LED lights have a lifespan of 25,000 hours - 10 times longer than incandescent bulbs! Unlike incandescent bulbs, an LED's lifespan is not determined on when it is expected to blow. LEDs should never blow, instead fade slowly over time. The Lifespan of an LED is determined by when the LED will reach 70% of its initial brightness - which is 25,000 hours. However, this 70% of initial light output still offers plenty of light and many people will be happy to use LEDs for as long as 50,000 hours. An easier way to look at it, if you use your bulbs for 4 hours per day, it will be over 17 years later until the bulbs have reached their 25,000 hour 70% output level and you may want to consider changing.