Home | Community | Message Board



Please support our sponsors.


Welcome to the Growery Message Board! You are experiencing a small sample of what the site has to offer. Please login or register to post messages and view our exclusive members-only content. You'll gain access to additional forums, file attachments, board customizations, encrypted private messages, and much more!

Shop: Original Sensible Seeds Autoflowering Cannabis Seeds   MagicBag.co All-In-One Bags That Don't Suck   Kraken Kratom Kratom Capsules for Sale   PhytoExtractum Buy Bali Kratom Powder   Mushroom-Hut Substrate Mix   OlympusMyco.com No Unicorns Here—Just Quality Bags That Work   Bridgetown Botanicals Bridgetown Botanicals

Jump to first unread post Pages: 1 | 2  [ show all ]
Some of these posts are very old and might contain outdated information. You may wish to search for newer posts instead.
Invisibleniteowl
GrandPaw
Male User Gallery
Registered: 04/20/08
Posts: 4,781
Lighting question.
    #1721 - 04/20/08 03:11 PM (16 years, 7 months ago)

I have 2 small plants (about 2 weeks old) growing in a closet with 4, 40 watt florescent bulbs.

What is a good lighting schedule for them in this early stage of growth?


--------------------
The Ego is a pathological condition
like a calcareous tumor or cyst
that begins growing in the personality
in the absence of hallucinogenic substances
-Terence McKenna-

Extras: Filter Print Post Top
OfflineSirius
Saturn Ascends


Registered: 04/20/08
Posts: 1,540
Loc: The Milky Way
Last seen: 8 years, 7 months
Trusted Cultivator
Re: Lighting question. [Re: niteowl]
    #1770 - 04/20/08 03:26 PM (16 years, 7 months ago)

My friend hasn't grown indoors yet, but from what has been read, keep it on 24/7 for the vegetative growth.


--------------------

Extras: Filter Print Post Top
Invisibleniteowl
GrandPaw
Male User Gallery

Registered: 04/20/08
Posts: 4,781
Re: Lighting question. [Re: Sirius]
    #1774 - 04/20/08 03:29 PM (16 years, 7 months ago)

I was told that the plants do a lot of their growing during the dark hours.

I was thinking about 14-18 hours of light per day and 6-8 hours of dark per day.

Or is it better to just let them have it for 24/7


--------------------
The Ego is a pathological condition
like a calcareous tumor or cyst
that begins growing in the personality
in the absence of hallucinogenic substances
-Terence McKenna-

Extras: Filter Print Post Top
InvisibleScript
Male

Folding@home Statistics
Registered: 04/20/08
Posts: 120
Re: Lighting question. [Re: niteowl]
    #1781 - 04/20/08 03:32 PM (16 years, 7 months ago)

18hrs a day for vegetative growth.

Extras: Filter Print Post Top
OfflineD4NK
Omni-Potent


Registered: 04/20/08
Posts: 18
Last seen: 16 years, 2 months
Re: Lighting question. [Re: Script]
    #1928 - 04/20/08 04:12 PM (16 years, 7 months ago)

I've heard both 18/6 and 24/0 light schedules for vegetative. Does anyone have firsthand experience with both?


--------------------
Moderation is key

"There is no god higher than truth."





HyperConscious

Extras: Filter Print Post Top
InvisibleToiletduk
Head Goon


Registered: 04/20/08
Posts: 1,675
Loc: Earthfarm 1
Re: Lighting question. [Re: D4NK]
    #2703 - 04/20/08 06:04 PM (16 years, 7 months ago)

Yes, 24 hour lights won't do them good. They need a period of darkness for health.


--------------------

Extras: Filter Print Post Top
Invisibleniteowl
GrandPaw
Male User Gallery

Registered: 04/20/08
Posts: 4,781
Re: Lighting question. [Re: Toiletduk]
    #2771 - 04/20/08 06:20 PM (16 years, 7 months ago)

Thats what I thought.

Is 18 hours of light too much now?


--------------------
The Ego is a pathological condition
like a calcareous tumor or cyst
that begins growing in the personality
in the absence of hallucinogenic substances
-Terence McKenna-

Extras: Filter Print Post Top
InvisibleToiletduk
Head Goon


Registered: 04/20/08
Posts: 1,675
Loc: Earthfarm 1
Re: Lighting question. [Re: niteowl]
    #3170 - 04/20/08 07:53 PM (16 years, 7 months ago)

Yes, mine really grew on an 18/6 schedule. My cat kept picking at them, though.


--------------------

Extras: Filter Print Post Top
Offlineecto
prop215 / sb420 patient

Registered: 04/20/08
Posts: 18
Loc: california, usa
Last seen: 16 years, 6 months
Re: Lighting question. [Re: Toiletduk]
    #3893 - 04/20/08 10:26 PM (16 years, 7 months ago)

18/6 or 24/0
people will argue one over the other into the ground. just use either. just to defend 24/0 i've used it with great results.

