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That Guy
Registered: 08/12/08
Posts: 4,038
Loc: Southwestern US 
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 Can a Seedling get too much light? 
#223803 - 05/07/09 11:05 AM (15 years, 7 months ago) |
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Hi all, I recently acquired a 90W LED grow light...and a homebox S growtent... I have a seedling that is about a week old...just barely has its seedling leaves unfolding.
So i put this little seedling in my growtent and put it about 12 inches away from the light...and it looked good last night...
While i was asleep there was about a 5 hour dark period...and then the light turned on again. When i got up this morning the seedling was drooping badly. I took it out of the growtent...sprinkled a little water over the soil and left it under a low wattage Florescent light. Since then it has perked up somewhat. I haven't seen much on here about seedlings getting too much light...and im wondering if the seedling is just not ready for that kind of bright light yet...or is it something else that is causing this droopiness?
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“The Universe is under no obligation to make sense to you” -NDT
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 Audz
Registered: 03/19/09
Posts: 184
Last seen: 14 years, 7 months
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Re: Can a Seedling get too much light? [Re: Data]
#223823 - 05/07/09 11:46 AM (15 years, 7 months ago) |
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A little bit of drooping is natural at the end of a dark cycle, they should start to climb back towards the light once it comes back on. But I can't imagine 90w of LED light would be enough to light-shock a seedling.
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Data
That Guy
Registered: 08/12/08
Posts: 4,038
Loc: Southwestern US
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Re: Can a Seedling get too much light? [Re: Audz]
#223837 - 05/07/09 12:13 PM (15 years, 7 months ago) |
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cool man thanks 
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“The Universe is under no obligation to make sense to you” -NDT
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Triptonic
Registered: 06/13/08
Posts: 15,581
Loc:
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Re: Can a Seedling get too much light? [Re: Data]
#224110 - 05/07/09 10:55 PM (15 years, 7 months ago) |
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Im thinking there is no such thing as "to much light" there is such a thing as to much heat....but I have never heard of the term "light shocking" before. Pictures would really help so I can see how droopy it actually is. Also what type of soil are you using and stuff like that will help out too. You could be over watering if its drooping.
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dieselkush
Registered: 02/11/09
Posts: 78
Last seen: 15 years, 6 days
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Re: Can a Seedling get too much light? [Re: Data]
#224111 - 05/07/09 10:57 PM (15 years, 7 months ago) |
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interesting, ive ben leaving my 300wcfl and 2 150wcfls on for my two seedling I have going. so far the light doesnt seem to bother them but am unsure when they get a bit bigger. would it be ok to run them on a nonstop light cycle? until they get older I mean. Ive got a timer but its a cheapo, it has 7 days a week on it but every time i set it the timer doesnt shut off when it should and shuts off when u dont want it to. so if I can have the light on 24/7 for a few weeks until I get a new one it would be groovy...
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Triptonic
Registered: 06/13/08
Posts: 15,581
Loc:
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Re: Can a Seedling get too much light? [Re: dieselkush]
#224113 - 05/07/09 11:01 PM (15 years, 7 months ago) |
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Most people run 24/0 in the vegitative state and then 12/12 when in flowering..... again light will not hurt your plants, its over watering and heat that will fuck with your plants. if you click Here you will see my grow where I have my plants on a 24/0 cycle until flowering.
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Triptonic
Registered: 06/13/08
Posts: 15,581
Loc:
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Re: Can a Seedling get too much light? [Re: Triptonic]
#224115 - 05/07/09 11:02 PM (15 years, 7 months ago) |
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plus with those CFL's you can get pretty close to your plant without burning them....just put your hand close to the plant and when you stop feeling heat they are at the right level.
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dieselkush
Registered: 02/11/09
Posts: 78
Last seen: 15 years, 6 days
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Re: Can a Seedling get too much light? [Re: Triptonic]
#224117 - 05/07/09 11:13 PM (15 years, 7 months ago) |
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nice grow, I skimmed through the first page or so. my attention span is shot right now. my light and temps should be ok for now, I had some a while back and had 2 300w, 4 150w, and 2 100wcfls in a cab. I had one hell of a time with temps and killed the pour gals. ive came to the conclusion what I have now(1 300w, 2 150w) should be good until they get bigger, the temps are perfect with just these bulbs. from what your saying the seedlings are far enough away from the lights. my only problem is the soil seems to dry out fast, there in a small container so im having to give the soil a good soak about 3 times maybe 4 times a day on a hot day. is this normal? im afraid they will dry out and die if I dont, but then again im skurred that im over watering them. I did put a layer of vermiculite in the middle of the dish under the top soil to help obsorbe moisture and water..
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Triptonic
Registered: 06/13/08
Posts: 15,581
Loc:
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Re: Can a Seedling get too much light? [Re: dieselkush]
#224119 - 05/07/09 11:19 PM (15 years, 7 months ago) |
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A good way to check to see if the soil needs watering is to put your finger down about an inch and see if its dry...if your finger comes out dry you need to water. Usually you will only have to water once or twice a week. But since your pots are small you might need to water more often.....all I know is that I had my seedlings in a pellet for a while and they didnt even need to be watered every day. And those are pretty small. What are you using?
