Green light; officially not safe for light out viewing?

Nizza said:

I thought he was saying that it is important for photosynthesis there, but also saying that the green/blue light doesn't effect the photoperiod ("flowering") if it's strictly green/blue as in LED (he also says fluoro)?
I get what your saying though, i'm interested in that
where can i read more about his LED experience?

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emerald cup videos on you tube.. and there is a video where he is talking in a small room on youtube also


here is a couple more studies. / history lesson lol


http://jxb.oxfordjournals.org/content/61/11/3107.full

http://jxb.oxfordjournals.org/content/53/376/1935

http://jxb.oxfordjournals.org/content/59/15/4171.full

MrEDuck said:

I think this is rather misleading. Plants do use green light in photosynthesis, but that has nothing to do with it being safe in the dark period. I have a friend who grew a crop with 24/0 blue light from an LED and 12/12 from a CMH and he had no problems. Only a small increase in yield compared to growing normally though. The hormone responsible for telling the plant if it is dark relies on red light to be activated. So while the blue and green light causes photosynthesis it doesn't disrupt phytochrome production and interrupt the flowering cycle.
I would be careful with green CFLs as they do produce some red light, just like a metal halide can look extremely blue but still has some reds in it's spectrum. To not interefere with flowering a light must produce no photons in the 630-660nm range. I can't remember the exact numbers for phytochrome but that should be quite close.

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phytochrome is 730nm outside the visible spectrum. 660nm does hasten the pfr when they wake up. all 730 does at lights out or sunset is it sends the plant into its phytochrome state faster within a few min. Without 730nm it takes 2 hours for a plant to enter the phytochrome state. ie the flowering stage during sleep. Green light, by enhancing or driving photosynthesis helps absorb photons from all other regions including red.


https://www.rollitup.org/led-other-lighting/722947-measuring-plant-lighting.html


[url]http://plantphys.info/plant_physiology/phytochrome.shtml


http://www.controlledenvironments.org/Light1994Conf/2_4_King/King text.htm


http://www.life.illinois.edu/govindjee/photosynBook.html
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Thanks for all of the links man. It was before I'd had coffee.
I still think if there's no red light present it wont matter based on what I've seen others do. I leave them dark because I don't have the money to buy an LED to experiment with
I've heard of using halogen bulbs tgat have the far red around lughts kn and off to run longer (13-14hr) photoperiods.
Pardon typos I'm on a phone.

MrEDuck said:

Thanks for all of the links man. It was before I'd had coffee.
I still think if there's no red light present it wont matter based on what I've seen others do. I leave them dark because I don't have the money to buy an LED to experiment with
I've heard of using halogen bulbs tgat have the far red around lughts kn and off to run longer (13-14hr) photoperiods.
Pardon typos I'm on a phone.

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Rrog uses halogens for pfr. If you look at the spectrum chart it has blue, green, yellow, red wave lengths. But more deep red and far red. There has to be far red 730 only at lights out. So I don't think the halogen would work. I run 3 inda gro inductions with led add on pontoons. They have 730 led's that run off a battery that charges while the lights are on. When the lights turn off. The 730 leds turn on. The battery they run off has 5 min charge. After 3 min. They dim down til they're off like a sunset.

Running with lights on longer hours depends on strain. I had mine at 12/12 for 12 days then got the IG's. Switched to 13/11 for 3 weeks. They did not like it. So I went back to 12/12. The buds doubled in size in a week. To their normal size. Next batch now they are on 20/4 then in a few days drop to 18/6 for a week. Then 14/11 for 4-5 days. Then drop 30 min every few days til 12/12. Last few days before harvest drop to 11.5/ 12.5