These4ft Narrow LED Linear Strip Luminaires are excellent for general utility applications like garage, warehouse, offices, storage units, stairwell. Color temperature can be switch to 3500K neutral white, 4000K cool white and 5000K daylight. The input wattage can be adjustable to 3 different level that helps you to save energy cost. With the ultra thin design they are perfect for applications with shallow drop ceilings. These fixtures are DLC and UL certified. They are popular in office, warehouse, public area and other commercial area.