RLSI Runway Lights Setting Interface
RLSI is an electronic device designed to interface airport runway light system and to provide the RVR system with the current intensities of runway central and/or edge lights to be used for the computation of the RVR value based on the runway lights using Allard's law

The RLSI provides 12 inputs, which can be interpreted by software (for example 2 runways / 6 intensity levels).
runway lights setting interface

RLSI - Product sheet