Lamp Life is a measure of how long a fluorescent lamp operates and determined by that point in time when 50% of the lamps have failed. Lamp life is a function of emitter depletion – when you run out of emitter emission material the lamp will no longer operate. Some lamps will last longer than the rated life and some fail sooner.
Starting methods, switch cycles, the type of ballast used and other factors can significantly affect lamp life. In general, life ratings for fluorescent lamps range from 6,000 to 30,000 hours based on the industry standard of three burning hours per start.
LED is three plus years and range up to 100,000 hours.