Long lifetime stands out as the number one benefit of LED lights. LED bulbs and diodes have an outstanding operational lifetime expectation of up to 11 years of continuous operation, or 22 years at 50% operation. If you leave a LED fixture on for 8 hours per day it would take around 20 years before you’d have to replace the LED bulb. Lighting diodes emit lower output levels over a very long period of time and become less bright, while LEDs maintain their original brightness throughout their lifespan.