Tungsten Halogen Technology

LED Technology

Runway Lighting

Runway edge light are used to outline the edges of runways during periods of darkness or restricted visibility conditions.

There are several categories of runway edge light:

• High intensity runway lights (HIRL)
• Medium intensity runway lights (MIRL)
• Low intensity runway lights (LIRL)

Runway Edge Light Systems (HIRL/MIRL/LIRL): The runway edge lights are steady white lights on the edges of the runways. On instrument runways, the white lights change to yellow during last 2,000 feet, or half the runway length, whichever is less, and then they turn red as the aircraft reaches the end of the runway.  They can be high-intensity (HIRL), medium-intensity (MIRL) or low-intensity (LIRL).

Runway Centerline Lighting System (RCLS) – On some precision runways, a runway centerline light system is installed, with white lights spaced at 50-ft intervals on the centerline of the runway. With 3,000 feet remaining, the white lights change to alternating white and red, and then all red during last 1,000 feet.

Touchdown Zone Lights (TDZL) – Touchdown zone lights are steady white lights placed in two rows next to the centerline, starting at 100 feet and extending to the midpoint of the runway, or 3,000 feet beyond the threshold, whichever is less.