User blog comment:Anakin Skyobiliviator/Yellow/@comment-3361105-20110823213322

Light from the sun is actually white. In the same way that white-light passing through a prism turns into a rainbow, light passing through the earth's atmosphere at different angles causes the sky to be different colours (different angles of entry equal different wavelengths of radiation = different colour). The real contradiction is in why Superman loses his powers under a red sun, and not a yellow sun. Though, there are slight differences in composition between red and yellow suns (more or less helium, I believe). But it's important to note that Superman is affected by radiation from the two kinds of sun, whereas Green Lanterns are affected simply by the colour yellow. I think the explanation is that it's not the colour but the emotional force behind the colour that causes the impurity. Willpower is never strong when it is corrupted by fear. Not to mention that Green Lantern doesn't often fight... the sun.