Originally Posted by
ItsJustMe
If your LED lights get dimmer when it's cold, there's something wrong with them. They're supposed to be current regulated, and LEDs actually get a bit brighter when they're colder. The batteries do last less long. LiIon is the least affected, I see about a 25% dropoff between 70*F and 0*F.
I've got a couple of craptastic Ultrafire 501b lights that aren't regulated and they fade with time when it's warm and moreso when it's cold. They're backup lights now so it doesn't matter much to me, but I remember that feeling I got after the first couple of rides after daylight savings time ended and it was colder out when everything seemed to be harder. The colder temperatures made it harder for me to pedal through the darkness while the NiMh batteries ran down sooner - I felt like a kid thinking "it's not fair" when I remember how much easier things had been when it was warmer and brighter out the month(s) before. But then I HTFU, bought more/better lights and now I've got one less thing to complain about. At least for the time being.
