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Red plants under red light

Here's my guess:

However the question is then : Does light without green slow down photosynthesis ?

Since the green wavelength is reflected from green plants, it means that it is not absorbed and therefore not used by the plants.
Hence, the plants could care less if you omitt the green spectra.
White = reflects virtually all light.
Black = absorbs virtually all light.

It is my understanding that the reason for us seeing colours, is that certain spectras are not absorbed but rather reflected instead.
A red car is read because the red lightspectra is not absorbed by the paint. It is reflected and you percieve the color to be red, due to the lack of other light spectra reflected from the car.

/Greger - Not in T-shirt any more. It's getting colder in Sweden now.