Multilayer Polarizer Panels

Fluorescent lamp luminaires with multilayer polarizer panels produce partially polarized light*, which can increase the contrast of a visual task under some viewing conditions. In principle, a decrease in illuminance can accompany an increase in task contrast without affecting visual performance. Because a reduction in illuminance implies a reduction in the electric power used for lighting, multilayer polarizer panels have been promoted as energy-saving devices. This issue of Lighting Answers discusses the effectiveness of multilayer polarizer panels as a means of maintaining visual performance at reduced illuminances and, thus, as energy-saving devices in typical commercial spaces.