light unit

/laɪt ˌjunət/

Other forms: light units

Definitions of light unit

1. noun

   a measure of the visible electromagnetic radiation
   types:

   illumination unit

   a measure of illumination

   luminance unit

   a measure of luminance

   luminous flux unit

   a measure of luminous flux per unit area

   candlepower unit, luminous intensity unit

   a measure of luminous intensity

   exposure

   the intensity of light falling on a photographic film or plate

   footcandle

   a unit of illuminance on a surface that is everywhere 1 foot from a point source of 1 candle

   L, lambert

   a cgs unit of illumination equal to the brightness of a perfectly diffusing surface that emits or reflects one lumen per square centimeter

   lux, lx

   a unit of illumination equal to 1 lumen per square meter; 0.0929 foot candle

   phot

   a unit of illumination equal to 1 lumen per square centimeter; 10,000 phots equal 1 lux

   nit

   a luminance unit equal to 1 candle per square meter measured perpendicular to the rays from the source

   foot-lambert, ft-L

   a former luminance unit equal to one lumen per square foot

   lm, lumen

   a unit of luminous flux equal to the amount of light given out through a solid angle of 1 steradian by a point source of 1 candela intensity radiating uniformly in all directions

   candela, candle, cd, standard candle

   the basic unit of luminous intensity adopted under the Systeme International d'Unites; equal to 1/60 of the luminous intensity per square centimeter of a black body radiating at the temperature of 2,046 degrees Kelvin

   international candle

   a former international unit of luminous intensity; now replaced by the candela

   type of:

   electromagnetic unit, emu

   any of various systems of units for measuring electricity and magnetism