I know this is old news to most of you but since I'm now using (2)CR2016 batteries (instead of my normal (1)CR2032) in my turquoise Photon Freedom Microlight I decided to find out how to activate the 50% power usage mode in order to conserve battery life. The most surprising thing I noticed is that the difference in output vs. the 100% power mode is barely noticeable. From now on I think I'll be using the 50% power mode most of the time. Plus, it could come in real handy if I need to run one of the strobe modes for an extended period. Here's a great instruction "how to" from the Photonlight forums.

http://forum.photonlight.com/50-power-mode-for-even-more-battery-life-vt1158.html