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. Superior brightness and energy savings. Source Four PARs deliver a smooth, even field, and at 575W are comparable to 1000W PAR64s while saving 40% on energy. Plus, changing beam angles is easy Source Four PARs come with set of four snap-in lenses that mount in a cool, rotating ring. That also means no more reaching into a hot can with cracked porcelain sockets. And when need a new lamp, just use stock of Source Four HPLs (no need to carry a large inventory of expensive PAR64 lamps). Source Four PAR's compact design means more units can be mounted on a pipe or fit into a truck. Combined with reductions in power and cable requirements, Source Four PARs are perfect for touring.