How long do CFL grow lights last?
Every model has a rated life that’s usually expressed in hours. However, it’s not uncommon for poor quality bulbs to start flickering over time or stop working long before it’s expired. Ideally, however, 10,000 hours in operation (the usual rating) means the bulbs will last over a year with a 24h/day schedule and about two if you use the 12/12 regimen.