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How well would a plant grow under pure yellow light?

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Ray Dart Profile
Ray Dart answered

Very badly, generally speaking. Tests at a plant research institute in Hampshire in the 1960s showed that plants grown out-of-season in greenhouses under sodium light grew barely any faster than similar plants without any sort of artificial light. Plant grown under mercury light, grew very much better. I'm not an expert in the field, but I think it is believed to related to the amount of ultra-violet in mercury lights.

Karl Sagan Profile
Karl Sagan answered

First of all, any plants need ultraviolet light. Answer your own question. Is there enough ultraviolet light in the spectrum of pure yellow light? I don't think so. Besides, this spectrum will not give enough heat to plants. I think you should consider buying special grow lights. Thanks to this lighting, your plants will grow as if in a natural environment.

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