Engineered with a cool beam for your performance environment. All the power of a PAR plus the cool beam of the Source Four®! This is no ordinary par can. Source Four PARs™ go beyond run-of-the-mill pars with ETC’s rugged, die-cast aluminum construction and acclaimed Source Four lighting technology. MCM stands for Metal Cold Mirror. This unique reflector coating ensures that only light, not heat, goes out of the front of the fixture – making the Source Four PAR MCM ideal for orchestra lighting or other performance situations where on-stage comfort is paramount.