ETC has combined the best of their acclaimed Source Four HPL lamp technology with the unique optics of a traditional Fresnel. (And that means you can further streamline your fixture lamp inventory with a single source – the HPL.) ETC’s Fresnel gives you the high-performance light output and energy savings of a Source Four and the lighting characteristics that only a Fresnel optical system can provide. They have combined that classic system with a special ETC dichroic reflector design, enabling the HPL 750W Source Four Fresnel to equal the light output of 1000W Fresnel fixtures.