1000w light, height problems?? Burning plants?

[sensirocker]

Hello everyone,

I have my 1000w light hanging at 13" from the top most cola, and it seems like its yellowing out the leaves a bit. So im wondering, is it ok to get some yellowing on that one center area because im getting the surrounding plants solid light? (they arent yellowing, just some in the center) What is the right hight for a 1000w hps? Am i actually hurting them by bringing it too close?

temps are at 82 during the day, aircooled hood, no nute problems.

thanks,

sR

 

[Skunkenstein]

Taller ceiling,,deeper floor..shorter strain

Taller ceiling,,deeper floor..shorter strain

I have a good buddy that has dealt with that prob for quite some time.I changed it for him by introducing Lui to the scene..flip em at 18-20inches..they mature at 36-40inches. Another thing to try,if you're Not perpetual harvest is..36 hours of Darkness prior to the flip.It will reduce stretch considerably.1000's put out Bu-kue Lumens..you could have you're plants feet away, and they are still getting adequate light.Rotate you're plants aswell,if in soil.Those big cola's unfourtunately get burned by the radiation once their that close. In the future a light mover and a good compact strain might help you out..Cheers

 

[Guest]

Skunk I'm interested in how giving a plant dark hours reduces stretch,that goes against everything I've experienced growing weed.If you want to reduce stretch,I've found keeping lights as close as humanly possible to be the best and really only way.Its like denying a seedling light when it breaks ground,it's gonna stretch to high heaven.I believe giving a plant dark hours in the middle of growth will have the same effect.If I'm incorrect point me in the right direction for confirmation.When my vegging p[lants get really tall,some of the ones under the 1K MH will experience bleaching on the uppermost fans,severity is a factor of course but personally I've never experienced anything negative but some fan discoloration.Can't be good,get a non-oscillating fan that blows inches under the lens and that may help some,thats what I did.And use a cool mist humidifier on vegging 80+ degree plants dammit!

 

[sensirocker]

i have an oscillating fan, how far do you guys hang your 1000w'er from the canopy? The nugs are still growing strong, i just want to figure out if the light is too intense, to where its actually hurting the plant rather than giving it shit loads of good light....

 

[Lucid]

tooo much light .... back that 1000wer off


i keep my 1000w cooltube 16-20 inches depending on strain

each strain requires different things then others, light intensity is one of them ...

 

[tru-smoker]

18-24in. should be good

 

[SEEDYNONO]

yep try to move them and turn them around don't keep the same ones right under it the whole grow if you can avoid it.

 

[Guest]

I get my air-cooled 1k about 14- 16in in flower and 18- 20 in veg. So you guys get bleaching with your air cooled hoods? I suspect I can get mine even closer if I put a fan blowing right at the glass but really there is no need 1k's rock!

 

[sensirocker]

ok, thank you everyone, im gonna try to go with 16 inches and see what happens, i just dont want to lose out on yeild, even though theyre doing great right now so im sure it will be fine. Also I dont really want to rotate this batch because theyre huge in 7 gallon buckets and im already having problems supporting the nugs... ill rotate the next ones which will hopefully be smaller... thanks for all of the help!!!

-sR

 

[Guest]

Mine are at 16 inches right now but th last week or 10 days they will be a lot closer,8 inches maybe.Dont really like getting them that close but the fixtures hang from the closet bar and I can only go so high.Someone made a great point earlier,theres gonna be a 1 by 1 or slightly larger "hot spot that plants shouldnt spend more than 6 or 8 hours in especially in situations like mine,when I gets like that I have to be aware and move plants intermittently.For 100 bucks you can get a lazer themometer and have no more questions about canopy,temps,I veg at 85 with a cool mist humidifier all the time with great results.I question the optimumness of 75F if thats a word lol.Optimality?

 

[Guest]

Sensi rocker is your 1000watt air cooled? If not... look into it, I heard it reduces these problems considerably.

 

[Guest]

Alien do me that flavor in equip forums man,tell me what ed says about reducing co2 end of flower prease.Does he mention temps?Does he give any reason for reduction of potency or quote any studies?Does he use crest colgate or sensydine?

 

[Skunkenstein]

Smilin bob..

Smilin bob..

That 36 hr dark period is a little trick Arjan from greenhouse uses for growing hazes to keep them from growing through the roof..It Snaps them into the flower mode.There has been some actual research conducted..36hrs is the majic number!!

 

[Guest]

OK I can see that,must not help yield much though as foliage is normally packed on during the stretch,maybe a good idea if you're into indoor hazes which arent the best yielders anyway normally

 

[yellowthumb]

In Ed R.'s 'Closet Cultivator' book he says to cut the Co2 off @ 1 week before harvest because:

1. There isn't much growth going on

2. It is possible that the gas hinders some of the plants odors.

That's all he says in that book.

 

[sensirocker]

yeah my hood is aircooled....

 

[Guest]

Hello everyone,

I have my 1000w light hanging at 13" from the top most cola, and it seems like its yellowing out the leaves a bit. So im wondering, is it ok to get some yellowing on that one center area because im getting the surrounding plants solid light? (they arent yellowing, just some in the center) What is the right hight for a 1000w hps? Am i actually hurting them by bringing it too close?

temps are at 82 during the day, aircooled hood, no nute problems.

thanks,

sR

The closer you can get the light without burning your plants, the better. There is no such thing as too much light, just too much heat.

When you say it's 82 degrees, is that the average room temp or the temp at the top of the buds?

During the winter, when I'm pumpimg 40 degree air through the 1K air cooled light, I can actually put my hand on the glass tube and it's cold. I was able to get the 1K light 10-12 inches from the tops. 140,000+ lumens, and they were fine. It's all about temp at the budsite.

This spring I'm really noticing the difference with 75 degree air going through the hood instead of 40 degrees.

Get a small proble and see what the air temp is at the top bud site. Keep it under 85 and you're good!

 

[Guest]

KK for yopur own knowledge bro I used to think along those same lines,you cant give cannabis enough light though heat is another matter.In reality,you definately can give cannabis too much light,its rare but I've experienced bleaching myself to a small degree,others to a much larger degree.I remember a thread where a man was using 8 600s for his tables,his growth and yields were not adequete until he removed two of the 600s,then it was a new ball game.Be aware this is absolutely strain dependent,but also be aware that you can give certain pheno's too much of a good thing.I didn't believe it at first either man,but being around for awhile has convinced me 100%

 

[reaperz]

arnt 600 the same power as 1000 because with 1k you have to keep them higher, while with 600 you can get them lower? light intensity more the lower you go.

 

[Guest]

ok, thank you everyone, im gonna try to go with 16 inches and see what happens, i just dont want to lose out on yeild,

-sR

Like burning the tops HELPS?

Just like with nutes, usually a little less can actually be MORE.
I started using a mover because I can get the light REALLY close, but the plants didn't do as well as when I backed the light off. Now I use long delay with the light about 15-18 inches away and get big buds on both ends and a nice low(er) exposure area down the center for new plants to flower area
If your hood has hot spots,, and the hood is stationary - you will need to keep shorter plants in that spot.
Also - plants can get closer as the adjust to canditions.

It takes sick and wounded plants so long to heal,,, I try to avoid anything that stands a higher probability of damage than help.