I use Sunmaster Dual Spectrum 600 w T15, i have used it for 6 grows or so and each crop is getting less and less now, the box says 24'000 hours life, thats near 3 years on 24 -7. What Do You Think ?
Def replace it. HID lights...there biggest issue other then heat is after a couple grows it dramatically outputs less. The box is most likely refering to total time.