Glossary - Stadiums & Arenas

UEFA Stadium Lighting Guide 2023

Content Type
UEFA Guidelines
Category
Stadium & Arena
Subject
Stadium Lighting
Edition
2023
Language
English
Enforcement Date

E

The illuminance, the quantity of light falling on a surface at a given point, measured in lux.

Eh ave

The average illuminance on the horizontal plane for the specified reference test points 1.0m above the pitch surface, measured in lux.

Eh max

The maximum illuminance on the horizontal plane for the specified reference test points 1.0m above the pitch surface, measured in lux.

Eh min

The minimum illuminance on the horizontal plane for the specified reference test points 1.0m above the pitch surface, measured in lux.

Ev ave

The average illuminance on the vertical plane for the specified reference test points 1.0m above the pitch surface, measured in lux.

Ev 270°

The illuminance on the 270° vertical plane for the specified reference test point 1.0m above the pitch surface, measured in lux.

Ev4 (4-point ave)

The average of the illuminance values for the four vertical planes at a specified reference test point 1.0m above the pitch surface, measured in lux.

Ev4-96 min (4-point min)

The minimum value for Ev4 (4-point ave) at each of the 96 reference points.

Ev4-96 max (4-point max)

The maximum value for Ev4 (4-point ave) at each of the 96 reference points.

Ev4-96 ave (4-point ave)

The average value for Ev4 (4-point ave) at each of the 96 reference points, measured in lux. Calculated by adding together the values for Ev4 (4-point ave) at each of the 96 reference points and dividing the total by 96.

Ev 270° ave

The average illuminance on the 270° vertical plane for the specified reference test points 1.0m above the pitch surface, measured in lux. Calculated by adding together the values for Ev 270° at each of the 96 reference points and dividing the total by 96.

Ev 0° max

The maximum illuminance on the 0° vertical plane for the specified reference test points 1.0m above the pitch surface, measured in lux.

Ev 180° min

The minimum illuminance on the 180° vertical plane for the specified reference test points 1.0m above the pitch surface, measured in lux.

Ecam ave

The average illuminance towards the main camera for the specified reference test points 1.0m above the pitch surface, measured in lux.

lux

The unit of measurement for illuminance. 1 lux = 1 lumen/m2

lumen (lm)

The unit of measurement for luminous flux.

illuminance

The quantity of light falling on a surface at a given point, measured in lux.

CRI

CRI The Colour Rendering Index measures the quality of the colour reproduction produced by a light source relative to that produced by a reference illuminant. See ILV 17-222 on a scale of 0 Ra to 100 Ra.

Ra

Ra The general version of assessing colour rendering of a specific value given to a light source to indicate the level and quality of CRI on a scale of Ra 0 to Ra 100. Ra is calculated as the average value of the eight pre-defined reference colours R1 to R8.

Re

Re The extended version of assessing colour rendering using 15 reference colours. The specific value given to a light source to indicate the level and quality of Colour Rendering Index (CRI) on a scale of Re 0 to Re 100. Re is calculated as the average value of the pre-defined colour references R1 through R15.

TLCI

TLCI Television Lighting Consistency Index. An alternative method for evaluating the chromaticity of a light source within the television environment.

Tc

The colour temperature of a light source, measured in Kelvin (K).

FF

Flicker factor is the amount of luminance modulation on a given plane during a complete cycle. It is calculated by measuring the ratio between the maximum and minimum illuminance values, expressed as a percentage.

RG

The glare rating – the degree of discomfort caused by the illuminance system to a person on the pitch. The glare rating is calculated at a height of 1.75m above the pitch surface.

MAUR

The minimum adjacent uniformity ratio. The maximum permissible difference between any two adjacent points on any given plane in any direction is determined by the MAUR stipulated in the relevant table in UEFA illuminance requirements.

U1h

A measure of horizontal uniformity of illuminance. The ratio of the minimum value on the horizontal illuminance to the average value of the total sum of horizontal illuminance values across all 96 reference points (the average value is calculated by dividing the total sum of the 96 values by 96).

U2h

A measure of horizontal uniformity of illuminance. The ratio of the minimum horizontal illuminance value to the maximum value of horizontal illuminance of all 96 reference points.

PISM

Pitch illuminance switch mode. The pitch illuminance system should be pre-programmed with various different modes, catering for a variety of situations. The number of such modes may vary from stadium to stadium.

FMM

Full match mode, which is when the complete pitch illuminance system operates under match conditions at the appropriate UEFA illuminance level.

MM

Maintenance mode, which provides sufficient pitch illuminance for maintenance requirements.

MCM

Match continuity mode, which allows a match to continue after the primary power supply has failed. Only U1 is evaluated for illuminance uniformity: U1 must be greater than 0.5 on the horizontal plane and 0.4 on the vertical plane.

TM

Training mode, which provides sufficient pitch illuminance for training requirements.

Main camera side

Also referred to as the 270° plane, this indicates the plane of the main camera position for a television broadcast. The main TV camera will be located on the TV camera gantry. This term is used in this guide to ensure that the pitch orientation is correct and consistent for all stadiums.

Main camera position

This refers to the position of the main camera for a television broadcast. The main TV camera will be located on the TV camera gantry. This term is used in this guide to ensure that the pitch orientation is correct and consistent for all stadiums.

Direct point source luminous flux

This refers to luminous flux emitted by a luminaire. Luminaires that have no or only limited control of luminous flux may cause a person to observe a significant number of light sources in an LED luminaire. Direct point source luminous flux will often create a greater level of discomfort glare (RG) for an observer/player.

FPSL

Floodlight power supply level. Used to determine the type of power supply to be used with the pitch illuminance system.

Primary source

Grid power source that feeds a stadium floodlight system in normal operation mode.

Secondary source

Second grid power source that is fully independent from the primary source and that is either in use for normal operation mode (when the stadium is designed to be fed by two independent grid sources in normal operation mode) or that can be switched to if the primary source fails.

Backup system

A stadium’s own power source, e.g. diesel generators, battery systems   or rotating systems, that is used to back up the floodlighting (and other) system to reach the required service levels.