Officially, Source Four is the name of a family of products from Electronic Theater Controls (ETC). Included in this family are the Source Four Par, Source Four Parnel, Source Four Revolution, Source Four Jr., and the Source Four. In common use, Source Four refers to just ETC's ground breaking Ellipsoidal Reflector Spotlight. Released in 1992, it redefined the ERS and has become the industry standard. They are so widely used that some people now refer to all ERS instruments as "Source Fours". Over two million units have been sold since 1992.
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