Leggy seedlings with led?

thisusernameisnottaken

thisusernameisnottaken

Well-Known Member
What's the cause of leggy seedlings when using white led? Even though they are getting 10k lux they get leggy, never had this problem with purple led.
 
ProPheT 216

ProPheT 216

Well-Known Member
Distance. Seeds can only take so much light. So we tend to leave them under illuminated and they stretch a little. You can burry all that stem tho don't worry. I don't do anything special for my seeds. I put them extra far from my veg lights and let them get to their first 3 finger leaves before I move them closer to light add introduce feed.
 
thisusernameisnottaken

thisusernameisnottaken

Well-Known Member
kwigybo88 said:
What sort of led do you use and how far away from the seedlings to you keep it?
Click to expand...
Cob cree 3070 55w at 50/60cm 7-10k lux.

ProPheT 216 said:
Distance. Seeds can only take so much light. So we tend to leave them under illuminated and they stretch a little. You can burry all that stem tho don't worry. I don't do anything special for my seeds. I put them extra far from my veg lights and let them get to their first 3 finger leaves before I move them closer to light add introduce feed.
Click to expand...
But why do they get leggy when they are getting so much lux, never had this problem with purple+lenses?
 
kwigybo88

kwigybo88

Well-Known Member
Depends how many cobs he's using tho, if theyre 190 per chip.

I've never had leggy seedlings under samsung lm301's or vero29se's.
 
amneziaHaze

amneziaHaze

Well-Known Member
well i had 60W and i had to keep it really close 1696512540729.png i dont even use my 300W on 60cm thats super far away
 
thisusernameisnottaken

thisusernameisnottaken

Well-Known Member
Prawn Connery said:
Because according to this calculator, you are only giving them 190 PPFD, which is practially fuck all.

10,000 LUX, 3000K LED

Convert Lux to PPFD - Online Calculator | Waveform Lighting

Online calculator to convert illuminance (lux) to PPFD (micromoles per second per meter squared).
www.waveformlighting.com www.waveformlighting.com
Click to expand...
How many lux do seedlings need 5000-7000?

kwigybo88 said:
Depends how many cobs he's using tho, if theyre 190 per chip.

I've never had leggy seedlings under samsung lm301's or vero29se's.
Click to expand...
My purple led from 2012 performed better.

amneziaHaze said:
well i had 60W and i had to keep it really close View attachment 5332892 i dont even use my 300W on 60cm thats super far away
Click to expand...
I use cob.
 
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Medskunk

Medskunk

Well-Known Member
Just lower the light by a couple of inches at a time. That ll do it. As mwntioned above you can plant the whole stem so all good.
 
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