ETC Source Four LED Series 2 Lustr EllipsoidalSource Four LED Series 2 Lustr luminaires are based on the x7 Color System, utilizing seven colors including high output lime to achieve true, usable broad spectrum color with a depth and feel beyond any RGB fixture. We put a twist of lime in the luminaire and mixed it all up. ETC's x7 Color System combines a balanced recipe of up to seven colors to create evocative color mixes. The Source Four LED Series 2 Lustr array takes the idea even further,