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Hi Sharon_hazan,

I'm not entirely sure what you are asking. Photosynthesis in plants occurs throughout the entire visual spectrum (and beyond) however photosynthesis is most efficient with light being delivered within certain spectrum bands. That said, for a visually appealing 'look' we need to generate some amount of all colors.
 

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Green LED's are generally a "waste" mostly because they have really poor diode efficiency........There are other ways to "get green" that are more err worthwhile..


The light you posted is more of a err.. "style" for people than anything "scientific"..
since photosynthesis can use any visible light calling it a "waste" is not really exact.. Calling it a "POOR CHOICE" is really a better characterization.
http://www.technology-hydro-culture.com/en/content/12-the-truth-about-wavelengths
 
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is a waste because the plant doesn't use the light
so why to waste power/space on the lamp fixure
Both.. Plants underutilize green and LED green diodes have poor conversion efficiency.. say 23% of electricity is converted to light w/ a green diode vs 45% electricity is converted to light in a blue diode.
but your eye is more sensitve to green (about the opposite of plants) so green helps things look "brighter" yet it its more of an illusion..



A bright green LED would look "dull" from a plants perspective. Opposite of the above photo which, w/ "plant eyes", would look extremely bright probably.. ;)
Just love this image..

BACK to the electrical thing..
The green gap has been challenging in a number of solid-state lighting (SSL) applications. For example, RGB (red, green, blue)-based approaches to delivering white light require more green LEDs than blue or red LEDs. Moreover, monochromatic applications such as green lighting in traffic signals require driving the green LEDs at higher current levels, or using more LEDs, relative to yellow or red signal lights. The green gap has also been an obstacle in LED displays or projectors and in backlight systems.
http://www.ledsmagazine.com/article...oject-increases-efficiency-in-green-leds.html
 
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