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Runway edge lights are white, transitioning to amber near the departure end of the runway. The ends, or thresholds, of the runways have green lights at the âbeginningâ of the runway, or approach end. The departure end is marked by red lights delineating the end of operational pavement.
The addition of the primary colors of light can be demonstrated using a light box. The light box illuminates a screen with the three primary colors - red (R), green (G) and blue (B). The lights are often the shape of circles.