Leggy seedlings with led?

[thisusernameisnottaken]

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.

 

[kwigybo88]

What sort of led do you use and how far away from the seedlings to you keep it?

 

[ProPheT 216]

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.

 

[ProPheT 216]

 

[thisusernameisnottaken]

What sort of led do you use and how far away from the seedlings to you keep it?

Cob cree 3070 55w at 50/60cm 7-10k lux.

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.

But why do they get leggy when they are getting so much lux, never had this problem with purple+lenses?

 

[Prawn Connery]

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

 

[kwigybo88]

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]

well i had 60W and i had to keep it really close i dont even use my 300W on 60cm thats super far away

 

[thisusernameisnottaken]

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

How many lux do seedlings need 5000-7000?

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.

My purple led from 2012 performed better.

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

I use cob.

 

[PopAndSonGrows]

10k lux isn't very intense. More like 20-25k would probably keep a seedling from stretching.

 

[thisusernameisnottaken]

10k lux isn't very intense. More like 20-25k would probably keep a seedling from stretching.

Why do most recommend 5-10k lux?

 

[PopAndSonGrows]

Why do most recommend 5-10k lux?

Who is "most"? Because clearly most ppl in this thread do not.

 

[thisusernameisnottaken]

Who is "most"? Because clearly most ppl in this thread do not.

If you search lux recommendation for seedling most say 5-10k lux.

 

[PopAndSonGrows]

10 yrs ago, maybe

Nobody in cannabis uses "lux" anymore

 

[rkymtnman]

what light cycle? room temps?

 

[amneziaHaze]

If you search lux recommendation for seedling most say 5-10k lux.

maybe your meter is lying.but just put the lamp closer why are you stressing soo much?

 

[thisusernameisnottaken]

10 yrs ago, maybe

Nobody in cannabis uses "lux" anymore

You just convert lux to whatever.

what light cycle? room temps?

12/12 23-24c.

 

[Medskunk]

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.

 

[thisusernameisnottaken]

maybe your meter is lying.but just put the lamp closer why are you stressing soo much?

Maybe? Also I am here for info.

 

[thisusernameisnottaken]

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.

Lowered to 14k lux.