http://www.knucklelights.com/) to illuminate my way along the many road sections with limited street light illumination, and to be more visible to the frequently distracted drivers sharing the road. In both regards the Knuckle Lights were very helpful. I was particularly happy to see oncoming cars swerve well aside long in advance to provide me ample running room. I also found the diffuse illumination from the two lights (a Knuckle Light is held in each hand) provides better all-around visibility than my Petzl headlamp - which I particularly don't like wearing when it is hot.
Each KnuckleLight weighs between 6 to 8 Oz. (including batteries), which feels light to me. An adjustable strap allows a loose (my preference) to tight fit on the hand. The best indication of the unit's good design was after a few minutes I didn't notice them.