Tlacs Tunnel Lighting Addressable Control System
User Manual V1.3 . 1 109 Saint-Vallier Est, suite 100 . Qu bec, QC, G1K 3N9, Canada ... and an ON threshold of 1000, the lumens measured by the luminance photometer must cross the 1000 limit to switch to the higher LSR. However, to turn it OFF, the luminance value must be lower than 900.