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 vinsue
GRAND OLD FART
 
Registered: 02/07/09
Posts: 470
Loc: The Garden State(NJ) 
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 24hr vs. 18 hr of light... 
#758051 - 11/19/14 10:11 AM (10 years, 1 month ago) |
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Is there any significant advantage/disadvantage of 24 hr/day vs.18 hrs light when starting seeds and throughout the veg period? I'm going to start just a couple seeds using one 100w HPS bulb and a couple 200w equivalent CFLs ( 6500k, 40w, 2800 lumens each ). How about when starting and vegging clones? Any major performance difference between 18 and 24 hr light cycles? Would adding a couple 2700k bulbs ( or bulbs with a different K value ) make any difference?  ... . . . 
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" One toke over the line... "
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Magash
The Feminizer
Registered: 04/21/08
Posts: 6,634
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 Re: 24hr vs. 18 hr of light... [Re: vinsue]
#758052 - 11/19/14 10:32 AM (10 years, 1 month ago) |
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I'm a 18 hr a day man myself but others swear by the 24 hr thing. I myself found no benefits when I tested this theory out. From what I've studies on the plant it needs some shutdown time each day just like we do.
CFL light I can't comment on I don't use them.
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All creatures tremble when faced with violence. All creatures fear death, all love life. If we can only see ourselves in others, then how could we possibly hurt another creature?
 Join us at the Growery!
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 Jack Ching
Bada-bing
Registered: 06/19/13
Posts: 10
Last seen: 10 years, 8 days
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Re: 24hr vs. 18 hr of light... [Re: Magash]
#758055 - 11/19/14 10:38 AM (10 years, 1 month ago) |
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I can only mirror Magash' statement. I started out using 24hr initially, and it works great, no complaints, no issues whatsoever. I switched to 18 and didnt see a difference, figure I might as well be saving a few bucks if there is no difference.
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Formerly: DieselB
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Deadkndys420
Registered: 08/28/12
Posts: 8,703
Loc: █████
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Re: 24hr vs. 18 hr of light... [Re: Jack Ching]
#758065 - 11/19/14 11:26 AM (10 years, 1 month ago) |
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This debate will never end imo. Heres a copy paste of some responses I got on MP when I asked this question.
Quote:
MJ is one of those magical plants, while in its veg stage it technially doesnt need a dark period, all a dark period does is cause the plant to stretch between nodes, the plant can continue to grow and grow and grow without ever seeing a dark period for years, i have a friend who has a mother plant thats going on its 9th year alive and every clone grown and flowered is still as good as it was 9 years ago.
Quote:
That is one of the common misconceptions about cannabis. Some plants need a dark period and some plants don't. Like Sunakard mentioned, cannabis is one that doesn't need a dark period--there is no benefit to a dark period when in veg. Running 18/6 encourages the plant to stretch (looking for light) during the dark period, 24/7 light and the plant will grow--develop new internodes rather than stretch.
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Magash
The Feminizer
Registered: 04/21/08
Posts: 6,634
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Re: 24hr vs. 18 hr of light... [Re: Deadkndys420]
#758067 - 11/19/14 11:45 AM (10 years, 1 month ago) |
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I have no idea why he talks about how long his mothers have been around. I've been doing 18/6 since I tested against the 24hr thing didn't find the stretching thing to be true. I've had mother plants since 1991 with 18/6 but that has nothing to do with it. Who know it may change from strain to strain depending on where on earth it came from. I just haven't found that to be the case but I won't say that it's not 
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All creatures tremble when faced with violence. All creatures fear death, all love life. If we can only see ourselves in others, then how could we possibly hurt another creature?
Join us at the Growery!
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Jack Ching
Bada-bing
Registered: 06/19/13
Posts: 10
Last seen: 10 years, 8 days
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Re: 24hr vs. 18 hr of light... [Re: Magash]
#758073 - 11/19/14 12:18 PM (10 years, 1 month ago) |
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Formerly: DieselB
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vinsue
GRAND OLD FART
Registered: 02/07/09
Posts: 470
Loc: The Garden State(NJ)
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 Re: 24hr vs. 18 hr of light... [Re: Magash]
#758077 - 11/19/14 01:02 PM (10 years, 1 month ago) |
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Quote:
Magash said:
... I've had mother plants since 1991 with 18/6...
... I am confused. Are you saying you have mother plants over 20 years old, or been doing this since 1991? Anyway, thanks for the answers, I think I'm going to let my babies rest 6 hrs a day. I think I'll also read some of the 'related threads' below. ( I figured this question was asked before. ) And yea, I'm using these CFLs for now just to get a couple plants going. Any real grow room set up will have to wait a little bit until I can get my finances in better shape, and maybe a little closer to Springtime... . . .
