These bulbs work for 7 days, 12 hours a day off a large 120v genny, a year. That's it and yes, I could say that half die at the end of this. I'm sure the genny has been 120v every year. I've been googling the heck out of this 220v vs 120v bulb/power thing. I'm still not sure I get it since there is debate out there.