LED Lumen Maintenance
At LIGMAN we design our own LED light engines to maintain the thermal equilibrium of our luminaires below the critical temperature range and we properly input the optimum driving current and operating conditions to state maximum luminous flux output together with the stated useful life performance of the LED luminaires.
We publish the rated values of L90/B10, L80/B10 and L80/B50 for our entire range of LED products, which indicates the lifetime expectancy of the LEDs used. As an example, a rated lifetime of L90/B10 to 60,000 hours means that the LEDs maintained lumen performance is over 90% after 60,000 hours. It also indicates that only 10% of LEDs will not achieve 90% of their original luminous flux after 60,000 hours.