Optimisation of LED luminaires renewal interval based on proposed CLO adjustment method

A considerable part of electrical power is consumed in lighting systems. Electrical power usage and, as a result, generation is proportional to CO₂ emissions. CO₂ emissions result in climate change. Many countries encouraged people to use modern light sources, including LEDs, to increase the efficiency of lighting systems. An LED, during its long life, is subjected to gradual degradation. Its degradation can be understood from its radiant flux decrement. Some standards, including LM 80-08, addressed this issue. Constant lumen output (CLO) drivers are used to deal with LED degradation issues. There is not much scientific research on the topic of CLO. This paper suggests a scientific approach to finding CLO's exact output voltage as a function of time during the LED lifetime, limiting energy consumption to the required value. Also, a method for finding the best time to replace LED luminaires to minimise the financial burden for the owners has been found. By optimising renewal time for LED luminaires, energy usage (CO₂ emission) and end-of-life waste will be managed to the required value. In addition, for use in CLOs, the paper suggests adding more specified data to the LM 80-08 report.