Mk5 to use in my latest Everest attempt, the light had around a 45% discount and cost roughly £180.
Although not a cheap light they have a fantastic build quality and seemed an ideal tool to Everest with:
- Long battery life, anything from 2 to 36 hours depending on setting (you can get a good 12 hours of very bright lighting)
- The light also benefits from 'smart port technology' which allows it to be used as a back up power supply. This comes in very handy when combined with a Boost Cable as you can recharge your Garmin during a long ride.
I would highly recommend double checking that your charging system works before setting out to do your Everesting, no one wants to loose a ride after 17 hours in the saddle.