All the fittings and retrofit lamps we sell have a quoted life expectancy. Like fluorescent, the light output from an LED will decline over time. The dedicated LED fittings we use and sell have superb longevity and reliability with an expected lifespan of 50,000 hours. If used for an average of 6 hours per day every day, this equates to nearly 23 years.
Retrofit LED lamps have a shorter life but again we use the best available, typically c.35,000 hours.
To read more about reliability and longevity in LED lighting see page 5 of The Lighting Buyer’s Technical Reference Guide