The ETC Source Four 26 Degree Lens Tube is a precision optical assembly designed for use with all standard Source Four ellipsoidal spotlights, including the LED and HID versions. It provides a medium-narrow beam of light, ideal for accent lighting, medium-to-long throws, and detailed gobo projection in theatrical, corporate, and event environments. The lens tube helps deliver a clean white beam, crisp pattern projection, and a bright, even field.

The lens tube works in conjunction with the main fixture body's patented dichroic reflector to remove over 90% of infrared heat from the beam. This innovative design means that color gels, patterns (gobos), and internal shutters last longer, and the overall performance space remains cooler. The 26-degree lens provides a tighter light pattern compared to wider angles (like 36° or 50°), making it suitable for situations where a controlled, well-defined pool of light is required from a greater distance. The Enhanced Definition Lens Tube (EDLT) option offers even higher contrast and up to 10% more light output for ultra-crisp image quality. The tube itself is constructed from durable, die-cast aluminum and features an integrated focus knob for easy adjustment.