All NuOptic illuminators use high reliability surface mount LEDs with FIT (Failures In Time) performance rates that far outperform nearly all other light source types. Additionally, NuOptic uses extended temperature range versions of critical electrical components for maximum reliability and all NuOptic illuminators have a full 5 year warranty. Even under maximum operating temperatures and operating hours per day, laboratory tests demonstrate that a very low percentage of the units we sell will have a LED failure over this warranty period. The exact life depends on multiple factors, the most critical of which is how well the product is designed to carry heat away from the LED. The basic principle is as follows: the cooler the LED is, the longer the LED’s life cycle and the brighter it is. Running the illuminator at lower brightness settings or in a pulsed mode will significantly lengthen the useful life.