Look for shadows, especially over work areas and on stairways.Measure the average illumination throughout the workplace.To detect insufficient light, try the following: The percent value refers to the amount of light that a surface reflects relative to the amount that falls on the surface. Suggestions for the percent of light reflected off surfaces in a typical office include: The amount of light reflected off a surface can be measured. To reach proper light levels and uniform light distribution in the visual environment, many light fixtures are designed to reflect light off walls, ceilings and objects. **Lux = Lumens (quantity of light) per square metre. Illuminating Engineering Society of North America, 2000. Performance of very prolonged and exacting visual tasks Performance of visual tasks of low contrast and very small size over a prolonged period Performance of visual tasks of low contrast or very small size Performance of visual tasks of medium contrast or small size Performance of visual tasks of high contrast or large scale Working spaces where visual tasks are only occasionally performed Simple orientation for short temporary visits Depending on the factors noted above, adequate general lighting is usually between 5 lux when measured 76 cm (30 inches) above the floor.*Įxamples of industrial and office tasks and the recommended light levels are in the table below. The amount of light falling on a surface is measured in units called lux. Type of surfaces (does it reflect or absorb light).Type of task being done (such as demands for speed and accuracy).The amount of light we need varies and depends on:
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