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" One toke over the line... "
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ShameMaker
Registered: 07/13/09
Posts: 36
Loc: Rocky Mountain High State
Last seen: 7 years, 7 months
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Re: 24hr vs. 18 hr of light... [Re: vinsue]
#758122 - 11/19/14 10:23 PM (10 years, 1 month ago) |
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24hr light does not hurt the plants at all during veg. They grow continuously when there is light always present. The only difference I could see is that they would maybe stop growing during the dark period. So theoretically, doing an 18/6 would just slow them down a bit.
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When I feel ashamed I get so scared. It makes me want to hurt you.
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oeric mckenna
Pure Indica
Registered: 07/18/14
Posts: 758
Loc: Mars
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Re: 24hr vs. 18 hr of light... [Re: ShameMaker]
#758130 - 11/19/14 11:45 PM (10 years, 1 month ago) |
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I've been around the horn on this.. at first with 24 I swore I could see that 6hrs of growth in result of light use. If that were true, theoretically the power usage resulting in growth would be equivalent but in a shorter time span. So the savings would be in time spent. Then I realized that the potential to save power was also compounded with this other important fact:
Its good to have shutdown time for your lights. We have hot ballasts and lots of juice flowing...
Rests are good for anything mechanical or electrical and I stand by that statement.
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Deadkndys420
Registered: 08/28/12
Posts: 8,703
Loc: █████
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Re: 24hr vs. 18 hr of light... [Re: oeric mckenna] 1
#758133 - 11/20/14 01:34 AM (10 years, 1 month ago) |
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Quote:
oeric mckenna said:
Its good to have shutdown time for your lights.
I've always read keeping them on 24/7 is best for the bulb as turning it on and off and having it warm up apparently wears it faster.
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vinsue
GRAND OLD FART
Registered: 02/07/09
Posts: 470
Loc: The Garden State(NJ)
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 Re: 24hr vs. 18 hr of light... [Re: Deadkndys420]
#758134 - 11/20/14 01:56 AM (10 years, 1 month ago) |
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Giving the equipment a daily break makes sense, as does the idea of added wear and tear doing a daily start up. I think I read some where that power use spikes significantly on warm up and that it would be cheaper to just run 24/7. I'm not really concerned about the  . Where's a good Electrical Engineer when ya need one ??  ... . . .
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" One toke over the line... "
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13buds
Trichome Farmer
Registered: 08/19/10
Posts: 735
Loc: IN ETHERS TORSION FIELD
Last seen: 2 years, 10 months
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Re: 24hr vs. 18 hr of light... [Re: vinsue]
#758141 - 11/20/14 05:14 AM (10 years, 1 month ago) |
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when I had my veg area running 24/7 growth was great but if I had a power outage or any interruptions in the cycle the plants wanted to flower due to a change in light cycle.. 
I run 18/6 now just for that reason so every lil thing doesnt trigger my plants b4 I want them to. 
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A M U
13B UDS
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GoonerHeClips
Stranger
Registered: 08/24/14
Posts: 380
Last seen: 7 years, 4 months
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Re: 24hr vs. 18 hr of light... [Re: 13buds]
#758148 - 11/20/14 07:06 AM (10 years, 1 month ago) |
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The notion that giving a plant continuous light will produce more vegetation is about the same thinking that giving higher fertilizer dosage will also help. I don't think so. 18/6 is still a lot of hours of light. The plant needs down time, it's called "night".
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Magash
The Feminizer
Registered: 04/21/08
Posts: 6,634
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Re: 24hr vs. 18 hr of light... [Re: GoonerHeClips]
#758149 - 11/20/14 07:34 AM (10 years, 1 month ago) |
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There doesn't seem to be much proof that 24 hr light is in anyway beneficial or bad to be honest. Until it's proven my lights are 18/6. The other reason I use 18/6 is that most plants have a two-phase cycle: an anaerobic one (i.e. “breathing” CO2) during the day, and an aerobic one (“breathing” O2) at night. I figure there has to be a reason for it.
Either way just grow your plants.
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All creatures tremble when faced with violence. All creatures fear death, all love life. If we can only see ourselves in others, then how could we possibly hurt another creature?
Join us at the Growery!
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13buds
Trichome Farmer
Registered: 08/19/10
Posts: 735
Loc: IN ETHERS TORSION FIELD
Last seen: 2 years, 10 months
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Re: 24hr vs. 18 hr of light... [Re: Magash]
#758176 - 11/20/14 11:26 AM (10 years, 1 month ago) |
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everything needs a circadian rhythm 
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A M U
13BUDS
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oeric mckenna
Pure Indica
Registered: 07/18/14
Posts: 758
Loc: Mars
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Re: 24hr vs. 18 hr of light... [Re: 13buds]
#758193 - 11/20/14 04:46 PM (10 years, 1 month ago) |
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Quote:
13buds said:
when I had my veg area running 24/7 growth was great but if I had a power outage or any interruptions in the cycle the plants wanted to flower due to a change in light cycle..
I run 18/6 now just for that reason so every lil thing doesnt trigger my plants b4 I want them to.
Damn. This, from what I've seen, is totally valid. That alone is enough to consider.
Its kind of a big deal actually...
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bEelzeBosS
Are my eyes red?
