Get a Lumapower D-mini VX Ultra from Battery Junction for $100. (plus 5% off with discount) About 3.8 inches long with the 16340 IMR tube, and 550 lumens from an SST-50 run at 2.1 amps. Really nice hot spot for an SST-50. Throw is about 8000 lux. People are amazed at how much light that tiny little thing can put out. Comes with an 18650 tube also. You can run a Flat-top AW battery in it. Still a small light with an 18650. When you get into modding it is nice because the pill is easily changed or modded. Mine has a 2.8 amp driver and is over 700 lumens and making 12,000 lux. Turbo head due out next week. Will be over 30,000 lux I'm sure (factory stock light).