Careful, you CAN give plants too much light

[Pipe Dream]

For the record there's a difference than too much light and too much heat. Your 250 will not be too much light. I was just reading the FAQs yesterday and it says that sprouts can handle intense light but for clones they like less light when rooting. I think it was right after the previous quote. I used cfls for like 2 days than went right to the 250, I've never seen a plant with too much light. (in person) You would need at least a 1000 watt in my opinion. I hear there are like 2 and 3 thousand watt HIDS and those ones will though. Your problem is something different.

 

[JN811]

I did not come here to argue

I did not mention a 250 watt light

I think I'm in Newbie Central where New growers come to learn?

The OP is trying to tell them there is such a thing as too much light, I posted to support that as I feel it is important to spread the truth about growing to the newbies

47 grams with 97 watts of light off of 1 21 inch tall plant is 1/2 gram a watt dude and that oz and 1/2 will last me 3 months, till the next harvest, it's all the weed I need, may not be a lot to you, but my needs are simple

Your plant yield looks good what was the wieght? plant itself could have done a lot better from what I see in your pics IMO, not a bash

lol you came not to argue, but what are you doing? You obviously didnt read the first post.. because he said his 250 watt was tooooo bright.... which is not true.. Im not bashing u either but you setup looks like its just as expensive if not more for 1/3 the yield... and my bud was AMAZING you can knock it all u want ... especially for a first grow on a budget in college...

 

[JN811]

btw your just as bad as those led users bashing HIDS... you ppl just keep on hating on results..

 

[Shrubs First]

I dont believe too much light is possible. Maybe too close to the plants but at the proper distance from the canopy you cant have too much light. To the OP, try raising it up a foot or so and see how that works.

It's called photo inhibition. photosynthesis will stop when the sunlight on the leafs
surface reaches 6500 Foot candles, the sun puts out nearly 10000 foot candles
almost twice as much as they need for peak photosynthesis, the plants have just
evolved to become the plants we see in nature today, there are things limiting the
amount of light the plants take in, in nature, there is dust, clouds, taller plants,
a whole host of things. You are just speaking of things you know not of.

 

[IAm5toned]

whats really funny about this entire thread, is that its the genetics that determine the plants light requirements....
one guy vegging under a 1000w burns, the next guy does it all day with no issues.... because there growing different strains!

its not rocket science folks. if you have cupping and bleaching, back em off, if not, move em closer, till you have a happy medium.
plants get sunburns too

 

[riddleme]

lol you came not to argue, but what are you doing? You obviously didnt read the first post.. because he said his 250 watt was tooooo bright.... which is not true.. Im not bashing u either but you setup looks like its just as expensive if not more for 1/3 the yield... and my bud was AMAZING you can knock it all u want ... especially for a first grow on a budget in college...

My light set up cost $65

I am not knocking your grow! if that was a first grow, dude you did great !!!!
all I said was it could have been better based on your pics, and I'm sure your 2nd grow will be better, nugs look great!

and I read the whole post, I know the OP was using 250 watts, was not being silly

and if my yield was 1/3 of yours then it was higher, sorry but you would have had to get 200 grams to equal my yield in grams/watts if your using a 400 watter

sounds like an arguement but I'm simply making a point

 

[IAm5toned]

OK I am going to clear up this internet misinformation. You ABSOLUTELY can have too much light. This occured in my plants with a 1000w hps at 8 inches from the plants. I grow with a water cooled fixture so heat is not a factor... Again, too much light is indeed possible. I moved the 1000w to 12 inches and the problem went away.

these pics? not too much light.
the cupping is from too much air movement. the plants moisture is evaporating faster than then it can transpire... so the leave dries out. it happens at the tips first, because thats where the least amount of water is in the leaf... if it was too much light, the cupping would be on the upper leaves.

 

[JN811]

My light set up cost $65

I am not knocking your grow! if that was a first grow, dude you did great !!!!
all I said was it could have been better based on your pics, and I'm sure your 2nd grow will be better, nugs look great!

and I read the whole post, I know the OP was using 250 watts, was not being silly

and if my yield was 1/3 of yours then it was higher, sorry but you would have had to get 200 grams to equal my yield in grams/watts if your using a 400 watter

sounds like an arguement but I'm simply making a point

lol fine.. we'll keep it civil.. lmfao.. but yes I could of done better, I agree.. I think If I cooled my light and had the lumens more contained and did something like SCRoG I would of had better results..My plants were way taller than i anticipated, and I think more light would of helped.. Like I said.. Im sure you can have too many lumens, but most damage takes place from heat.. not lighting.. You may have a different opinion, and I can respect that

 

[riddleme]

lol fine.. we'll keep it civil.. lmfao.. but yes I could of done better, I agree.. I think If I cooled my light and had the lumens more contained and did something like SCRoG I would of had better results..My plants were way taller than i anticipated, and I think more light would of helped.. Like I said.. Im sure you can have too many lumens, but most damage takes place from heat.. not lighting.. You may have a different opinion, and I can respect that

Civil is good,,respect back

I am just here to help the new growers

 

[JN811]

Civil is good,,respect back

I am just here to help the new growers

cool dude, me too.. Im out peace.

