DE killing plants at 5'

[sgrowdum]

5X3 closet
8.5' ceilings
9k AC
C02
80* temps at canopy
45-70% RH
(5) 5 gallon smart pots 100% coco
Light is 5' away currently
Jacks 3/2/1 750-1000ppm

So I've determined that my DE lights at the 1000watt setting are just too much for my 5X3 closet. The plants starting acting up a few weeks back (yellowing at the centers and leaves curling upwards) i thought I was over feeding so I ditched the soil and jumped to coco. I gave the plants a week to recoup from the transition and the color started to come back and growth began again.

Last night I did a light fan leaf trim and flipped the lights from 750 to 1000 to test. This morning at 9am I took a look and the leaves started to curl back up...

Soooooo my question is which would be the better choice, turning the lights back to 750 or running my old 1000w light? Which would give me better results? I don't have a PAR meter sonic but sure.

 

[Getgrowingson]

Set back on 750 get them recovered and boost nutrients once recovered and go back to 1000 in bloom

 

[sgrowdum]

Set back on 750 get them recovered and boost nutrients once recovered and go back to 1000 in bloom

This is my initial thought but once in flower if they suffer the same fate I'll be SOL. Also once flower time is here they will be closer to 4' maybe 3.5' from the light. It seems like the problem would just get worse.

 

[sgrowdum]

Anyone have any PAR readings from the different setting on the DE lights? I'd love to know the differences from them vs. a standard 1000w setup

 

[MMJ Dreaming 99]

5X3 closet
8.5' ceilings
9k AC
C02
80* temps at canopy
45-70% RH
(5) 5 gallon smart pots 100% coco
Light is 5' away currently
Jacks 3/2/1 750-1000ppm

So I've determined that my DE lights at the 1000watt setting are just too much for my 5X3 closet. The plants starting acting up a few weeks back (yellowing at the centers and leaves curling upwards) i thought I was over feeding so I ditched the soil and jumped to coco. I gave the plants a week to recoup from the transition and the color started to come back and growth began again.

Last night I did a light fan leaf trim and flipped the lights from 750 to 1000 to test. This morning at 9am I took a look and the leaves started to curl back up...

Soooooo my question is which would be the better choice, turning the lights back to 750 or running my old 1000w light? Which would give me better results? I don't have a PAR meter sonic but sure.

Do you have fans going? 80 Deg is a bit high. Humidity range is a bit wide.

 

[sgrowdum]

Do you have fans going? 80 Deg is a bit high. Humidity range is a bit wide.

I have a lot of air movement. The temp doesn't bother me but I agree the RH range jumps a bunch. It's probably more consistantly in the 45-55% range. While I agree that's low I don't think it's low enough to be causing the issues I'm seeing. It's note worthy to mention that the plants grew relatIvely well under the 1000w setting until they reached around 14". At this distance the canopy is about 5'5" from the light.

 

[MMJ Dreaming 99]

I have a lot of air movement. The temp doesn't bother me but I agree the RH range jumps a bunch. It's probably more consistantly in the 45-55% range. While I agree that's low I don't think it's low enough to be causing the issues I'm seeing. It's note worthy to mention that the plants grew relatIvely well under the 1000w setting until they reached around 14". At this distance the canopy is about 5'5" from the light.

14" from a DE? This would be like microwaving the plants. Turn it down to 750 w if you can.

 

[sgrowdum]

Letting them chill out under some T5's

 

[sgrowdum]

14" from a DE? This would be like microwaving the plants. Turn it down to 750 w if you can.

Plant height

 

[sgrowdum]

Man I don't know where this 3' rule of thumb came from... at 5' the light is too much. After 36hrs under floros these things are back to life. Am I missing something here? Doing something wrong?

 

[Carolina Dream'n]

I have a lot of air movement. The temp doesn't bother me but I agree the RH range jumps a bunch. It's probably more consistantly in the 45-55% range. While I agree that's low I don't think it's low enough to be causing the issues I'm seeing. It's note worthy to mention that the plants grew relatIvely well under the 1000w setting until they reached around 14". At this distance the canopy is about 5'5" from the light.

