ETC 419 Source Four 19-Degree Ellipsoidal | Color: White, Connector: Edison (Parallel-blade U-ground)ETC's 419 Source Four 19 Degree Ellipsoidal combines the energy saving power of the patented HPL lamp, with a dichroic reflector and optical quality lenses. That means your gels, patterns and shutters last longer and your performance space stays cooler. No other light offers such optical brilliance. Source Four's revolutionary technology gives you a clean white beam for unequaled imaging, crisp pattern projection, and a bright, even field. The EDLT