What typical measure is taken to ensure the visibility of approach lights?

Using reflective materials to ensure the visibility of approach lights is a standard practice because it enhances the light's visibility against various backgrounds and in different weather conditions. Reflective materials can effectively redirect light and improve contrast, making it easier for pilots to identify these lights from a distance, particularly during dusk, dawn, or adverse weather conditions. This approach ensures that the lights stand out sufficiently against the surrounding environment, which is critical for safe navigation and landing procedures.

While adjusting brightness might play a role in visibility, it does not enhance physical recognition as effectively as reflective surfaces. Positioning the lights at higher altitudes could potentially improve visibility but may not necessarily address the issues of environmental contrast. Color-coding can assist in the recognition of different lights, but reflection fundamentally enhances the illumination and makes them more distinguishable from afar, which is crucial for their primary function.