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Standards and photometric basics


DIN EN 12193 (2019-06) contains specifications for the lighting of sports facilities with the aim of enabling good visual conditions for athletes, referees, spectators and television and film recordings.


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Optimization of the visual information intake during the sports event
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Maintenance of visual performance
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Creation of a pleasant and inviting visual ambience
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Achieving optimal visual

(light, dark, color contrasts)

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Limitation of disturbing and scattered light

(light pollution, wastage)

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Illumination of the main area as uniform as possible

(relevant playing area)


Regarding uniformity, we consider the lowest (Emin), the average (Eav) as well as the maximum (Emax) horizontal illuminance measured in the unit LUX at height 0m. The light is uniformly distributed if the illuminances at the evaluation points are similar. The uniform distribution of light is specified as

U2 horizontal: ratio of minimum to average illuminance

U1 horizontal: ratio of minimum to maximum illuminance

The grid of evaluation or measurement points is, for example, 1/20 in length and width for football pitches and 1/10 for tennis courts.


What the UGR (Unified Glare Rating) method is for office lighting, the GR (Glare Rating) model of the International Commission on Illumination CIE is for outdoor installations.

The brightness of the illuminated sports surface is related to the brightness of the light sources. The calculated ratio ranges on a scale from ten for "no glare" to 90 for "intolerable glare" (see standard EN 12464-2).


The color rendering index CRI Ra represents how true-to-life colors are reproduced under artificial lighting. The reference value here is sunlight with a CRI of 100.


The light color of a lamp describes the inherent color of the emitted light. It is specified in Kelvin and ranges from warm white with 2700K to 3000K, neutral white from 4000K to 4500K, cool white from 5000K to 6000K. The color temperature has a high influence on the experienced mood. In outdoor facilities, the use of "too cold" light with a high blue content should be avoided to protect insect species that are attracted to it.


The amount of light emitted by a luminaire is expressed in lumen. This value does not change regardless of the beam angle or distance.


The lighting level of a lighting installation decreases during its service life as a result of

ageing of the luminaires, their control gear and lenses (clouding)

Contamination of the lamps and reflectors

ageing (darkening, reduced reflection) of the illuminated surfaces.

The maintenance factor is a numerical value that defines the ratio of a maintenance value to the new value of a (physical) quantity. The maintenance intervals must be agreed between the designer and the operator.

A specified useful life in hours is that design period during which y % (By) of a group of LED luminaires of the same type in operation show a parametric failure under test conditions.

The planning shall be carried out in such a way that the original specifications (taking into account light degradation, etc.) can be met until the end of the expected service life.

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We advise you!

» Personal advice

» Individual lighting design

» Project-Full-Service