Source Four Tungsten Ellipsoidal Luminaire 90° BlackThe fixture that changed the lighting industry. Source Four combines the energy saving power of the patented HPL lamp, with a dichroic reflector and optical quality lenses, for the coolest beam on the market. That means your gels, patterns and shutters last longer and your performance space stays cooler. No other light offers such optical brilliance. Source Four revolutionary technology gives you a clean white beam for unequaled imaging, crisp pattern