We found the Princeton Tec Clip Point Light very handy to clip it to a hat band or pocket and the gooseneck makes for a easy-to-point beam to keep your hands free for whatever task.
The mount is arranged so the clip can point forward or back. Turn it around and it is just the thing for clipping on the bill of your baseball hat. I’ve even used it clipped to my bicycle helmet straps–for close work, not really bright enough for the street.
PT also makes a military version (Switch – MPLS) with dual lights (red/white) and a helmet mount. A large button at the side turns on the light with 10 Lumens of light. A second push provides a high beam with twice the light.
Available with White, Red, IR, Green, or Blue LED. Batteries: two 2016 Lithium Coin Cells (included). Weighs 17 grams.