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dieselkush
Registered: 02/11/09
Posts: 78
Last seen: 15 years, 6 days
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Re: Can a Seedling get too much light? [Re: Triptonic]
#224124 - 05/07/09 11:32 PM (15 years, 7 months ago) |
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lol, you know those loyed's barbacue beef containers. I took one and poked holes in the bottom and set that on top of another one. so its about 3-4"? deep and 5-6"? wide. i might be wrong on the dimensions...
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Triptonic
Registered: 06/13/08
Posts: 15,581
Loc:
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Re: Can a Seedling get too much light? [Re: dieselkush]
#224125 - 05/07/09 11:34 PM (15 years, 7 months ago) |
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Well lol if its dry its dry, although you might want to move it to something bigger....if you dont want to water all the time.
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dieselkush
Registered: 02/11/09
Posts: 78
Last seen: 15 years, 6 days
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Re: Can a Seedling get too much light? [Re: Triptonic]
#224128 - 05/07/09 11:46 PM (15 years, 7 months ago) |
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I think im going to have to,maybe to cut down on watering. course Im out of a job right now so its not like I need to save time with the gals. I think you awsnered my questions with your triptonic wisdom. one last question, Ive seen pics of people covering the top of the pots with tinfoil.leaving a gap for the stem. this is for older plants, but is this to keep in moisture in small heated areas,maybe to to reflect light also? or is this nonesense? thanks a bunch..
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Triptonic
Registered: 06/13/08
Posts: 15,581
Loc:
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Re: Can a Seedling get too much light? [Re: dieselkush]
#224130 - 05/07/09 11:52 PM (15 years, 7 months ago) |
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Haha never seen that one, I know that people "enclose" their plant kinda with tinfoil so that the light gets to all the leaves. But I'm not sure if that actually helps or not. I'm sure if you post something someone will answer that one for you. Good luck to you sir, and feel free to ask more questions anytime.
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dieselkush
Registered: 02/11/09
Posts: 78
Last seen: 15 years, 6 days
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Re: Can a Seedling get too much light? [Re: Triptonic]
#224138 - 05/08/09 12:03 AM (15 years, 7 months ago) |
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neeto, thanks abunch triptonic. Im sure ill be posting more questions along the way. I didnt mean to highjack this guys thread..anyway. enjoy the rest of your night. peace.
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Inverted
CNC Machinist/Greenthumb
Registered: 06/01/08
Posts: 9,953
Loc: North Star
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Re: Can a Seedling get too much light? [Re: dieselkush]
#224291 - 05/08/09 02:08 PM (15 years, 7 months ago) |
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Okay well a seedling can have too much light... If you start a seedling with only 30 W of light. Which is plenty enough to get a couple seedlings going until they are ready for a bigger light source. The problem is when you switch a plant from a low wattage light source to a larger one. (HPS or the Sun). You have to break them in to the more intense light source little by little. If you put it right into the new light, it may not be "hardened" yet and could easily burn.
It's kinda like the geek that sits inside all day and doesnt see much sunlight, they are pale and when exposed to too much sunlight, will burn easily! Try to relate that your seedling. I have one seedling under 30w CFL and its getting big really fast, I put it in the sun for hours a day to get it ready for the full day of sun it will soon receive...
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Don't criticize what you can't understand
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Triptonic
Registered: 06/13/08
Posts: 15,581
Loc:
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Re: Can a Seedling get too much light? [Re: Inverted]
#224292 - 05/08/09 02:12 PM (15 years, 7 months ago) |
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True, but if you start your seedling out with that much light, it will be used to it....thats what the first guy was asking I believe, I dont think hes trying to move it up to a new light. But maybe the dark period has something to do with it. (although I doubt it)
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Inverted
CNC Machinist/Greenthumb
Registered: 06/01/08
Posts: 9,953
Loc: North Star
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Re: Can a Seedling get too much light? [Re: Triptonic]
#224295 - 05/08/09 02:27 PM (15 years, 7 months ago) |
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No you are right, I was just giving an example of where it could be too much light. If you start your seedling under high wattages, it will always be used to that. I'm assuming the drooping is due to overwatering, but cannot be sure until pictures show due justice.
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Don't criticize what you can't understand
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Triptonic
Registered: 06/13/08
Posts: 15,581
Loc:
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Re: Can a Seedling get too much light? [Re: Inverted]
#224296 - 05/08/09 02:28 PM (15 years, 7 months ago) |
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Agreed PICS OR WE CANT HELP lol
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Data
That Guy
Registered: 08/12/08
Posts: 4,038
Loc: Southwestern US
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Re: Can a Seedling get too much light? [Re: Triptonic]
#224430 - 05/08/09 09:20 PM (15 years, 7 months ago) |
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well i am currently away from my seedling...but if its not dead and still drooping then I will post a picture...for right now i believe it may be overwatering...Thanks so much for the advice and info 
agmotes165
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“The Universe is under no obligation to make sense to you” -NDT
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ethnoguy
E to the G
Registered: 04/21/08
Posts: 429
Loc: your momma's house
Last seen: 15 years, 4 months
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Re: Can a Seedling get too much light? [Re: Data]
#224434 - 05/08/09 09:26 PM (15 years, 7 months ago) |
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If its drooping chances are it over watering. High light exposure causes burn. A 90W LED isn't going to do that unless you have it touching the plant basically.
EG
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