Bought several pairs. My only complaint is that the bulbs last less than a year. What is 20,000 hours for a fluorescent lamp? 365 days x 24 hours a day (I leave them on 24 hours a day) = 8760 hours. They don't last 20,000 hours. Maybe it's because of my special equipment. I do not know . Be careful, they can last less than a year.