How do windows and natural light affect wall paint color choices?

Windows and natural light drastically influence how wall paint colors appear inside. Rooms with large north-facing windows receiving cooler light may benefit from warm or vibrant paint hues to counteract dimness. South-facing rooms get warmer natural light, making deeper colors like navy appear rich and inviting. Bright rooms allow bold, saturated paints without feeling heavy. Always test paint samples near windows at different times of day before committing.