Illuminance Degradation of LED Streetlighting Luminaires in a Hot Environment

摘要

Two LED streetlighting luminaires were installed in the citynof Al-Ain, United Arab Emirates, one of the hottest regions in the world.nThe street was closed to traffic and illuminance measurements werentaken daily every 10 minutes for 300 days including the summer ofn2010. Temperature and relative humidity values were acquired insidenthe driver compartment of the luminaires and outside of the luminaires.nThis paper reports the illuminance levels, temperature, and relativenhumidity data. Illuminance did not change by more than 12 percentnthroughout the test period. The drop in illuminance was 4.5 percent pern10 degree C for the ambient temperature range of 20–40 degrees