a 10 day 24hour veg and 70 day 12/12 bud =1080 hours and the bulbs for sure are peak to around 12000 hours, so divide that by 1080 and you get 11.11 cycles, so maybe people veg longer, there still good for 10 cycle's minimum.
beleive me im not cheap, but i also aint given money away for the hell of it.
Hortilux says 24000 hours so half is fair.

Spleefman knows his shit, I'd def. check out Ushio bulbs based on his recommendation.

I was searching for bulbs, and ended up with the Osram Plantastar. First bulb to be designed from the beginning specifically for horticulture (hortilux wasn't originally made for horticulture, someone just noticed they worked good for it). Check them out, they have a great spectrum. I've used both, and prefer the Plantastars. Osram and Sylvania are sister companies, FYI.

Hope that helps!

Check out the hortilux blue, its the only bulb that is close to the same spectrum as the sun.