Want to see light stress at 3 feet away with a 1000k?

[richyrich]

Beware of 1k lights running hortilux bulbs. I have been running them for years and I have always seemed to run into what seemed to be magnesium deficiencies or other problems even though I knew I was doing nothing wrong.

Here is what some of my plants looked like under their 600 watter at 16 inches from the canopy.


Then I go and put a 1000k over them and in 2 days boom.


This is with a nearly perfect environment and the bulb and hood 3 feet away. I have light stressed plants before and they usually have leaf bleaching or the taco leaves. Now, this is fucked up because at this distance I did not suspect them to have any light stress. Canopy temps were 75-79F measured with a infared temp gun. Temps were in line with all advice to be found. The most messed up part is that it looks like total magnesium deficiency. Notice the thin spindly new growth, tacos leaves, upturned leaf tips. It looks like a lot of problems going off at one time. What bullshit! How far away is a 1000k really suppose to be from the canopy.

For the few people that mentioned IR and light stress, well here is the proof. MFer, i tossed the 1000s and got all 600s.



This last pic is at 4 feet away and is still showing healthy leaves. But, just a few inches above and I see the first signs of light stress. Screw 1000s.

 

[EthnobotanicA]

I have seen sensitivity to the lights too, but only when there is some other factor. Examples would be moving directly from flouro's or another smaller light, and my neighbor spraying cars (acetone and voc's). Look into some other cause, although it sounds like you took care of it by switching to 600's.

 

[terminalc]

I've got some plants in my gallery that look similar to yours. I'll go ahead and raise my 600s another 1' that will be 3' total. I don't figure it can hurt anything as they aren't growing at optimal anyway. Were your lower branches getting chlorosis or just the tops? I have compact nodes stunted growth not spindly growth, so maybe its something different.

 

[reverev313]

use what works for u good looking plants bro

 

[D.I.trY]

For the few people that mentioned IR and light stress, well here is the proof.

I agree! Very useful post, thankyou. What I like about you is whatever you discover you tell us all about it - so many here dont take that duty even half as serious as you do. On behalf of many I say thakyou, and how ironic that after all that rubbish before we come together on another subject. I hope we can condiser each other as a true friend on icmag, because i know I already do!

I've been suspecting that the temperature of the ambient air is not the whole story. This is happenning still when leaf temps are good, air temp good, air movement good. Thing is IR is a wavelength of light, and even though leaf temperatures can still be measured as normal, we can end up delivering far more of the IR spectrum of light than is present in sunshine.

How can we assume that the plant will not react adversely to an overdose of IR when it hasnt seen it during millions of years of evolution (ok I dont know how old mj is but have a guess hey!). It seems to be effecting the areas of new growth - i.e. cell division. I stopped compulsory biology lessons long ago so i'm not going much further here, maybe someone can take the batton, but IR does not seem good for plant growth.

Obviously the glass on a 1000W bulb is hotter than a 600W bulb and this is delivering immense amount of IR if there isnt really good cooling directly onto the bulb - like you were blowing a burn on your skin should you burn yourself. I'll assume all commercial dutch grows (like you would see on discovery's How its Made) have well designed air cooled hoods linked to immense ventilation to run their 1000w's.

 

[TheDude#1]

Hey all,
I have a 600w as well in a 1.2m x 1.2m area approx 2 ft above the canopy and have got similar problems and thought it was due to a Mg deficiency. Could it be light stress?
I have a fan oscilating in there as well as an extractor. And i have just tried on of those heat shields you attach to your reflector to see if this helps. Do you think it would help a little?

 

[Duckmang]

I got a little burn like that when the timer on my 1500W infrared didn't click off. Took about two days to show it. When I found it still on the following morning the leaves looked fine. Didn't seem to hurt the plant overall and the buds still look fine.

 

[RockyMountainHi]

I started my new crop today under the 1000W Hortilux

- I'm thinking 28-ish inches above, but I use good A/C hoods and a 5 foot light rail.

if I keep the temps 75 F,, looks good,, 77 starts looking beat up

Almost 1/2 way thru lights off time - I wana go check on em

Kinda like Nerious Nelly

 

[C3RTIFI3D]

Those are nice plants BTW

 

[JohnnyToke]

could it be the reflector? I have my 1000w eye horti sitting 16" over the tops and I'm not seeing that. my reflector is the adjust-a-wing. I keep my plants fed to 1000 - 1400 ppms (.7). it is interesting you arent getting the same issues from the 600.

