I bought these lights for my sheet metal shop. Lights are rated for 60,000 hours of use. I bought them in late October early November of 2017. Some burnt out real early. I have five lights out with less than 6000 hours on them. I had bought one and liked how bright the area was (20 ft. ceilings) so I bought like ten of these lights. I do not think these lights are as good as I thought they were. I am going to try another light. I also did not attempt to return them. Two lights went out in like a year. So lets say 365 days x 8 hours a day = 2920 hours. I was open more like 2000 hours a year.