Re: LED flashlight problems - flickering and quitting
You'll find the problem in pretty much any flashlight -- the contacts corrode. In many of the aluminum flashlights with a screw-off cap on the bottom end, the connection between the cap and the body is the most likely culprit. Cleaning the mating surfaces between the cap and body (not necessarily the threads, but where the shoulder on the cap meets the butt of the flashlight body) fixes the issue.
It tends to be more of a problem with LED flashlights because the electronics require some minimum voltage to maintain service. As corrosion increases, so does electrical resistance. With increased resistance you see a voltage drop. Add that voltage drop to the voltage drop of weak batteries and at some point it's not high enough to sustain the LED. Where an LED just quits, an incandescent flashlight gets dimmer.
I've heard good reviews of Streamlight (very expensive) and LED Lenser (sort of expensive) flashlights. MagLite is OK, but very prone to the cap corrosion issue.
If it has more than one LED, don't even bother buying it. That's the sign of a manufacturer that's too cheap to use decent parts.
Last edited by Fencepost; 11-25-2013 at 01:47 PM.
The "Senior Member" designation under my name doesn't mean I know a lot, it just means I talk a lot.I've been a DIYer since I was 12 (thanks, Dad!). I have read several books on various home improvement topics. I do not have any current code books I can refer to. I was an apprentice plumber for two years.