Seedling leaf discoloration

iztik

iztik

Well-Known Member
Hi there!

This is my first time growing indoors with an LED light.

I have 5 seedlings that are 10 days old that started to show some discoloration on the leaves, as well as curling down on the tips.

no nutes added yet, using lightmix as soil.

Im worried this might be caused by ph although I use ph 6/7 water.

B9E4E431-56ED-46BB-B727-8D01BDCC47DF.jpeg

What do you think? Should I be worried about something or is this normal?

thanks a lot!
 
iztik

iztik

Well-Known Member
Thanks for the input! I’ll keep an eye on them to see how it evolves

LED is lumatek 200w and the distance is 16 inches, at 80% power
 
Dank Bongula

Dank Bongula

Well-Known Member
iztik said:
Thanks for the input! I’ll keep an eye on them to see how it evolves

LED is lumatek 200w and the distance is 16 inches, at 80% power
Click to expand...
That's a nice looking light for sure. It may be showing a little light stress, with the plant so little...if it pulls 200 from the wall, dialed down you are at around 150-160 watts at 16in...but it isn't praying yet so, but you'll wanna keep an eye on that as it grows and your intensity is dialed up.
 
iztik

iztik

Well-Known Member
Dank Bongula said:
That's a nice looking light for sure. It may be showing a little light stress, with the plant so little...if it pulls 200 from the wall, dialed down you are at around 150-160 watts at 16in...but it isn't praying yet so, but you'll wanna keep an eye on that as it grows and your intensity is dialed up.
Click to expand...
Thanks! I’ve been wondering about light stress as this is my first time using LED.

In the meantime I decided to raise the light a couple more inches and see how they react. It might be a little light stress as you mentioned.
 
jcdws602

jcdws602

Well-Known Member
Its is certainly a learning curve using leds. The recommended ppfd for a young plant is 150-200. So there is a strong possibility it could be light stress as mentioned before. Also your humidity is rather low. Between 60%-70% would be ideal.
 
H

Hash Hound

Well-Known Member
iztik said:
LED is lumatek 200w and the distance is 16 inches, at 80% power
Click to expand...
I think that's a bit close for seedlings, I have a 65w QB . For their boards they recommend 30 for seedlings, 24 after 2 weeks, gradually going to 18, then 12-18 for flowering. I didn't find any info on Lumatek site about hanging distances, nice looking light by the way.
I occasionally noticed weird leaf coloration's since I've switched from cfl to led for vegging.
 
iztik

iztik

Well-Known Member
Thanks Hash Hound! I’m gonna move the lights up a little more. Do you think I should raise it or lower the power?

I’ll try to raise the humidity a bit.

I am also experimenting with bottom feeding.The pots are in a tray and I have a water deposit that is connected to the tray and the water level is regulated by a aquavalve.

The bottom of the pots have a few inches of perlite. The pots are 60% perlite, 40% soil.

What do you guys think about this setup? It’s my first time doing this type of irrigation too! :)

Thanks again for everyone’s input!
 
LowRange

LowRange

Well-Known Member
iztik said:
Getting around 26k, what do you think?
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For the lux? This is a general guide:

  • Clones and seedlings: 5,000–7,000 lux
  • Vegetative growth: 15,000–50,000 lux
  • Flowering: 45,000–65,000 lux
So at 26,000 lux you are driving it pretty hard for a seedling.
 
iztik

iztik

Well-Known Member
Thanks for the reference values!
Yeah looks like I might be causing them light stress, gonna lower the power and see how they react.
 
Fuckingatodeaso

Fuckingatodeaso

Member
24c is a little low for leds. Try bumping it up. Going from 75f to 82 and up helped me tremendously when I was adjusting to leds from hps.
Leds don't put out lots of infrared radiation like the hps and so the leaf temp is lower.
 
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