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(General Physics) the luminous flux incident on unit area of a surface. It is measured in lux. Symbol: Ev Sometimes called: illumination Compare irradiance


(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]
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"
References in periodicals archive ?
The deviation in the user set levels was large with both of the tested lightings and there were indications that adjustment range affected to user set illuminances.
For these spaces, especially when they are deep plan, illuminances will rarely be in the range 100-2000 lux across all the work plane at any one instant.
By overlaying Isofootcandle Plots, a rough idea of illuminances can be accomplished by adding the values of each contour where they intersect (figure 11.
5, it will be allowable for designers to design to reduced illuminances, to maintain the same visual acuity as presumed in the IES Illuminance Determination System.
It would be beneficial to have a time- and cost-effective method to predict illuminances in the surgical site and to test if a virtual prototype of a surgical luminaire complies to [IEC 2009], before building the device.
Later, two advanced daylight metrics were brought into use: daylight autonomy (Reinhart, 2002; Tzempelikos and Athienitis, 2005, 2007) and useful daylight illuminances (Nabil and Mardaljevic, 2005, 2006; Shen and Tzempelikos, 2010).
Statistical analysis of the results did not indicate differences between illuminances ratios found using the six visual equality objectives to be significant.
The box plot in Figure 1 shows the range of desktop illuminances, with the workstations grouped by their distance from the window and window orientation.
Measurement day and the outdoor diffuse and global horizontal illuminances and irradiances at each time step (five minutes).
Daylight illuminances inside a room are, however, not only comparative to the peripheral illuminance but also depend on the exact sky luminance dissemination at any given time.
6(a) shows the BER performance of the solar cell Rx at different illuminances with the corresponding eye-diagrams.
Most indoor lighting design is based on providing levels of illuminances while the visual system deals with light reflected from surfaces i.