Intended use: The STL combines digital LED lighting and controls technologies with high-performance optical design to offer the most advanced surface-mount luminaries for general ambient lighting applications. High-efficacy light engine delivers long life and excellent color, ensuring a superior quality lighting installation that is highly efficient and sustainable. Construction: Housing is roll formed from code-gauge steel. Impact modified linear-faceted refractor with light diffusing film. Refractor attaches to die cast ends by simple hook and pin design with controlled tension provided by sonically welded end plate, providing secure installation and easy maintenance. Decorative die-cast end caps provide added durability. Finish: All metal parts are post-painted in white polyester powder coat for smooth, finished edges and uniform light distribution. Natural aluminum finish available on end caps. Injection-molded plastic light traps prevent light leaks between shielding and end plates and centers diffuser on channel. Optics: Volumetric illumination is achieved by creating an optimal mix of light to vertical and horizontal work surfaces, rendering interior space, objects and occupants in a more balanced luminous environment. Light distribution is carefully controlled at high angles, providing just enough luminous flux to create the volumetric effect. Angled mounting surface combined with crescent-shape linear faceted refractor system obscures and integrates individual LED images and uniformly washes fixture surface with light. Electrical: Long-life LEDs, coupled with high-efficiency drivers, provide superior quantity and quality of illumination for extended service life. STL is rated to deliver L80 performance for 50,000 hours. Optional nLight® embedded controls continuously monitor system performance, allow for constant lumen management / compensation function, facilitate simple “plug-and-play” network and controls upgrading via Cat-5 cable. LED AccuDrive™ driver delivers full-range dimming from 0-10V control signal. Ballast disconnect provided where required to comply with US and Canadian codes. Listings: CSA certified to meet U.S. and Canadian standards. Design Lights Consortium® (DLC) qualified product.. Patents pending. Damp listed.