We are pleased to announce the new SIM-LED assembly designed for the popular Streamlight/Insight M Series Weaponlights. With the SIM-LED the output is upgraded to almost triple that of the original CFL-700 incandescent lamp. It also allows user to use 3.7V rechargeable batteries as well as the primary CR123a to power the light. Owners can now upgrade their M Series Weaponlights to be on par with modern LED pistol lights with this simple upgrade!