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Stereotypes are stereotypes. Light does not equal good, and darkness does not equal evil. I would equate light with chaos and darkness with order. Because light is the emission of waves, usually quite chaotic (with the exception of lasers). Also, light heats bodies, and heat is also chaos, which is understandable. Then darkness turns out to be more orderly, like the absence of light.
That's why I chose darkness. Also because light carries some information, and darkness does not, so it contains a mystery, and mysteries are good because of the act of solving them. But my choice of darkness has absolutely nothing to do with evil or death: I am a cheerful person and try to be helpful to others whenever possible.