They offer efficacies approaching 100 lumens per watt, the highest of any commercial energy source. For more in-depth information, refer to the SmarterEnergy technical article on Sulfur Lamps . The efficacies of common lamps are shown in the Figure 1. All fluorescent lights use a power conditioning device called a ballast that amplifies line voltage to start the lamp, and limits current to maintain its arc. Although standard magnetic ballasts are no longer produced, you may have some existing in your building.
Electronic ballasts are the most efficient.
Learn more about the advantages of electronic ballasts , electronic ballast reliability , and electronic ballast specification . Reducing power to electric lights in accordance with the exact lighting needs of the user and work task. Accomplished with manual or photosensor-controlled dimming devices. For more in-depth information, refer to the SmarterEnergy technical article on Dimming Controls for Lighting. . Typical Applications Table 1 describes typical lighting applications for commercial buildings.