A typical LED bulb can last for up to 80,000 hours; compare that to just 2,000 hours in a conventional halogen lamp. So before one LED lamp burns out, you would have replaced a minimum of 20 halogen lamps in the same length of time. What do other kinds of light bulb you know of that can last up to 18 years?
LED lighting has a lifespan of 50,000 hours, as opposed to the 10,000 credited to CFLs under ideal circumstances. CFLs often fail to live up to their claims and the early failure rate is quite high. Another reason the LEDs have such a long life-span is that by their nature they are less fragile than CFLs or incandescent bulbs. Being a solid-state bulb there are fewer breakable parts, so while CFLs are very vulnerable to accidental breakage, LEDs are far more robust.