JT

 

[RockyMountainHi]

I was wondering if it's the spot under the lamp too.

could be a hot spot - kinda like a focal point - but dam I hate seeing crispy gardens.

I've got SusSystem II hoods and my plants are 30 inches away - on the mover and after the first day - things are looking very good.

 

[richyrich]

I was wondering if it's the spot under the lamp too.

could be a hot spot - kinda like a focal point - but dam I hate seeing crispy gardens.

I've got SusSystem II hoods and my plants are 30 inches away - on the mover and after the first day - things are looking very good.

I'm running the same hoods and I am still suspicious of them causing hot spots. I read a few other posts with it mentioned. I am not air cooling them this time. But, in the past I always ran cool tubes with bat wing reflectors and 3-4 weeks into bloom the plants grew vertical and I ran out of head room (even though the hood was still 30" away from the canopy) and I would see the same symptoms. I always thought I was running into deficiencies and couldn't figure it out. Now, when I look back it all makes sense. Now with the 600s I am golden.

 

[richyrich]

Those are nice plants BTW

Thx

 

[richyrich]

could it be the reflector? I have my 1000w eye horti sitting 16" over the tops and I'm not seeing that. my reflector is the adjust-a-wing. I keep my plants fed to 1000 - 1400 ppms (.7). it is interesting you arent getting the same issues from the 600.

JT

Could be. Adjust a wings do not concentrate the light as good as a hood, therefore, there are no hot spots or focal points created.

 

[richyrich]

I started my new crop today under the 1000W Hortilux

- I'm thinking 28-ish inches above, but I use good A/C hoods and a 5 foot light rail.

if I keep the temps 75 F,, looks good,, 77 starts looking beat up

Almost 1/2 way thru lights off time - I wana go check on em

Kinda like Nerious Nelly

You are probably okay with a light rail.

 

[richyrich]

Hey all,
I have a 600w as well in a 1.2m x 1.2m area approx 2 ft above the canopy and have got similar problems and thought it was due to a Mg deficiency. Could it be light stress?
I have a fan oscilating in there as well as an extractor. And i have just tried on of those heat shields you attach to your reflector to see if this helps. Do you think it would help a little?

That is exactly what the heat shields are suppose to do. They are to disperse the hot focal point in the center and spread it around more with the use of a hood. I didn't bother trying them though.

 

[richyrich]

I agree! Very useful post, thankyou. What I like about you is whatever you discover you tell us all about it - so many here dont take that duty even half as serious as you do. On behalf of many I say thakyou, and how ironic that after all that rubbish before we come together on another subject. I hope we can condiser each other as a true friend on icmag, because i know I already do!

I've been suspecting that the temperature of the ambient air is not the whole story. This is happenning still when leaf temps are good, air temp good, air movement good. Thing is IR is a wavelength of light, and even though leaf temperatures can still be measured as normal, we can end up delivering far more of the IR spectrum of light than is present in sunshine.

How can we assume that the plant will not react adversely to an overdose of IR when it hasnt seen it during millions of years of evolution (ok I dont know how old mj is but have a guess hey!). It seems to be effecting the areas of new growth - i.e. cell division. I stopped compulsory biology lessons long ago so i'm not going much further here, maybe someone can take the batton, but IR does not seem good for plant growth.

Obviously the glass on a 1000W bulb is hotter than a 600W bulb and this is delivering immense amount of IR if there isnt really good cooling directly onto the bulb - like you were blowing a burn on your skin should you burn yourself. I'll assume all commercial dutch grows (like you would see on discovery's How its Made) have well designed air cooled hoods linked to immense ventilation to run their 1000w's.

Right on DItrY. You were one of the folks that talked about IR and light stress that I mentioned. Thanks for the hint in that direction to make me suspicious to find the problem.

 

[10k]

Richyrich,
I'm still trying to figure out who "MFer" is ?

 

[richyrich]

Richyrich,
I'm still trying to figure out who "MFer" is ?

LOL, I was expressing myself. Mother F**cker (MFer).

 

[asher1er]

any reason why we would see this on the 3rd crop and not the first two? nothings changed, same strain n all.. never seen such effects until now and was thinking mg and ca def at first but this shouldnt be the case..