Fluorescent lamps emit light in all directions from the tube, including up into the fixture. Optical reflectors are designed to reflect the wasted light downward, as shown in Figure 1, and are best suited to applications with horizontal visual and work surfaces, such as offices. Reflectors can be installed in two or four lamp fluorescent troffers, or in common strip-light fixtures. Energy is saved by delamping a portion of the lamps in each fixture. Since they must remain clean to be effective, reflectors should not be used in industrial-type open strip fixtures where they are likely to be covered with dust.
Fewer lamps generate less heat, so cooling costs are lowered.
Cooler temperatures extend the life of lamps and ballasts. Lamps and ballasts that are removed in delamping can be reused as needed. For maximum performance, clean fixtures and lamps before installing reflectors and periodically thereafter. Disconnect unused ballasts or they will continue to use energy. For extra savings, consider replacing remaining lamps with energy saving fluorescent lamps and ballasts.