Extras: Filter Print Post Top
Invisibleniteowl
GrandPaw
Male User Gallery

Registered: 04/20/08
Posts: 4,781
Re: Lighting question. [Re: ecto]
    #4550 - 04/21/08 05:42 AM (16 years, 7 months ago)

Would less than 18 hours be bad for them, say 12-14 hours per day.

Or do I need to stick to 18 hours.

Isn't 12 on and 12 off used for the fruiting stage of growth?

Looks like I may need to buy a light timer.


--------------------
The Ego is a pathological condition
like a calcareous tumor or cyst
that begins growing in the personality
in the absence of hallucinogenic substances
-Terence McKenna-

Extras: Filter Print Post Top
Offlineerb
 User Gallery

Registered: 04/20/08
Posts: 198
Last seen: 13 years, 9 months
Re: Lighting question. [Re: niteowl]
    #4580 - 04/21/08 06:41 AM (16 years, 7 months ago)

24 hours in veg stage for max growth.
marijuana doesn't need a dark period to rest.

switch to 12/12 when ready to flower

Extras: Filter Print Post Top
OfflineSirius
Saturn Ascends


Registered: 04/20/08
Posts: 1,540
Loc: The Milky Way
Last seen: 8 years, 7 months
Trusted Cultivator
Re: Lighting question. [Re: erb]
    #4640 - 04/21/08 07:19 AM (16 years, 7 months ago)

Quote:

erb said:
24 hours in veg stage for max growth.
marijuana doesn't need a dark period to rest.




This is what I had been reading. It said as much in the comprehensive guide on the main site too.


--------------------

Extras: Filter Print Post Top
Offlineerb
 User Gallery

Registered: 04/20/08
Posts: 198
Last seen: 13 years, 9 months
Re: Lighting question. [Re: Sirius]
    #4746 - 04/21/08 08:42 AM (16 years, 7 months ago)

Most green plants are classified as either C3 or C4 which represents how carbon(C) is used during photosynthesis.

C4 plants temporarily store carbon dioxide(CO2) over the dark period to use for photosynthesis during the day. C4 plants slow down photosynthesis once the stored CO2 is used up and they need to gather it from the air. Which is why trees slow down photosynthesis in the afternoon even though the sun is still bright. This does NOT apply to cannabis.

C3 plants(cannabis/veggies) gather CO2 only during the light period when they are photosynthesizing. During the dark period these plants only use oxygen for their metabolic life processes. They don't uptake CO2 , nor do they use it. As soon and as long as the light is on, C3 plants gather and use CO2 for photosynthesis.

C3 plants also have the ability to use higher concentrations of CO2 than what is found in the air. If the light is bright enough and the plants have sufficient nutes, their growth rate will accelerate from it(2000ppm vs. 400ppm of CO2), which increases yield. They can do this continuously, without a dark period throughout the vegetative stage.

The dark reaction is a process of photosynthesis that takes place in both darkness and light. It uses ATP and NADPH molecules that hold energy absorbed from light to break apart CO2 into it's base components.

Again people get anthropomorphic with their plant needs. People need rest, so plants must too. This is false as well. Light means growth. Scientifically. Although 18/6 will shock your plants less when you switch to 12/12, it's a personal choice whether you would rather sacrifice a little growth for a quicker adjustment or less photo confusion. If you want to save money or energy that's a personal choice too. Do what you need to do to make your growing scenario work.

Another factor to consider, your bulb life will be shorter the more you turn it on and off.

Don't confuse internode stretching in the dark cycle with plant growth.
Under 18/6 you may get a taller plant, but the end weight is less than a plant grown under 24 hours of light.
At 18/6 you will save some money on electricity,
but like i said before, 24 hour light means 24 hour growth
as long as the plants other needs are met.

24/0 will always show faster growth
as long as you are providing for the plants other needs.
Marijuana does not need rest.
It does not get tired from to many hours of light.
its keeps on photosynthesizing at the same rate through the entire light cycle.

Although more hours of light does mean higher temp. issues.
I think some people have better luck with 18 hours because of the drop in temps it provides the plants, especially to the root-zone.

Water, CO2 and nutrient requirements are increased under 24/0 .

The daily voltage spike at startup contributes a large portion of the wear on a lighting system.

One week before flowering you can reduce the photo-period to 18/6 to reduce the stress on the plants.
Normally, under ideal conditions you can flower plant about a week earlier when grown under 24/0.

any questions?

