)... Plants look green because that's the light they reflect, the stuff they use is shorter and longer wavelengths than green (wavelength determines the color of light). If your windows are blocking 100% of the UV, your plants should still be able to function from other wavelengths of light, but might not thrive quite as well. That's the difference between growing plants under standard bulbs versus grow lights - many people do just fine with the former, but you get the best results from the latter, because they have a broader spectrum, usually including some UV (though it varies with the type of bulb). To complicate things further, plants use light differently at different stages of life - they'll benefit more from light on the blue end as seedlings and in vegetative growth, and toward the red end in flower or fruit production. There are also differences between plants - as Ken mentioned, many tropicals that we grow as houseplants come from the understory, where they'd see green light filtered through the trees above. Although chlorophyll doesn't absorb green light, plants have other pigments that can, and the ratio of different pigments varies between plants, between leaves on the same plant, and throughout the plant's life.
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