Not sure, haven't even tried them yet, still renovating the house, three years and counting. But according to the specs:

    L70 ≥50,000 hours at 25°C ambient

L70 is "An LED is considered to have reached its rated life at that point in time when it emits 30% less light than it initially did. This 70% brightness level is termed “L70” and may also be referred to as Lumen Maintenance." (https://nunvdata.unvlt.com/uploads/Understanding_L70_and_Why...)