above then do a 12/12 grow with no graduated lights on times next time. See which one you like the best.
I normally do 12/12 all the way. But don't want to slow the maturity down by limiting light. I'm at 4 weeks today.

OK x 2 4 wk.jpg
 

lakesidegrower

Well-Known Member
I’d try out something different at some point, but if you aren’t seeing differences going from 12/12 to 11/13 then chances are good anything further outside of 12/12 isn’t going to make a difference and the potential to cut into yields starts begging to be looked into.

I tried gradual flip this run - not with the intent of increasing production of yield, but to see how the plant responds to an otherwise stressful/resource demanding time at flip. So far they have prayed through the whole time change.
 

hillbill

Well-Known Member
I have only done this under mostly very efficient wide spectrum white LEDs with some red. 40 to 45 watts sq/ft. Right now at 39 watts sq/ft, mostly Boards from HLG and Elevated Lighting.
 

lakesidegrower

Well-Known Member
Do you think increasing light intensity towards the end is asking for hermis?
I’m thinking that you’re better off tailoring towards natural light levels during the cycle - if anything I’d pull the light levels back before I tried increasing.

Basically you have resin production being tied in ways to stress in the plant; the plant produces flowers and resin in response to a natural trigger caused by changed in its environment (less duration/intensity of light levels, lower temp etc) so in my opinion you would want to exaggerate the natural processes that cause the plant to do what it does in flower, not give them the opposite.
 
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