Does the color of light affect plant growth?

Yes, it does. The chlorophyll contained in the chloroplasts of plant cells absorb light at two wavelength regions, in fact in terrestrial plants there are two types of chlorophyll namely a and b. They both have a bimodal absorption spectra (see reference below) where they absorb light strongly, but then also have a region of wavelengths where they are inefficient at the process. So, the color of light within the photosynthetically active radiation region (visible light that supports photosynthesis) is very important and has a direct impact upon plant photosynthesis and therefore growth. happy mylot day.