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Viimati uuendatud: 25.02.2017


Usually, lighting at a workplace consists of ambient lighting, or ambient lighting and spot lighting combined. Ambient lighting, which consists of ceiling and all lamps, lights the entire room. Spot lighting is present at the employee’s workplace and illuminates the work object.

The volume of created light decreases as the light source ages. Light amount is decreased by the wear and tear of the light source, or the dirtiness of lamps, walls, reflection and anti-reflection devices. Bad ambient lighting and lack of spot lighting trigger an incorrect working position and fatigue, and decrease the quality and productivity of work. Background lighting must guarantee the even spread of light throughout the room. Light intensity must be suitable for the work characteristics. Work with small particles or components requires a more intense lighting. The colour scheme of the room is also important – floors, walls and ceilings should be in lighter shades.

Illuminance equals the light flow and surface area ratio.

Workplace lighting must be sufficient, but the light may not blind employees. Lighting glare is caused by too bright areas in the visual field. It can appear as an inconvenience glare, blinding glare or glare caused by the reflection of shiny surfaces, called reflection glare or veiling glare. Blinding glare could cause occupational accidents, faults in technological processes and fatigue.

Guaranteeing the normal illuminance of workplaces is at the employer’s responsibility. Insufficient illuminance could cause occupational accidents, tired eyes and decreased eyesight. Excess illuminance, bright light and lighting source with an inappropriate spectrum could also cause the fatigue in eyes, loss of eyesight and general fatigue, but also occupational accidents. 

From the working environment surveying perspective, the artificially lit internal environment is of most importance.

Illuminance must be measured during the execution of working tasks and during the working time. Illuminance must be measured in a company periodically, following the recommendations of the project compiler or lighting specialist, but also when employees have any complaints. Compliance with the maintenance values must also be checked. Company working environment specialist can measure the illuminance themselves, if trained accordingly.

Illuminance is measured with a lux meter. The indicator device or lux meter must be calibrated once a year. Requirements on the measuring devices concerning the illuminance, brightness distribution and glare are provided in the standard EVS 891.

Standard EVS-EN 12464-1 provides the recommended illuminance values for different workplaces.

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