The ETC Source Four is the industry-standard ellipsoidal reflector spotlight, and the 750-watt tungsten-halogen version represents a classic workhorse for theatrical, studio, and live event lighting. Renowned for its superior optical performance and versatility, this fixture produces a sharp, focusable beam of light ideal for highlighting actors, scenery, or specific areas on stage. Its defining feature is the patented elliptical reflector and precision lens tube system, which creates an efficient, high-output beam with exceptional field flatness and minimal hot spots, setting it apart from older spotlight designs.

The fixture's functionality is highly flexible. By inserting metal "gobos" into its gate, it can project patterns and textures, while its four framing shutters allow the beam to be shaped into hard-edged rectangles or other geometries. Interchangeable lens tubes (with different field angles like 19°, 26°, 36°, and 50°) let users choose the ideal beam spread for each application. While the 750W lamp provides intense brightness, it also generates significant heat, requiring proper ventilation and adherence to lamp replacement cycles to maintain performance and safety.

Constructed from durable aluminum with a distinctive gunmetal gray finish, the Source Four is built for long-term reliability in demanding production environments. Its modular design supports easy maintenance and upgrades, including conversion to LED technology using retrofit kits like the ETC Source FourWRD. As a foundational tool in stage lighting, the 750W Source Four Leko delivers the control, output, and quality that lighting designers rely on to create precise, dramatic visual compositions.