How much light is bad light?

the.fatman.cometh

Hey guys, I got another question. I know, I'm sorry
I have to leave the closet door cracked a bit temporarily during the night cycle.
I have to wait another week before I can fix the problem with a real solution.
So, my question is, even though I keep it dark in the room, there is still a soft faint glow that hits the plants sorta, how bad is that?

Cheers

__________________

scott06

this post says anylight will be a problem...but it only adresses the duration of the light not the intensity or luminosity so I am not entirly sure it adresses your question perfectly

Advanced Flowering
Created by Sam Selgnij
Copyright 1986 Ed Rosenthal and Sam Selgnij
In Chapter 25 (Flowering), marijuana's photoperiod response
was described. Most varieties of cannabis flower in response to
changes in the light cycle. This is a foolproof method for a plant to
determine when to flower when it is adapted to a particular loca-
tion. Every year the ratio of dark to light remains the same at a par-
ticular date. Scientists think that plants measure the number of
hours of darkness by producing a hormone, tentatively named
florigen. This hormone has not actually been discovered. The
theory is that when the level of this hormone reaches a critical level,
the plant goes into its reproductive mode.
Through simple experimentation, we know some interesting
things about this plant response. It is a localized response by the
plant. This was discovered by shading one branch of a plant but
leaving the rest of it without a daily dark period. Only the branch
that was shaded flowered. (This is a viable technique to use to sex
plants).
Researchers think that the hormone is produced by the plant
continuously. However, it is destroyed or metabolized by an en-
zyme or hormone which is produced only in the presence of light.
Under natural conditions, the critical level builds up only with the
onset of long nights in the autumn. When the dark cycle is inter-
rupted by light, even for a few minutes or less, the florigen is
destroyed by the plant and the plant starts the buildup to the critical
level over again.
The response to different light cycles is a graduated one. Plants
that initiate flowering at one light/darkness routine flower more
heavily when the amount of darkness is increased. This response is
more pronounced on plants originating from a higher latitude
where the light cycle changes more.
Chrysanthemums are also long night-flowering plants, and
their growth patterns have been studied extensively for use by the
greenhouse industry. Researchers found that the largest flowers
with the highest total weight were grown when the dark cycle
routine was provided each night. When the plants were shaded 6

nights a week, there was a slight diminution of flower size and total
weight. With each additional unshaded night, flower size and
weight dropped.
Cannabis is one of the most widespread plants. It is naturalized
everywhere from the equator to the arctic. (Private cannabis
gardens have also been documented as being grown by scientists
stationed at outposts in the Antarctic - it's not illegal there since
no country has sovereignty). The plant has developed many varia-
tions on the photoperiod response to adjust to different climactic
and latitudinal conditions.
Female plants from equatorial or sub-equatorial zones such as
Colombia, southern Mexico, central Africa, and south India are
absolute photo-determinate (APD). These plants are acclimated to
latitudes in which there is little variation in the light cycle
throughout the year. As long as the dark period falls below a
minimum trigger period, the plant remains in the vegetative growth
cycle. This can go on for years under continuous light conditions.
When the dark period lengthens to a trigger point, the plant
changes its growth pattern to sexual development. If the dark
period falls below the trigger level when the plants are flowering,
the plants easily revert back to vegetative growth.
APD plants are good candidates to flower and regenerate.
Since they respond to the light cycle in a relatively simple way, ir-
regular or interrupted cycles alter growth significantly. Buds are
smaller, leafier, fluffier, looser, and may run. They look a bit like
low-light flowers.
Flower size can be increased by allowing the plants to ripen ful-
ly, then placing them in a continuous light regimen for a few days.
Flowering is triggered again and the plants produce new clusters of
flowers.
Some cannabis varieties are "relative photoperiod deter-
minate" (RPD). These plants have a trigger that they respond to
under normal growing conditions, but when they receive an unusual
light regimen, they respond to the change in the light conditions in
unusual ways. For example, an early flowering indica normally trig-
gers at 10 hours of darkness, but if it is grown under continuous
light and then the darkness cycle is increased to 8 hours, the plant
triggers. Once these plants are triggered, the light cycle has less af-
fect upon them than upon the absolutes. The developing flowers are
not as sensitive to occasional interruption of the darkness cycle.
RPD varieties include mid-and high-range latitude-adapted
plants including Moroccans and southern Africans, early indicas,
commercial hemp and hybrids developed for early harvest
(September or earlier).
RPD varieties are harder to manipulate using the light cycle.
Plants placed into flowering do not revert to vegetative growth as
easily as APD varieties. The plants are harder to regenerate. Light
stress promotes hermaphroditism in these varieties. They are harder
to clone; they take longer and have a lower success rate.
Most males and some extreme northern varieties including the
ruderalis strains fall into a third category which is not photosen-

sitive at all. Both age and development seem to play a role in deter-
mining when these plants flower. For example, a Hungarian
ruderalis developed flowers under continuous light after 8 weeks.
Most varieties of males indicate under continuous light after 3-9
months. Thais and some equatorial sativa males are exceptions and
will not flower until the dark period is increased. Under 18 hours of
light, males indicate sooner than under continuous light.
Cold may hasten sexual expression but not flower development
of some northern varieties.
Some varieties, especially indicas, respond to unnatural light
cycles by showing of photo-period response disorder. Genetic
females turn hermaphroditic when exposed to long dark periods
during early growth.
Chart 27B
MATURATION PATTERNS UNDER NATURAL LIGHT
LENGTH OF FLOWERING
Inductions 3-4 Weeks 5-7 Weeks 8-15 Weeks
Flowering Short Medium Long
Early July 1 2 3


