Enhanced Definition Lens Tube is used when your lighting situation requires even more precise optics for projecting images, gobos, and logos, the Source Four® EDLT (Enhanced Definition Lens Tube) option is an invaluable addition to your Source Four inventory. The EDLT attaches easily to any new or existing fixed-focus Source Four ellipsoidal spotlight. While increasing light output up to 10%, EDLT also provides heightened sharpness and stunning contrast to images when the Source Four is used as a pattern projector. With the innovative EDLT option on your Source Four, the best spotlight available gets even better.