Is edge lighting spacing dependant on runway width (in order to maintain correct visual "perspective" on approach)? if so what is the formula for calculating this.. If not, what is the spacing exactly? Is it variable? I'm usually too busy (T.O/landing) to notice or try and work it out!! Can't seem to find it in any reference either. Any input appreciated.
The following is an exerpt from FAA AC 150/5340-30A
The runway edge lights are located on a line parallel to the runway centerline at least 2 ft (0.6 m), but not more than 10 ft (3 m), from the edge of the full strength pavement designated for runway use. On runways used by jet aircraft, we recommend 10 ft (3 m) to avoid possible damage by jet blasts. On runways not used by jet aircraft, we recommend 2 ft (0.6 m). The edge lights are uniformly spaced symmetrically about the runway centerline, such that a line between light units on opposite sides of the runway is perpendicular to the runway centerline. Longitudinal spacing between light units must not exceed 200 ft (61 m). Use threshold/runway end lights as the starting reference points for longitudinal spacing calculations during design.
Hope this helps.
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AirRabbit