Karmaxul: Where did you get those figures? They don't jive with any of the research a few of us have been doing for a few LED grows that are starting up over the next year. We are looking at 640-660nm and 430-470nm this is essentially red and blue. There will be other wavelengths involved but that is about it for the visible spectrum. The central part of the (human) visible spectrum is the least sensitive to plants (green and yellow.) Mind you I know that not all plants are the same and some are more sensitive to other colors, but we are talking about cannabis.

I could be wrong but I don't think so. I have been researching this specifically for a few months now. If you can point me to some resource material that contradicts what I'm saying, please do.

amstron: unless you are using a light with a very "tight" nanometer range like an LED your light will bleed into other wavelengths. Incandescent bulbs are no good for plant night-lights.


FERMENT. Now, damnit.
FERMENTATION Reviewed by FERMENTATION on . green light could someone give me a scientific reason why green light effects plants during dark hours of flowering, as the plant cannot photosynthesise under this spectrum. This is just a matter of interest as the rule of thumb is no light during flowering, even green light. But if photosynthesis doesn't occur under green light then how can it effect the plant? :confused: Rating: 5