When an instrument runway lighting is designed the last 600 metres 2 000 ft or one half of the runway length available whichever is less are bi directional.
Airport runway lights voltage.
They are the high intensity runway lights hirl medium intensity runway lights mirl and the low intensity runway lights lirl.
The whole string is fed from a constant current source set to deliver up to 12 amps at up to 1500v 50hz ac rms depending on the brilliance required.
These light systems are classified according to the intensity or brightness they are capable of producing.
Then you loop the runway edges with a single cable to supply every light.
Runway edge lights are used to outline the edges of runways during periods of darkness or reduced visibility.
Airfield runway bulbs are used in airfield lighting fixtures for taxiway edge lights runway edge lights runway touchdown zone lights runway end identifier lights and runway signage and markers.
Since runways can be more than two miles long the advantage is.
The majority of runway edge lights are clear or white but there are some exceptions to provide additional information to pilots in certain circumstances.