if you are still using an incandescent Surefire, and not familiar with Solar Force (HK), they have module upgrades for around $12USD... I have a couple of the 320 lumen and one mongo 800 lumen... they don't have the heat sink of a Malkoff but are 1/5 the price... you can put together a pretty nice high intensity light for under $30.... a $12 module with one of their bodies like the $12 L2M shown , and $5 worth of CR123s....takes a couple of weeks to get here from Hong Kong...
