Which factor can cause color shade mismatch during refinishing?

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Color shade perception changes with the light that illuminates the paint. Different light sources have different colors and intensities, so the same shop or spray-booth color can look lighter, darker, or hue-shifted under daylight, fluorescent, or incandescent lighting. This effect, metamerism, means a color match in one lighting condition may not look the same in another, leading to shade differences on the vehicle. To avoid this, evaluate and finalize color under lighting that matches how the car will be viewed—often daylight-balanced or standard booth lighting. Temperature, humidity, and wind speed can affect curing and finish quality, but they don’t directly cause shade changes like lighting does.