Low intensity lighting is a simple lighting system employed on airfields where the minimum lighting specification is required. Generally, the lighting patterns are the same as the high intensity systems but the candela output of the fixtures is much less.
Omni-directional Runway Edge Lights are positioned along or just beyond the edges of the runway and are white subject to certain specific exceptions.
Runway Threshold Lights are provided in a line along the landing threshold at the approach end of the runway. They are green and are only visible when on approach. These can either be elevated, or inset fixtures.
Runway End Lights are installed in a line along the end of the runway available in use. They are red and can only be seen in the direction of runway use. These can either be elevated, or inset fittings
Runway threshold/end lights are a combination of the threshold and runway end lights in a single body. They are green in one direction, and red in the other direction.
All the fixtures for this system are usually powered by 6.6amp circuit supplied by a constant current regulator. A simple control system can be used to operate the lighting, but it is common that this is linked to a ARCAL system so that a pilot can activate the lighting when on approach or departing.