These are some of my favourite lights:
1. 3W 2AA - has a runtime of 80 minutes with relatively constant brightness!
2. Phaser, of course.
3. 3*3W - TWOJ - has the same light output as the Tri-star 4D, with only 3D!! /ubbthreads/images/graemlins/thumbsup.gif
4. Just a 3*1W, nothing special.
5. Tri-star 4D