Answer :
Final answer:
Runway edge lights are generally white, but change to yellow within 600m to the runway's end to signal to pilots their distance from the end.
Explanation:
The color for runway edge lights in normal circumstances is white lights. However, when you get within 600m to the end of the Runway (RWY), the lighting changes to yellow lights. This helps the pilot determine their distance from the end of the runway. This is reflective of option a) White lights, and within 600m to the end of the RWY, yellow lights. Using colors like yellow, which, as per the provided data has a wavelength of about 600 nm, helps in distinguishing these lights against the nighttime sky and signals pilots effectively about the nearing runway end.
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