Extras: Filter Print Post Top
Offlineerb
 User Gallery

Registered: 04/20/08
Posts: 198
Last seen: 13 years, 9 months
Re: Lighting question. *DELETED* [Re: Sirius]
    #4748 - 04/21/08 08:44 AM (16 years, 7 months ago)

Post deleted by erb

Reason for deletion: double


Extras: Filter Print Post Top
Invisibleniteowl
GrandPaw
Male User Gallery

Registered: 04/20/08
Posts: 4,781
Re: Lighting question. [Re: erb]
    #4763 - 04/21/08 09:01 AM (16 years, 7 months ago)

Double post :shake:


--------------------
The Ego is a pathological condition
like a calcareous tumor or cyst
that begins growing in the personality
in the absence of hallucinogenic substances
-Terence McKenna-

Extras: Filter Print Post Top
Offlineerb
 User Gallery

Registered: 04/20/08
Posts: 198
Last seen: 13 years, 9 months
Re: Lighting question. [Re: niteowl]
    #4774 - 04/21/08 09:17 AM (16 years, 7 months ago)


If you had comprehended my post you might have actually appreciated it.
:jointsmile:  :jointsmile:

Edited by erb (04/21/08 09:38 AM)

Extras: Filter Print Post Top
Invisibleniteowl
GrandPaw
Male User Gallery

Registered: 04/20/08
Posts: 4,781
Re: Lighting question. [Re: erb]
    #4790 - 04/21/08 09:43 AM (16 years, 7 months ago)

I did find your post to be informative, just not the second post :grin:


--------------------
The Ego is a pathological condition
like a calcareous tumor or cyst
that begins growing in the personality
in the absence of hallucinogenic substances
-Terence McKenna-

Extras: Filter Print Post Top
Offlineerb
 User Gallery


Registered: 04/20/08
Posts: 198
Last seen: 13 years, 9 months
Re: Lighting question. [Re: niteowl]
    #4795 - 04/21/08 09:48 AM (16 years, 7 months ago)

whatever

Extras: Filter Print Post Top
Invisibleniteowl
GrandPaw
Male User Gallery

Registered: 04/20/08
Posts: 4,781
Re: Lighting question. [Re: erb]
    #4804 - 04/21/08 10:01 AM (16 years, 7 months ago)

:whatever:


--------------------
The Ego is a pathological condition
like a calcareous tumor or cyst
that begins growing in the personality
in the absence of hallucinogenic substances
-Terence McKenna-

Extras: Filter Print Post Top
Offlineerb
 User Gallery


Registered: 04/20/08
Posts: 198
Last seen: 13 years, 9 months
Re: Lighting question. [Re: niteowl]
    #4807 - 04/21/08 10:03 AM (16 years, 7 months ago)

a better approach would have been just to thank me..
are you the double post police or something? :chillpill:

Extras: Filter Print Post Top
Invisibleniteowl
GrandPaw
Male User Gallery

Registered: 04/20/08
Posts: 4,781
Re: Lighting question. [Re: erb]
    #4818 - 04/21/08 10:14 AM (16 years, 7 months ago)

Um, I believe that I did than you for your post.
Having trouble reading today I see.


--------------------
The Ego is a pathological condition
like a calcareous tumor or cyst
that begins growing in the personality
in the absence of hallucinogenic substances
-Terence McKenna-

Extras: Filter Print Post Top
Offlineerb
 User Gallery


Registered: 04/20/08
Posts: 198
Last seen: 13 years, 9 months
Re: Lighting question. [Re: niteowl]
    #4833 - 04/21/08 10:25 AM (16 years, 7 months ago)

Only after i said i didn't think you appreciated my post.
i hope you stop trying to insult me, there is really no need for it my friend.

Extras: Filter Print Post Top
InvisibleToiletduk
Head Goon


Registered: 04/20/08
Posts: 1,675
Loc: Earthfarm 1
Re: Lighting question. [Re: erb]
    #4902 - 04/21/08 11:23 AM (16 years, 7 months ago)

Very informative. I stand corrected, then. Thanks.


--------------------

Extras: Filter Print Post Top
Offlinearaucaria
Male


Registered: 04/21/08
Posts: 161
Loc: Oregon
Last seen: 15 years, 6 days
Re: Lighting question. [Re: erb]
    #5096 - 04/21/08 01:17 PM (16 years, 7 months ago)

thanks for the info. so the question is: would the veg stage go faster with 24/0? does the extra 6h of light each day add up to a shorter veg. cycle?


--------------------
Kids are always honest
Cause they don't think their ever gonna die

Extras: Filter Print Post Top
Offlineerb
 User Gallery


Registered: 04/20/08
Posts: 198
Last seen: 13 years, 9 months
Re: Lighting question. [Re: araucaria]
    #5120 - 04/21/08 01:25 PM (16 years, 7 months ago)

yes.you can shave about a week of your veg times by going 24/0.

