1. a unit of luminance equal to one lumen per square centimeter
Usage: physics; technical

Examples

• The lambert is used to measure the brightness of surfaces in photometry.
• Scientists measured the luminance in lamberts to determine the screen’s visibility.
• The old unit lambert has largely been replaced by the candela per square meter.
• Photography equipment sometimes references lambert values for light measurement.
• The lambert unit was named after physicist Johann Heinrich Lambert.