Mid-August-
________ _________ 6
________ 5 _________
4 _________ _________
September

Late October-
__________ _________ 9
_________ 8 _________
7 _________ _________
November
Colombia & Equatorial African 8-9
South African 2
Southern Mexican 5-6
Early Indica 1-2
Late Indica 5
Southern Indian Sativa 8
Thai 9
Ruderalis 1
Nepalese 6
Chilean 1-2
Korean 1-2

jangel

If it is consistent and unchanging, like the stars I think it is okay. I know Pappy says his flower room gets light from his veg area during the dark cycle and he has never had a problem. There are totally the other school's of thought as well. Any light during flower is bad. Are you veging or flowering now?

__________________
Life,
j-angel


My Little Grow LST'ing w/Hardware

My Outdoor Odyssey 2008 BONSAI MUMS

Cloning a Flowering Plant My Little Grow Blueberry

the.fatman.cometh

Scott, thanks for the article bro, I'm gonna have to finish it later though, lol.
Jangel, I am vegging right now, we are coming up on 20 days I believe-or maybe right at it, I'd have to pull up the log.
Hopefully it'll be okay. Also, Jangel(or anyone), the leaves still look the same.
I have lowered the temp to 68-70 in the closet, but they still have the same look. :(
Hopefully I will get this sorted before it's too late.

Cheers

__________________

madmax4twenty

i have the same problem. i must leave my door open at night(just a crack), but it faces my veg room. so i get a little light in my flower also. to this point my flowers are looking really good. two weeks in and i have nice nugs developing and triches are forming. i need to add another vent in my room before i can comfortably leave the door shut. to much neg pressure for me. when i figure out how to resize pics effectively i will load pics. ill be fixing mine this weekend. puff on

__________________
Any above information should be considered fictional or theoretical.
Anything I may say or do is strictly for entertainment purposes only.This is all make believe and is not believed by me or anyone. I do not now, nor ever will grow illegal substances. All posts are fictional.

the.fatman.cometh

Man, it turns out my biggest problem is freakin heat. I still havent got it sorted.

__________________

kailiwela44

wassup man.
i read that if lights were to hit the plants, it could create hermies. IMO, if a plant can be grown outdoors it may have a higher tolerance to dim light instead of total blackout.
i have heat problems also. I did two things to try to aleviate this problem. The first thing was to add CO2 (DIY yeast, sugar, h20). i've read it is only good up to 95F and smells like funky bread. it should be removed during lights off so if it's used during flowering, you may have to make small amounts daily.
The second thing i did which is very iffy was to leave the circulating fan on a 30min on and 30 min off schedule. For my box, it allowed the temp to lower about four degrees during it's off, and when it's on it raises the same amount. I accidently found this when i forgot to turn the timer back on my fan.

good luck,
kailiwela44

__________________
Citral CFL
http://www.greenpassion.org/f22/cfl-...617/#post56555

Top44 supercropped 12/12seedTO10/14
http://www.greenpassion.org/f22/top4...html#post66175

raf33

my grow cabinet is normally covered with lightproof foil for the night time but once I didn't notice a big hole in the foil for the whole time of grow and I know for a fact that plants were getting dim light in the night.but it didn't seem to disturb them too much if at all.I know that light penetration during the night makes plant burn their sugars that should be kept for the day but in the same time it is very rare you have the total darkness during the night outside.I don't know, maybe it results in smaller yield from outside plants? I don't have any clue. but my plants seemed to deal ok with that bit of light in cabinet.
...and the heat ... it's a nightmare...surely putting up CO2 will help but couldn't get there myself using yeasts. simply, yeasts' CO2 emission was too slow and limited in number. I think I'd need some serious hardware here to keep emission constantly on hight to reduce heat effect on plants. used to keep bucket full of ice cubes in front of the office fan.it can help but keeps you busy with ice.cheers.

ileso

hi mate

as an outdoor grower iv noticed that the moon often realllllly lights up ut plants so, to tell the truth, if its just a sort of glow i dont think its a problem, but, on the other hand ive never really grown indoors so im no expert here.
but like i said the moon really glows sometimes, and the plants always flower perfectly

hope i helped a bit
ileso

scott06

Wierd but true...no one that I know of knows why it is so...but indoor plants are MUCH more sesitive to interuptions of the light cycle...it is conjectured by DJ Short (of blueberry and flow fame) that it is perhaps the exposure to stars and moon that make the outdoor plants less sensitive...Like Ileso I don't consider myself an expert but I am sure about this....don't let light leak or interupt indoor plants in flower if at all possible, unless of course you aren't in a rush...