can you alter the dark and light hours?

I have a perpetual grow going but my veg room has out paced my one to three plants into flower a week pace. I also just want to finish out this strain. So I am going to flip my veg room to flower to so both rooms are on same time on and off so I dont have to mess with light leaks from one room to the other either. My flower room is light tight but my veg isnt.

Now onto my question. Can I alter what hours are the dark hours in my flower room? I.E. I'm on a 9am to 9 pm lights on cycle but would like to flip it so its lights on 8 pm to 8 am. will that hurt the plants already flowering?

I have has to do this a few times I haven't had any problems. I try and give them an extra hour of dark if I do

hey bro, didnt really understand the beginning part of ur post? if ur flower room is tight it shouldnt matter the other ones leaks provided a dark room? but with your question i read on another forum that u gotta leave her in the dark for 24hours before u make the change, in ur case 37, if ur early on in flower it will probably just mess with her hormones a bit but after a few days should be fine, at the end of the day she is a weed and if everything else is spot on, should work out
hopefully someone will follow up with the science behind it, good luck

I'm really new at this but have been reading non stop since long before I started. So perhaps someone can give me some back up or a safer method. Ive had to do similar and what I did was alter the on off time equally by a half hour till I was in sink. I do it that way mainly because it seems extra safe from what know. I'd try an hour a day even just to get it over with sooner. really your giving them the same light on time. just sneaking out some sleepy time. I'd be interested on some more opinions my self on how much this really maters. I don't know how hard it is to make them hermaphrodites. Ive read both that its easy and hard. I'm thinking genetic background has a fair bit to do with it.

No issue with what you want to do. I recommend leaving lights off for 24 hours, as opposed to leaving lights on for 24 hours. Doing this once in a while will not hurt your photo period as far as the plants are concerned. It takes more than 1 day for plants to realize that you flowered them.

i thought that bout one day for the plants to notice, but seems the hormones start to change as soon plant is exposed to set time of 'night' so if u flip 12/12 ur plant will notice in that 24 hours, takes bout a 5/7 days for visual, changing the time of 12/12 when already on 12/12 by having anothe 12 hours light will make it think its going back to veg thus stressing it, wont really make a massive affect on growth/yield but less stress is best:jointsmile: if u need to change the times.. do it the dark :)

Simple rule here.

If the plants are in, or going in, flower, -long night.
If they are vegging and will continue to veg, -long day.

To understand why, look up photo-period.

Aloha,
Weezard

Fantastic. Now that makes perfect sense. So for flower don't exceed 12 hrs light and do what you need to do to change the scheduled by altering the dark time.(preferable longer not shorter right) And as for veg its the opposite. Is this correct?

Um, no.
Not to put too fine a point on, it but exceeding 12 hours of light is not the problem.

Photoperiod is controlled by hours of dark, period. :)
Best to think of it that way.

Again, look it up in the archives here.
(First link in my signature)

Arm yourself with knowledge.
Grow quality medicine that is saving lives.

If you should happen to enjoy the meds?
Goodonya! :D
Aloha,
Weezard

So what is your point? I advised to keep lights off in order to change time off day.

And; If you want to change over your lights on/off schedule you err on the side of darkness; As I said.

thanks for the replys!!

As to the first part of my post. I have a side by side veg and flower. My flower room has a flap I open during light hours to help let in fresh air and lower the humidity. When I put both into flower I wont have to keep up with opening and closing that flap. I needed no flap for the veg room since when its dark for the few hours it is I have it in sinc with the flower darkness.

The 24 hours dark before the switch makes the most sence so I'll go with that one.

I'll add some photos once my flower comes on. Once I finish this all out I will be better informed with how to clone. I think I got too happy with cloning and made far too many clones all at once. I just went for broke cause i went from a small closet to my wife letting me take over a whole room in the basement!! After the first 3 months she was like "if I had known you could have done this much, this well, this fast I would have let ya do it years ago!! I'll be on my 4th year in 2013 with my MMJ card woot!!

Thanks again for the replys!!

just read that if you leave your plant in total darkness for 36 hours before the switch that it can significantly induces flowering in the plant, quicker bud development from the start, maybe an extra weeks growth in your flowering time:thumbsup: i think this i will try. good luck

Quote:

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Originally Posted by higher_than_you

just read that if you leave your plant in total darkness for 36 hours before the switch that it can significantly induces flowering in the plant, quicker bud development from the start, maybe an extra weeks growth in your flowering time:thumbsup: i think this i will try. good luck

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Some may claim this but all our really doing is taking away photosynthesis and Growth from the plant, as well as stressing plan out

yeah i hear ya bro, could be worth the stress tho if the nugs form a week earlier? says its massivly boost the hormone change, and considering he is gonna be changing the times anyway thought it could be worth trying thats all. i still gonna give it a try, maybe will post some results seems like a good topic of conversation :D

Howzit HTY?

This sounds like an experiment that is worth doing right.:thumbsup:

Allow me a suggestion.
If you can do so, please do a side by side test.
Couple gals with a 36 hour launch, couple with straight 12:12.
Start a thread for it, taking pictures before and after

Science and logic say that an 11:13 light to dark ratio is all you need do to hasten flower set.
After 12 hours of darkness the hormones that control the inhibition of flowering are almost fully depleted.
So, logic says that adding a "safety hour" of darkness might speed the appearance of pistils.
Once they are in flower, changing back to 12:12, or even 13:11 will provide more light energy during the flower stage.

But if you don't try this 36 hour experiment you'll add another unresolved wondering to this mess in my mind.

(Keep in mind the "dark time" trigger threshold will vary with the strain.)

Aloha,
Weezard

hey weezard!

good over here dude :thumbsup:

i hear ya on the unresolved issue lol, experiments and different methods of training and growing intrigue me greatly, some might say a secret geek, i read a lot of reports ect but doing it yourself i find just gives you that extra piece of mind when u actually experience the results.

i will be trying this, but on the next crop, unfortunately i am already a week today into flower atm with my girls already.

yes to all on your suggestion tho, if ur gonna do it, do it properly. i have another 7 weeks minimal in flower and wont be putting any into veg for a few weeks, maybe if anybody is reading this and interested and due to flower soon could start it sooner and others and i could add there results too it, ill keep a look out and if nothing then i will step up closer the time

and :thumbsup: weezard, i didnt know about the different 'dark time' trigger threshold with varying strains, when i try this i will make sure there all the same strain and from the same seed company.

now i guess i need to find a strain thats blows me away enough that i dont mind growing 4 of them :jointsmile: