Fenix Bike Light Sponsorship

FarEast

Maximum Pace
May 25, 2009
5,528
538
193
Yokohama
#4
Kimura - Very interested in testing this light also. Especailly in the winter months when I start my off season training and lights become essential.
 

joewein

Maximum Pace
Oct 25, 2011
2,424
862
133
Setagaya, Tokyo
joewein.net
#12
A dynamo hub version would be nice. I think for randonneuring events, a dynamo powered light would always be my first choice.

18650 cells (cylindrical Li-ion cells of 18 mm diameter and 65-68 mm length) are much more capable than AA (#3) or CR2032 (button) cells used in many cheap bike lights. Given this superior power source this light should work well, but with really bright lights these cells also reach their limits.

Fenix uses 2600 mAh cells. A dynamo supplies about 500 mA at voltages similar to two 18650 cells in series, so if the light maxes out the dynamo the same setup with 18650 batteries would last about 5 hours. If you need to cover more hours you would carry spare cells.

I wonder when somebody will come up with a bike light with builtin USB port, so it can double up as a smartphone charger during daytime rides :)