Originally Posted by hopperja

Based on the few opinions I could find here, I deceided to order two (one for myself, another to give as a gift) of the Ultrafire lights. I liked the idea that it can run on one AA, as an added bonus. I already have a Fenix L2D Premium Q5.

While I like the Ultrafire, it'll mostly be used as a backup. It isn't nearly as bright as the Fenix. When I compare both, outside, with fresh batteries, in the dark, the Fenix turbo (180 lumens) and high (107 lumens) modes are definitely brighter than the Ultrafire. The Fenix medium mode (53 lumens) is not as bright as the Ultrafire on high. I would rough guess the Ultrafire to be around 90 lumens on high (this may not seem like very much, but this is roughly 2x the lumens of a 2xAA MAG LED), so it's bright enough to ride with in a emergency.

Is it worth it? I'd say yes. However, keep in mind: 1- it's not nearly as bright as the Fenix, so for regular night riding the Ultrafire isn't a replacement for a Fenix; 2- I ordered two Ultrafires, and each of them would not fit AA batteries - the body was too tight. I had to carefully sand both of them out using a Dremel tool in order to fit the AA batteries.