The federal Aviation Administration awarded Patriot Taxiway industries a contract for feasibility, development and procurement of Light Emitting Diode (LED) replacement lamps with or without infrared (IR) emitters for the Medium Intensity Approach Lighting System and Runway Alignment Indicator Lights (MALSR). The replacement lamps are for the green threshold lamps (PAR-56) and white steady burning lamps (PAR-38).

The primary function of a MALSR is to provide visual guidance to aircraft during approach for landing.