OT: I'm curious about a long lasting bulb I have. Nothing like any of those, of course...it is just that it has way more hours on it than I'd expect based on av

OT: I'm curious about a long lasting bulb I have. Nothing like any of those, of course...it is just that it has way more hours on it than I'd expect based on average lifetimes of various types of bulb. It's an outdoor security light over my garage. I don't know what technology it uses because the bulb is screwed in too tight for me to unscrew it with one of those things you put on the end of a pole to change out of reach bulbs, and I'm not agile enough on a ladder to be willing to get up on the garage roof to do it by hand. The bulb is clear so it is not fluorescent. I think it is some kind of gas discharge lamp. When it turns on it takes a minute or so to reach full brightness. It's been there since I bought this house 16 years ago. It's on a sensor that turns it on sometime during twilight and turns it off sometime during dawn. So figure maybe 10 hours a night average. That's over 58000 hours of on time. But 58000 hours is over twice the average lifetime of all the likely technologies for this kind of security light except LED and it is definitely not LED. So I'm curious what technology my bulb actually uses.