These LED drop-ceiling flat panel light fixtures feature Invictus Lighting’s patented watt selectable control system, and very high efficacies, reaching over 130 LpW! It eliminates the risk of purchasing & installing the incorrect fixture wattage or light output. Should more or less illumination be desired, simply adjust the fixture for the correct power/light level. These are the only flat panel lights available that allows for selecting the exact wattage desired, with the ability to custom tune each area for maximizing savings and optimizing of the ROI. Wall dimmers can be used; however, the watt selector limits the max output to the desired level. Light is uniform throughout the entire fixture. It can be used as a direct replacement of existing fluorescent troffer lights, or for new construction installation offering a clean, tidy appearance. They are universal voltage input (120-277vac), and are housed in a thin profile, yet sturdy structure assuring easy installation and are excellent when extra clearance is required above the ceiling due to HVAC, pipes, and beams that could interfere with mounting depth. The perfect troffer solution!