The lifespan depends on how much you run it. Used exclusively during holiday seasons: 30–40 years. Used year-round at typical evening hours (sunset to bedtime): about 20–30 years. Run continuously 12–16 hours per day (except during severe summer heat): 7–8 years. Run 24/7: significantly shorter — heat dissipation matters. For most Middle Tennessee customers, the actual usage works out to about 4–6 hours per night, every night, including warm-white year-round plus holiday scenes — putting most installs in the 15–25 year actual-lifespan range. The bulbs themselves are rated for 50,000 hours of light use.