i had the opportunity to try out the new Specialized Flux Elite light last Friday night on my ride at Sumas on Squidline . not a bad unit , pricey but worth it in some ways due to it,s features .
it,s a self-contained unit so no battery or cables ,
it has a remount switch if one chooses
there is several options of light usage , different lumen ratings , strobe , choice of LEDS lite .
light can be flipped upside down if needed
quick-change mount .
for one ride and the conditions , cold and windy at the time i liked the unit , the brightness lasted the whole ride where those in the group with Magic Shines where below 50% battery life over the same time frame .
not sure i would pay $300ish for it but it is a unit to look into .
http://www.specialized.com/ca/en/ftb/lights/lights-ftb/flux-expert-headlight
speaking of battery life my helmet lite is a 4 cell Gemini Duo
http://gemini-lights.com/products/duo
i used it for my ride with the Specialized unit above , several hours the other nite doing trail work and a couple hrs last night when we had a power failure and the light quality was still strong for a lite that was in use for over 4 1/2hrs minimum .