Light isn't always a symbol of good; in The stairs of Cirit Ungol chapter, TTT, Minas Morgul has an "unholy" light about it:
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Paler indeed than the moon ailing in some slow eclipse was the light of it now, wavering and blowing like a noisome exhalation of decay, a corpse-light, a light that illuminated nothing
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We also have the white hand of Saruman, and, on the other hand, the black stone of Erech. As you see, nothing is black and white about good and evil