VestureOfBlood posted an amazing video in this thread about the the Acebeam W30.
- White laser
- Pencil thin beam rated at 1.5 million candela
- Small size, single cell, etc. all meet your spec.
Possible downside: little or no spill makes this a special purpose tool. One poster suggested that it may be ideal for certain boating and marine applications, such as spotting marker buoys at distance without generating huge reflections off the surface of the water.