The Metalux 22CGT3540C is a CGT LED Panel with a 4000K color temperature, 3582 Lumens, and surface/suspended mounting. Its steel housing is post-painted to increase efficacy, facilitate installation, and inhibit corrosion. It has an extruded aluminum door frame with welded and ground mitered corners that tightly seals to the housing for optimal performance and aesthetics. Its thin 2-1/8” inch height fits in shallow plenums with room to spare, and numerous KO with access plate makes it easy to wire and improves installation speed. Acrylic micro-optics provide uniform illumination from corner to corner across the entire lens for maximum aesthetic appeal. The 22CGT3540C generates up to 117 lumens per watt for up to 50% energy savings versus fluorescent lighting. Projected lumen maintenance for the based on TM21 testing standards is >L84, @60,000 hours. The 22CGT3540C comes with a 5-year warranty for guaranteed quality.