I'm not a fan of the USB lights for 'to see by' duty. They cost too much, several accounts of poor mounting designs, batteries either can't be swapped out "in the field" or have an expen$ive properitary design.

I'm currently running a sub $18 flashlight rated at 510 lumens, a $2.20 bar mount that is surprisingly effective, a pair of $7.99 protected 18650 cells (all from DX), along with a wall charger from shiningbeam.

Haven't had a chance to battle test it as a 'see by' light yet as I leave the house around 0730 for an 0800 clock in, but I have noticed using it as 'see me' light is doing its job.