Worlds of David Darling
Encyclopedia of Science
   
Home > Encyclopedia of Science

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