 

[llewop211]

In my experiences I've never seen to much light. I use a 1000 watts on my clones as soon as they are rooted. They're fed the full strength lucas formula (8/16) through the whole cycle. When i move the lights any higher than 10 inches from the canvas the result is nutrient burn. I'm also skeptical of this light theory as i've never seen buds thin out as they grow closer to the lights. I've had colas literally touching the glass of 600w hoods(so about 5-6 inches from the bulb) and as long as i kept them cool with a fan they where always fatter than more distant buds.

 

[IAm5toned]

im willing to bet a paycheck those using hydro have far less problems than those using soil with light burns..... just my .02.

ill shut up now

 

[Shrubs First]

In my experiences I've never seen to much light. I use a 1000 watts on my clones as soon as they are rooted. They're fed the full strength lucas formula (8/16) through the whole cycle. When i move the lights any higher than 10 inches from the canvas the result is nutrient burn. I'm also skeptical of this light theory as i've never seen buds thin out as they grow closer to the lights. I've had colas literally touching the glass of 600w hoods(so about 5-6 inches from the bulb) and as long as i kept them cool with a fan they where always fatter than more distant buds.

Too bad no pics. And this being your 12th post here doesn't help with credibility
either.

 

[Giyan]

My seedlings were on 20/4 and the leaves are "praying" they were 1in from cfl is this the light also the very tips turning yellow no nutes water was sitting out 24 hrs or more

 

[nickfury510]

Too bad no pics. And this being your 12th post here doesn't help with credibility
either.

i dont know about his credibility but i veg under 1000w hps everytime with no issues.

and yes...it is possible to give a plant too much light while they are young...but never during flower just so long as your lights stay cool to the touch...

this is about 3 weeks into flowering and they hood is around 2' away..by the time i reach the final 6-9 weeks im within 18-16" from canopy top

 

[Shrubs First]

i dont know about his credibility but i veg under 1000w hps everytime with no issues.

and yes...it is possible to give a plant too much light while they are young...but never during flower just so long as your lights stay cool to the touch...

this is about 3 weeks into flowering and they hood is around 2' away..by the time i reach the final 6-9 weeks im within 18-16" from canopy top

Do you clone under a 1000 watt as well? I can't hate on your setup... I dont care
what you are growing or how big it is. Only think I don't agree with is HPS.

This kid is claiming his colas are TOUCHING the glass of his 600W HID hoods.....
I'm using Metal Halides and my colas could never do that, if he is using HPS,
there is no way that is possible.

 

[nickfury510]

Do you clone under a 1000 watt as well? I can't hate on your setup... I dont care
what you are growing or how big it is. Only think I don't agree with is HPS.

This kid is claiming his colas are TOUCHING the glass of his 600W HID hoods.....
I'm using Metal Halides and my colas could never do that, if he is using HPS,
there is no way that is possible.

clones go under t8s till they root and then directly into the big room around the perimiter and the light pulled all the way up until the transplant takes. within a week of being moved into the room they are directly under the 1000w around 4' away i veg between 2-3 weeks and then flip. i let the plants do their stretch and then start moving the light closer until im within 18-16" from canopy top. the only reason i dont put the light closer is due to area coverage. as far as a cola growing up to the glass of a 600w hid its completly possible as long as your light is cool to the touch. it happens all the time. i dont have any pics of it personaly but they are on this forum. fdd2blk has posted them... also due to my short veg time i would gain no real benefit from vegging with MH so i stick with the hps all the way through. im sure you will beg to differ as alot of mh users do but just know that ive been doing this for a while and I do okay for myself

 

[Shrubs First]

I just don't use HPS, veg or flower, veg in flourescent, flower in Halides.

I hate that yellow/green light HPS puts out. But since we're postin pics here

 

[Phyzix]

I am far from an expert, but I was under the impression that plants would simply absorb as much light as possible up to a certain amount of lux, and after that it will simply be absorbed by the plant as heat or reflected as color. If this is the case then indeed FAR too much light could create enough warmth on leaves to cause burning, but I suppose it's debatable if that is too much light or simply not enough ventilation.

As for too many (power-wise) light rays damaging the leaves, I don't see how this is possible because the plants can limit light absorption to the cells.

 

[riddleme]

I am far from an expert, but I was under the impression that plants would simply absorb as much light as possible up to a certain amount of lux, and after that it will simply be absorbed by the plant as heat or reflected as color. If this is the case then indeed FAR too much light could create enough warmth on leaves to cause burning, but I suppose it's debatable if that is too much light or simply not enough ventilation.

As for too many (power-wise) light rays damaging the leaves, I don't see how this is possible because the plants can limit light absorption to the cells.

Happens all the time if ya want to see it just google "light bleaching leaves" first thing that comes up is RIU