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-   -   No Hardening with LED (http://www.tomatoville.com/showthread.php?t=47453)

mobiledynamics May 7, 2018 08:17 PM

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 ?

Harry Cabluck May 8, 2018 08:19 PM

This is worth a looksee if interested in use of LEDs: https://fluence.science/blog/redefin...ewsletter-2018

PlainJane December 22, 2018 09:28 PM

Interesting article.

Nematode December 23, 2018 11:59 AM

Mobile,
What is your led setup, brand, wattage, spacing, height etc?

Cole_Robbie December 23, 2018 04:50 PM

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.

Koala Doug December 23, 2018 07:57 PM

Quote:

Originally Posted by Cole_Robbie (Post 721909)
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.

rhines81 December 23, 2018 08:19 PM

Quote:

Originally Posted by Cole_Robbie (Post 721909)
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).

Nematode December 23, 2018 08:20 PM

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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