Replacement Bulbs

Does anyone know if you can replace a 10w halogen with a brighter LED bulb. I have a Vistalight Nightstick setup and would like to make it brighter. The bulb can be replaced with a 15w halogen, but I'd like to go with an LED replacement for a longer burn time when riding. I know of replacement bulbs for regular flashlights, going form halogen to LED, and wondered if anyone knows of one for my light. Thanks!