I'm pretty sure they said 100,000 hours but claim 10 years for the useful life.
My ramp up is to increase the blues by 10% every 5 minutes and the whites by 5% every 5 minutes till both are at 100%. At that point I have 400w MH
equivalent lighting. They stay at 100% for 8 hours, then ramp back down to 10% moonlight (full moon) or less. There's actually a wink out period just before the dawn and just after the dusk timings kick in.