Product claiming "20,000 hours average life, up to 11 years at 5 hours use per day"; However, mine started to burn out within 6 months. I have a timer and they work 6 hours a day. That's about 1000 hours of light before they die (6 hours/night x 30 days/month x 6 months). I loved lightbulbs until they burned out. Nice warm glow, perfect atmosphere, works great on my patio. But I can't leave a good review if they only give 1/20 of what was advertised.