Registered: 11/15/13
Posts: 706
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Re: 24hr vs. 18 hr of light... [Re: oeric mckenna]
#759738 - 11/29/14 11:22 AM (10 years, 27 days ago) |
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I have a question and dont want to start a new thread, hope OP doesn't mind me asking here...
Ive only been growing for a couple years now and have always done 18/6 but I starting some new seedlings in another room and have had them under 24 hour light for a week now. When they get big enough to transplant I was planning on moving them to my normal veg area, will it stress them much to switch them to 18/6 or do I need to keep them under 24 hour light since they've been this way since they were planted?
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budgrowerwannabe
Bum fighter
Registered: 01/28/12
Posts: 3,360
Last seen: 3 years, 21 days
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Re: 24hr vs. 18 hr of light... [Re: bEelzeBosS]
#759739 - 11/29/14 11:36 AM (10 years, 27 days ago) |
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They will be ok keep them close as possible so they dont stretch when the lights off my 2 cents
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Hawksresurrection
Registered: 12/04/08
Posts: 13,464
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They stop photosynthesizing during the dark period, so that's not when they would be stretching. Sure you want them as close as possible, but the logic behind what you are saying is off.
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Dude she isn't as young as she use to be.
-niteowl
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budgrowerwannabe
Bum fighter
Registered: 01/28/12
Posts: 3,360
Last seen: 3 years, 21 days
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ooooo thought that they would stretch some. I keep mine close so the bush out.
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bEelzeBosS
Are my eyes red?
Registered: 11/15/13
Posts: 706
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Hawk would you agree that switching them to 18/6 after they were started under 24 wont be too stressful?
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vinsue
GRAND OLD FART
Registered: 02/07/09
Posts: 470
Loc: The Garden State(NJ)
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 Re: 24hr vs. 18 hr of light... [Re: bEelzeBosS]
#759764 - 11/29/14 02:33 PM (10 years, 27 days ago) |
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I've decided to go18/6 .
I've got 2 timers, 1 for the fan only.
I'm growing 1auto, so 10 weeks to finish at 18hr.
The other 4 seedlings, too. keep it simple
, though when I hang out with them while they're growing up ,
I might  a few extra hours and/or watts/lumens
On them.
I've got 2 different mints, a Basil and a catnip in the same room that I brought in from outside.
Usually they die down in the winter, but
I'm going to veg them inside this year. Kind of a natural air freshener.
 . .
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" One toke over the line... "
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13buds
Trichome Farmer
Registered: 08/19/10
Posts: 735
Loc: IN ETHERS TORSION FIELD
Last seen: 2 years, 10 months
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Re: 24hr vs. 18 hr of light... [Re: vinsue]
#759766 - 11/29/14 03:04 PM (10 years, 27 days ago) |
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I have a big tub full of catnip growing in my room also 
I use it to distract my cats away from my good stuff 
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A M U
13BUDS
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Hawksresurrection
Registered: 12/04/08
Posts: 13,464
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Re: 24hr vs. 18 hr of light... [Re: bEelzeBosS]
#759768 - 11/29/14 03:25 PM (10 years, 27 days ago) |
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Quote:
bEelzeBosS said:
Hawk would you agree that switching them to 18/6 after they were started under 24 wont be too stressful?
Wont stress em at all man. I use a 18/6 now as well. While marijuana doesn't "need" a dark period during their veg time, there are processes the plant goes through when the lights are off. It also saves that much electricity.
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Dude she isn't as young as she use to be.
-niteowl
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bEelzeBosS
Are my eyes red?
Registered: 11/15/13
Posts: 706
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Quote:
Hawksresurrection said:
Quote:
bEelzeBosS said:
Hawk would you agree that switching them to 18/6 after they were started under 24 wont be too stressful?
Wont stress em at all man. I use a 18/6 now as well. While marijuana doesn't "need" a dark period during their veg time, there are processes the plant goes through when the lights are off. It also saves that much electricity.
Yeah I normally always veg 18/6...I was just worried that switching them to 18/6 after they started out under 24 for the first few weeks of their lives might stress them into herming or something.
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Hawksresurrection
Registered: 12/04/08
Posts: 13,464
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Re: 24hr vs. 18 hr of light... [Re: bEelzeBosS]
#759815 - 11/29/14 09:42 PM (10 years, 27 days ago) |
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Not during veg 
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Dude she isn't as young as she use to be.
-niteowl
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GoonerHeClips
Stranger
Registered: 08/24/14
Posts: 380
Last seen: 7 years, 4 months
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Would anyone recommend 24 hours of light for clones made during 4th week of flowering to get them to revert to veg faster/more completely than 18 hrs of light?
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Hawksresurrection
Registered: 12/04/08
Posts: 13,464
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Re: 24hr vs. 18 hr of light... [Re: GoonerHeClips]
#759858 - 11/30/14 08:16 AM (10 years, 26 days ago) |
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My clones always 24 hours
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Dude she isn't as young as she use to be.
-niteowl
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