ASTRONOMICAL QUANTITIES A  B  C  D  E  F  G  H  I  J  K  L  M  N  O  P  Q  R  S  T  U  V  W  X  Y  Z                    HOME ABOUT CATEGORIES SITE MAP COPYRIGHT ADVERTISE CONTACT entire Web this site illuminance Also known as luminous flux density, the total amount of visible light falling on a point on a surface from all directions above the surface in a given time. It is equivalent to irradiance weighted with the response curve of the human eye. Illuminance is measured in lux (lx), or lumens per square meter (lm/m2). Related category    • ASTRONOMICAL QUANTITIES Also on this site: Encyclopedia of Alternative Energy & Sustainable Living Encyclopedia of History Transport Concepts & Designs (partner site) BACK TO TOP