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Old May 7, 2018   #1
mobiledynamics
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Default No Hardening with LED

I'm not sure where to post this. In the SS or the general forum...

I observed that when I took my seedling off my new LED lights, they seemed less stressed. The plants were healthy though - bushy foliage, slow elongation of growth (maybe more squat and bushy)....

Anyhow, I did a test this year. I did have some backups in 1G if my test failed. I did not do a full slow harden off transition cycle. I did put them on my covered porch for 2 days just so they got acclimated to ~fresh air~. I even have some some very small transplants as well - which got a late start on germinating.

All of them fared fine in the sun, with no leaf burn. We even had 2-3 days of abnormal record setting temps that hit like 15-20 degrees higher than normal. Would someone concur the same and say maybe the LEDS due to the direct light played some role in the fact that I did not need to do a full harden off ?
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Old May 8, 2018   #2
Harry Cabluck
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This is worth a looksee if interested in use of LEDs: https://fluence.science/blog/redefin...ewsletter-2018
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Old 3 Weeks Ago   #3
PlainJane
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Interesting article.
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Old 3 Weeks Ago   #4
Nematode
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Mobile,
What is your led setup, brand, wattage, spacing, height etc?
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Old 3 Weeks Ago   #5
Cole_Robbie
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That is a good article.

LEDs do not contain UV light, which I would think is the most important part of getting them used to real sunlight.
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Old 3 Weeks Ago   #6
Koala Doug
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Quote:
Originally Posted by Cole_Robbie View Post
LEDs do not contain UV light



Most LED lights do not have UV... but some specialty grow light companies do offer UV versions. It's pretty uncommon though.
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Old 3 Weeks Ago   #7
rhines81
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Quote:
Originally Posted by Cole_Robbie View Post
That is a good article.

LEDs do not contain UV light, which I would think is the most important part of getting them used to real sunlight.
I agree and that can be an issue for not hardening off. I hate hardening off though, but I try to plant out on cloudy days if possible. I've had white leaf plenty of times, from UV burn but nothing tragic. I don't think I ever lost a plant from not hardening off... they just get ugly for a week or so. The more cloudy days in a row after planting the better. I've done the whole hardening off routine several times and it is just a hassle (I'll usually get them outside once or twice for a few sunny hours the week before planting though)
I also use fans indoors, so that makes them used to some wind (not gusts though).
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Old 3 Weeks Ago   #8
Nematode
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Cole, that was my thought.
But I was wondering if the high intensity alone could induce a uv protective response in the plants.
It is not obvious to me why uv protection in plants would be decoupled from overall intensity.
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