XLamp COB CMU Family LEDs Cree XLamp COB CMU Family LEDs offer high performance with up to 10% higher LPW than the previous generation CMT family. They retain mechanical and optical compatibility with CMT XLamp CMU LEDs. The LEDs are ideal for premium indoor lighting applications, including downlights, track and spot lighting, as well as outdoor lighting. The family's performance advantages include higher maximum current, higher minimum flux values and higher typical efficacy.