Dual-Lite LPS35-T 35W Central Lighting Micro Inverter, Recessed Ceilig T-Grid Mount Ceiling T-Grid mount models approved for use in City of Chicago. LIGHTPOWER? Series unit will automatically transfer to emergency mode in less than 1-second and begin supplying pure sinusoidal AC power to the load for 90 minutes The unit is capable of operating normally on, normally off, or switched loads