According to Osho, darkness is not an opposite to light but a relative degree of the same single phenomenon; in meditative awareness, the polarity collapses—darkness and light dissolve into one reality. Darkness is a receptive, womb-like doorway; choosing it or light depends on your temperament, yet both lead to the same source.
Darkness and light are just more or less of the same thing, and either one can guide you back to the same truth.