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Lighting level
The lighting level has a major influence of performance, productivity and safety at work. However, as
the lighting level increases so too do the costs. Consequently, the recommended values for
illuminance are generally compromises between visibility, comfort, cost and energy consumption.
The lighting level has a major influence of performance, productivity and safety at work. However, as
the lighting level increases so too do the costs. Consequently, the recommended values for
illuminance are generally compromises between visibility, comfort, cost and energy consumption.
Reducing glare
When choosing and positioning lamps and luminaires the danger of glare must be taken into
account. Thus an unfavourable positioning can lead to direct glare (looking directly into the lamp) or
to reflected glare (across shiny or reflecting surfaces). This can impair the vision. In order to minimize
reflected glare surfaces of workplaces should be mat. Furthermore the medium light density at the
room boundaries should not be more than 200 cd/m2 sein.
Directed light and the effects of shadow
For right handed people the light should fall onto the work surface from the left side. Otherwise
shadows could impair perception. Strong contrasts should be avoided.
When choosing and positioning lamps and luminaires the danger of glare must be taken into
account. Thus an unfavourable positioning can lead to direct glare (looking directly into the lamp) or
to reflected glare (across shiny or reflecting surfaces). This can impair the vision. In order to minimize
reflected glare surfaces of workplaces should be mat. Furthermore the medium light density at the
room boundaries should not be more than 200 cd/m2 sein.
Directed light and the effects of shadow
For right handed people the light should fall onto the work surface from the left side. Otherwise
shadows could impair perception. Strong contrasts should be avoided.
Light colours and colour rendering
Only use lamps with good to very good colour rendering (like 9XX series fluorescent lamps or
halogen lamps) in order to naturally represent furnishings and other materials.
Only use lamps with good to very good colour rendering (like 9XX series fluorescent lamps or
halogen lamps) in order to naturally represent furnishings and other materials.
Good colour rendering
Bad colour rendering
Comfort
The Kruithof comfort curve indicates which range of illuminance is seen as comfortable at
which colour temperature.
The Kruithof comfort curve indicates which range of illuminance is seen as comfortable at
which colour temperature.
This shows that lighting systems with low colour temperatures of 2700° to 3000° K are seen
as comfortable in the range from 50 to 100 lux, whereas higher illuminances are seen as
unpleasant. At a colour temperature of 6000° K, for example, illuminances of at least 500 lux
have to be provided so that people in the room feel comfortable.
as comfortable in the range from 50 to 100 lux, whereas higher illuminances are seen as
unpleasant. At a colour temperature of 6000° K, for example, illuminances of at least 500 lux
have to be provided so that people in the room feel comfortable.
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