After 4 years 3 months, the lamp in this fixture stopped working yesterday. It was rated for 15,000 hours so about right on. Not bad for a no-name bulb, I must say! It's been working faithfully every night since it was installed over 4 years ago.
Yeah, assuming 8hrs per night, that's 12410 hours, which is in the ballpark. I wish mogul base low wattage MH lamps were more common. They're uncommon in general and very rare to see from major manufacturers. Dave Silverliner has at least one 50W CMH Sylvania mogul base lamp. A real modern-day gem!