Illuminance values

Illuminance values

Standards for lighting and illuminance in the United States are established by the Illuminating Engineering Society of North America (IESNA) and are summarized in its handbook, which shows categories and ranges of illuminance.
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The correct classification of workplace by a type of operations performed plays an important role in the development of designs of energy-saving lighting systems, since the illuminance values, which the lighting system is to be dimensioned to, are based just on these documents [8].
For instance, all Handbook recommended lighting standards, which get adopted into the energy codes, mandate quantitative illuminance values and concomitant LPDs, but no qualitative values for user benefits.
Since walls are located in the main field of vision and illuminated walls contribute to a subjective sense of brightness, this type of lighting has particularly high relevance for perception-oriented and efficient illumination of rooms, although lighting guidelines are often limited to specifying horizontal illuminance values [Cuttle, 2010; Krautter and Schielke, 2009; Loe and Rowlands, 1996].
A limitation of the daylight autonomy index is that it excludes illuminance values slightly below the threshold and that it does not consider the problem of glare due to excessive daylight.
The results are shown in Table 5, indicating relative illuminance values but not against benchmarks.
Contour lines are drawn through illuminance values.
Similarly, in lighting, illuminance values for interiors are often given with decimals.
Illuminance values were collected for 300 days, every 10 minutes, including daytime.
The lighting electricity demand then can be determined from the illuminance values for each time step.
Figure 3 shows typical ranges of vertical illuminance values that can be expected for a variety of interior and exterior conditions.
The predicted stray light illuminance values measured for each shield and luminaire orientation are shown in Table 1.
Because assumptions are required to quantify both energy performance and illuminance values, a relative approach has been used.