CSL Shallow Plenum downlight systems provide quality built New Construction housings for plenum spaces as low as 2 ½". At the center of every product is a high-performance LED module engineered with enough power and lumens to fill the entire room with quality light, down to the floor through CSL's patented Silent Vu™ optic system - designed to remove harsh glare and provide perfectly soft, even light throughout the space. Each system offers interchangeable optics to create various distribution patterns and media options offering total light control for general, task and accent lighting. Housings are easy to handle, easy to install and ideal for commercial and residential projects.