illuminance


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illuminance

Quotient of the luminous flux, F, incident on an element of surface divided by the area, A, of that element of surface. Symbol: E. Thus
E = F/A
The units are in lux or footcandles. Syn. illumination. See inverse square law of illumination; photometer.
References in periodicals archive ?
As for energy consumption in existing lighting environments, the average illuminance values in 17 domestic residential spaces were measured and presented in Figure 1.
During illuminance characterization, results were gathered from all screen printed and basic airbrushed devices but only three out of the five in-mold made parts illuminated over the whole area of the EL device; and of those three, all failed at the highest operating conditions (the values recorded during the test were the highest illuminance achieved before failure).
This can be achieved with axially symmetrical light distributions with closely spaced illuminance distribution perpendicular to the wall to effectively illuminate high walls and minimize spill light in the room (Figs.
The work plane daylight illuminance, as well as heating, cooling, and lighting, energy consumption was measured.
Sensitivity as a Function of Spatial Frequency and Illuminance
This point was chosen because it corresponds to the point B 50 L of the European beam pattern, the so-called glaring point in the beam pattern that causes the largest glare illuminance. For the U.
The CL-200 Light Source Chroma Measurement System from Minolta Corp.'s Instruments Div., Ramsey, N.J., can measure tristimulus colorimetrics, chromaticity, color difference, and both color temperature and illuminance of light sources.
We switched on the ceiling flourescent lighting fixtures, which produced a measured (Digital Light Meter, Model LX-101; Edmonds Scientific Co., Barrington, NJ) illuminance level of 575 lx on the table top in front of the subjects.
The Iluminating Engineering Society of North America publishes guidelines for minimum maintained average illuminance, interior and exterior, ambient and task light.
TracePro 2.0.4 provides enhanced support of standard illumination output formats for the Illumination Engineering Society and Eulumdat, and DXF output for irradiance and illuminance maps.
Generally, ambient illuminance levels should be lower than horizontal illuminance levels (foot-candles on the desktop) required for lighting individual tasks.
The Type 217 Light meter measures approximately 2[inches]x2[inches]x3.5[inches] in its case and is ideal for field surveys of illuminance in schools, hospitals, kitchens, warehouses, offices, maintenance shops, and any other place where good illumination is essential.