Extras: Filter Print Post Top
Invisibleniteowl
GrandPaw
Male User Gallery

Registered: 04/20/08
Posts: 4,781
Re: Lighting question. [Re: erb]
    #5148 - 04/21/08 01:41 PM (16 years, 7 months ago)

Quote:

erb said:
Only after i said i didn't think you appreciated my post.
i hope you stop trying to insult me, there is really no need for it my friend.




And giving out bad ratings for not bowing down to your wisdom is real grown up :smirk:


--------------------
The Ego is a pathological condition
like a calcareous tumor or cyst
that begins growing in the personality
in the absence of hallucinogenic substances
-Terence McKenna-

Extras: Filter Print Post Top
OfflineSirius
Saturn Ascends


Registered: 04/20/08
Posts: 1,540
Loc: The Milky Way
Last seen: 8 years, 7 months
Trusted Cultivator
Re: Lighting question. [Re: niteowl]
    #5155 - 04/21/08 01:44 PM (16 years, 7 months ago)

You two need to let it go, its distracting from learning about growing. :wink:


--------------------

Extras: Filter Print Post Top
Offlineerb
 User Gallery


Registered: 04/20/08
Posts: 198
Last seen: 13 years, 9 months
Re: Lighting question. [Re: niteowl]
    #5161 - 04/21/08 01:45 PM (16 years, 7 months ago)

:thumbup:
sorry niteowl, i was just trying to help.
i dont want you to bow to me, just meet me halfway..ok?

Extras: Filter Print Post Top
Invisibleniteowl
GrandPaw
Male User Gallery

Registered: 04/20/08
Posts: 4,781
Re: Lighting question. [Re: erb]
    #5176 - 04/21/08 01:56 PM (16 years, 7 months ago)

Thanks again for the info


--------------------
The Ego is a pathological condition
like a calcareous tumor or cyst
that begins growing in the personality
in the absence of hallucinogenic substances
-Terence McKenna-

Extras: Filter Print Post Top
Invisiblecoda


Registered: 04/20/08
Posts: 4,736
Trusted Cultivator
Re: Lighting question. [Re: niteowl]
    #8850 - 04/22/08 05:37 PM (16 years, 7 months ago)

Thanks for chilling out guys, lets keep it civil here :wink:

I'll also agree with erb, it's been proven that going with a 24/0 light cycle is 33% more efficient then going with an 18/6 cycle.  The amount of money you save is negligible, especially if you're running fluros, so you're much better off leaving them under the lights all day and night.

Also, shop light fluro's work well, but CFL and T-5 setups work better.  I just ran a bank of T-5's for a few months because my friend let me borrow them and i'll never go back to my shop lights again (unless i need to).  The T-5's can be a bit pricey but the lumens they put out make up for it and if you know where to look you can get the bulbs at a good price. :smile:

Extras: Filter Print Post Top
Jump to top Pages: 1 | 2  [ show all ]

Shop: Original Sensible Seeds Autoflowering Cannabis Seeds   MagicBag.co All-In-One Bags That Don't Suck   Kraken Kratom Kratom Capsules for Sale   PhytoExtractum Buy Bali Kratom Powder   Mushroom-Hut Substrate Mix   OlympusMyco.com No Unicorns Here—Just Quality Bags That Work   Bridgetown Botanicals Bridgetown Botanicals


Similar ThreadsPosterViewsRepliesLast post
* Grow Light Question cannabispatient 3,329 14 11/21/18 05:20 AM
by funky
* light question plump 1,437 10 01/05/14 01:18 PM
by rikiacypher
* Lighting questions darklight1990 1,590 3 01/14/11 12:33 PM
by darklight1990
* lighting question
( 1 2 3 4 5 all )
double 22,067 85 04/16/12 09:07 PM
by KaptKid
* HID lighting question Baron_Samedi 1,365 8 03/28/16 03:45 PM
by Baron_Samedi
* Lighting question. JeromeBaker 1,785 7 09/12/12 01:35 PM
by Hawksresurrection
* Lighting Questions!!!! GhetDatMoney420 1,820 6 02/26/10 09:51 AM
by pha3r0
* Grow Tent Light Question mystkspiral 3,282 7 11/09/13 06:08 PM
by planterspnut1

Extra information
You cannot start new topics / You cannot reply to topics
HTML is disabled / BBCode is enabled
Moderator: FurrowedBrow, Magash, Data, Dr. Siekadellyk, phychotron
11,561 topic views. 1 members, 435 guests and 713 web crawlers are browsing this forum.
[ Show Images Only | Sort by Score | Print Topic ]
Search this thread:

Please support our sponsors.

Copyright 1997-2024 Mind Media. Some rights reserved.

Generated in 0.029 seconds spending 0.008 seconds on 12 queries.