The energy-saving effect and prediction method under various illuminance distribution types

► Human visual characteristics may be able to applied in energy-saving of lighting. ► When illuminance distribution is more uniform, the equivalent illuminance is lower. ► When the equivalent illuminance is lower, the perceived brightness is higher. ► A simple prediction equation for energy-saving effect of lighting is established. ► The type “one-room-one-light” commonly seen in houses may have latent energy waste.