The black KX9 LED Conversion Head from SureFire is designed to convert compatible flashlights and WeaponLights from incandescent illumination to a single-output 500 lumen LED. The Total Internal Reflection (TIR) lens produces a pre-focused beam that has a tight center cone of bright light, with a dimmer ring on the periphery to maintain situational awareness. The KX9 can be used on certain 9-volt LED WeaponLights to increase the output and reach of the light. Additionally, it will convert dual-spectrum M500V and M900V LED WeaponLights into higher-output, white-light-only systems with increased reach.

The machined aluminum alloy body is protected by a hard-coat Mil-Spec anodized black finish. O-rings and gaskets seal the case against water. The tempered lens window has anti-reflective coatings for increased light transmission.