Your humidity is too low. Your plants can't transpire fast enough to compensate. Therefore they droop and have nutrient deficiencies.

 

[MMJ Dreaming 99]

Plant height

Shit - those are almost babies. Babies are pretty gentle still under DE. Turn that DE down bro to 750 watts or even lower or stick with the T5 for vegging. I have vegged babies with a SE 1000 watt MH but I kept them about 6.5 to 7 feet above the plants with fans blowing and the temps were 75 deg F or so.

Also, I had to battle to keep the RH above 50%. In veg, you should be closer to 60% RH, as Carolina Dreamin is suggesting. You can use a wet towel to raise the humidity or buy a cheap cool vaporizer at Wal Mart. About $20.

 

[Carolina Dream'n]

Shit - those are almost babies. Babies are pretty gentle still under DE. Turn that DE down bro to 750 watts or even lower or stick with the T5 for vegging. I have vegged babies with a SE 1000 watt MH but I kept them about 6.5 to 7 feet above the plants with fans blowing and the temps were 75 deg F or so.

Also, I had to battle to keep the RH above 50%. In veg, you should be closer to 60% RH, as Carolina Dreamin is suggesting. You can use a wet towel to raise the humidity or buy a cheap cool vaporizer at Wal Mart. About $20.

Commercial grade humidifier. $300. Only real option.

 

[sgrowdum]

Your humidity is too low. Your plants can't transpire fast enough to compensate. Therefore they droop and have nutrient deficiencies.

Where I agree 50% is low I don't think the RH is low enough to describe what you are saying. I've run grows with less humidity with zero issue but then again I was using standard mogul style bulbs. With that said Look at the Chart I posted. I'm just a hair outside of the ideal efficiency range at 79* and 50-55% RH.

 

[cindysid]

I love my t5s for seedlings. I sometimes switch over to led once they get past the seedling stage, but the t5 is hard to beat.

 

[MMJ Dreaming 99]

I love my t5s for seedlings. I sometimes switch over to led once they get past the seedling stage, but the t5 is hard to beat.

I am not trying to tell the dude what to do, but I would back off 1000 watt DE until he is in flower. Stick with T5 or dim the DE as much as he can.

 

[sgrowdum]

I am not trying to tell the dude what to do, but I would back off 1000 watt DE until he is in flower. Stick with T5 or dim the DE as much as he can.

The DE hasn't been on the 1000 setting for a while now. After it almost took out the plants I turned it off. The girls have been under T5's for the last 2 days and are loving it.

What I'm leaning towards now is a standard SE 600w for veg and when they are ready to flip I'll start the DE at 600 and work my way up as the plants progress

 

[PSUAGRO.]

You have to adjust your watering habits, fertilizer regiment with high canopy temps/co2 enrichment/ high umol/s from the DE @ 1000w+. The light distance is fine, more heat & photons=more water and nutrient requirements; simple.

That's why the T5's are making them recover, less demand on the plants, slower transpiration rates ..........anyone whos grown outdoors under full sun(2000+ umol/s) knows how fast they burn through water/ferts if not planted directly into the ground

good luck

 

[Carolina Dream'n]

Where I agree 50% is low I don't think the RH is low enough to describe what you are saying. I've run grows with less humidity with zero issue but then again I was using standard mogul style bulbs. With that said Look at the Chart I posted. I'm just a hair outside of the ideal efficiency range at 79* and 50-55% RH.

Has more to do with light intensity then temperature.

 

[sgrowdum]

You have to adjust your watering habits, fertilizer regiment with high canopy temps/co2 enrichment/ high umol/s from the DE @ 1000w+. The light distance is fine, more heat & photons=more water and nutrient requirements; simple.

That's why the T5's are making them recover, less demand on the plants, slower transpiration rates ..........anyone whos grown outdoors under full sun(2000+ umol/s) knows how fast they burn through water/ferts if not planted directly into the ground

good luck

Are you suggesting that 1000ppm is not enough for a 14" tall plant under a DE? When they were in soil I was feeding once every 3 days or so as that's all the were drinking. Now in coco I'm feeding once a day 1000ppm solution. Starting tomorrow I was going to expierment with twice a day