I have an addiction (obsession?) to flashlights, from oil lamps to LED flashlights. Most don't last through the horrible conditions I put them through, but a few are worthy of mention, as they survived so far.
I have a small Tektite
Trek 4 4-LED flashlight that isn't incredibly bright, but is very reliable and batteries last forever in it. I've had the thing for a decade and changed the batteries once. I use it all the time, and it's been on every night hike and camping trip. I also have a Tektite Trek 7, which is the 7-LED version of a Navy SEAL flashlight. I got this flashlight with green LEDs for some reason I don't remember, so I don't use it much. It has also developed an interesting problem over the years, where it never fully shuts off, rather it stays on with a barely perceptible beam that's only visible when the the room is completely dark, or if you stare straight down into the LEDs. Still, I've had the thing as long as the 4-LED flashlight, and have never changed its batteries.
My latest acquisition is a Petzl
Taktikka 4-LED headlamp with the red flip-down filter. I got it for night hikes, but it's already paid for itself by helping me around the house. I also have a Petzl E+Lite that's proven itself multiple times.
I also have a Photon Light on my keyring, but after so many years it's crying for retirement; the button to turn it on and off doesn't always work right so it's inconvenient, but it works if I fiddle with it.
My latest obsession with flashlights began when I stumbled upon the SureFire
website. Apparently, the company was started by an engineer to build industrial lasers and later turned into a company that makes lighting for guns and other tactical uses. Whatever of that story is pomp and hype, the flashlights look amazing. They're also amazingly expensive, leading me to believe that I'm going to be eating a lot of rice this year so I can save up for one of these.