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American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(General Physics) the luminous flux incident on unit area of a surface. It is measured in lux. Symbol: Ev Sometimes called: illumination Compare irradiance
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ɪˌlu məˈneɪ ʃən)

1. an act or instance of illuminating.
2. the state of being illuminated.
3. a decoration of lights.
4. Sometimes, illuminations. a display using lights as a major decoration.
5. intellectual or spiritual enlightenment.
6. the intensity of light falling at a given place on a lighted surface; the luminous flux incident per unit area, expressed in lumens per unit of area.
7. a supply of light.
8. decoration of a manuscript or book with a painted design in color and gold or silver.
9. a design used in such decoration.
[1300–50; Middle English < Latin]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.illuminance - the luminous flux incident on a unit area
brightness level, luminance, luminosity, luminousness, brightness, light - the quality of being luminous; emitting or reflecting light; "its luminosity is measured relative to that of our sun"
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
References in periodicals archive ?
Second, a colorimeter is installed in the center of the ground toward which the lighting device generates the light vertically; additionally, the electric meter and camera are installed at the proper locations to collect the basic data including optical characteristics such as illuminance and color temperature, changes in power consumption, and so forth.
The light offers bright, energy-efficient lighting, long lifespan and reliable operation while creating an ultra-bright, evenly distributed daylight illuminance of 1,200 lux.
Gigahertz-Optik's BTS256-E Light Meter provides all necessary illuminance, color and spectral data to fully qualify solid state lighting and any other type light source.
A light meter was used to measure the illuminance (in lux) of each device; the light meter was cradled in a holder (made in house) while characterizing the samples.
of scenes: 12 Lighting: Peripheral lighting, task illuminance Dependent variables: Affective state Loe, Mansfield, Luminance within 40[degrees] Space: and Rowlands horizontal band about the line Conference room (1994) of sight was most important in determining the perception of brightness.
Revlon Illuminance Creme Shadow in Wild Orchids, $7, drugstores
"We will bring in our LED downlights which can provide even or more illuminance with less energy consumption.
9 In science, illumination and illuminance means the intensity of what on a surface?
In addition, the Area Lighter's modular optical ring design produces superior vertical illuminance, efficiently delivering the required amount of light without wasteful or irritating light spill into neighbouring areas.
Littlefair (2001) provided a design tool that calculates where global horizontal radiation and illuminance reach the buildings envelopes.
The GP2AP020A00F can detect illuminance as low as 0.02 lux (compared to 0.1 lux for the predecessor product(3), one of the best light detection levels in the industry.