03-04-2015, 10:53 AM
Characteristics of Lighting Arrangement
Any good lighting design must meet functional and ergonomic requirements while taking cost-effectiveness into account.
Level of illumination
A mean level of between 300 lx (individual offices with daylight) and 750 lx (large rooms) is required in work areas. Higher illumination can be achieved by adding extra lights at workplace.
Light direction
Light should fall on a working position from the side.
Limitation of glare
Direct glare, reflected glare and reflections from monitor screens should all be limited. Limiting direct glare is achieved by using lights with shading angles. Limiting reflected glare is achieved by directing light from the side Onto the working position. Limiting reflections from monitor screens requires the correct positioning of the screen.
Distribution of luminance
The harmonic distribution of luminance is the result of a careful balance of all the degrees of reflection in the room. Luminance due to indirect lighting must not exceed 400 cd/rn2.
Colour of light and colour rendering
The colour of the light is determined by the choice of lamp. A distinction is made between three types: warm white light (colour temperature under 3300 K), neutral white light (3300—5000K) and white daylight (over 5000K). In offices, most light sources are chosen in the warm white or neutral white ranges.
Calculation of point illuminance levels .
The illuminance levels can be determined from the luminous intensity and the spatial geometry using the photometric distance principle.
Any good lighting design must meet functional and ergonomic requirements while taking cost-effectiveness into account.
Level of illumination
A mean level of between 300 lx (individual offices with daylight) and 750 lx (large rooms) is required in work areas. Higher illumination can be achieved by adding extra lights at workplace.
Light direction
Light should fall on a working position from the side.
Limitation of glare
Direct glare, reflected glare and reflections from monitor screens should all be limited. Limiting direct glare is achieved by using lights with shading angles. Limiting reflected glare is achieved by directing light from the side Onto the working position. Limiting reflections from monitor screens requires the correct positioning of the screen.
Distribution of luminance
The harmonic distribution of luminance is the result of a careful balance of all the degrees of reflection in the room. Luminance due to indirect lighting must not exceed 400 cd/rn2.
Colour of light and colour rendering
The colour of the light is determined by the choice of lamp. A distinction is made between three types: warm white light (colour temperature under 3300 K), neutral white light (3300—5000K) and white daylight (over 5000K). In offices, most light sources are chosen in the warm white or neutral white ranges.
Calculation of point illuminance levels .
The illuminance levels can be determined from the luminous intensity and the spatial geometry using the photometric distance principle.
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