Lighting an outdoor tennis court to FFT standards: lux, uniformity and layout

Lighting an outdoor tennis court to FFT standards must combine a sufficient illuminance level, good uniformity and strict glare control: the player follows a small, fast ball, often looking upwards. The French Tennis Federation sets precise targets in lux and uniformity, to be met for court approval. This article details these requirements and the contribution of LED lighting.

FFT illuminance levels outdoors

For an outdoor tennis court, the FFT sets an average illuminance level of 300 lux to be maintained. As lighting loses flux over time, it is recommended to aim for a higher average when the system is accepted in order to keep the required 300 lux durably (of the order of 400 to 500 lux at commissioning according to federation sources). Higher-level competitions (national tournaments, highly exposed courts) require higher levels; the rules of the competition concerned should then be consulted.

Average illuminance is calculated on a grid of 15 points distributed over the playing area. It is an arithmetic mean: that is why uniformity must be checked in parallel, otherwise dark areas may remain despite a correct average.

Uniformity: the decisive comfort criterion

The uniformity coefficient (Emin/Emoy, or U0) must be greater than or equal to 0.7 for a compliant court. High uniformity avoids disturbing contrasts between the back of the court and the service area, and guarantees regular perception of the ball over the whole surface. Reaching 0.7 outdoors, with a limited number of light points, requires suitable optics and a rigorous layout, validated by photometry.

Anti-glare and side layout

Glare is the number one enemy on a tennis court: serves and lobs make the player look up towards the sources. A side layout, with columns distributed along the sides of the court (and not at the end of the court facing the players), is the rule. The luminaires must be high enough and aimed so as to direct the flux towards the playing surface while keeping the source out of the direct field of view. The use of asymmetric optics and good glare control (UGR/GR) is decisive; this subject is covered in depth in our article on UGR and glare in sports lighting.

Outdoors, the ingress protection of the luminaires must withstand bad weather (high IP rating) and impacts. A neutral to cool white colour temperature and a good colour rendering index (CRI) improve the visual sharpness of the ball.

Why LED for an outdoor court

LED has replaced the old solutions on outdoor courts thanks to its luminous efficacy (lm/W), its instant start (no warm-up time before a match), its long lifetime and its flux stability. Control also makes it possible to adjust illuminance between training and competition, and to switch off instantly after use to limit consumption and light pollution. Find our solutions in the outdoor tennis and padel range, and the example of performance of the GALAXY HP 170 lm/W linear luminaire.

For indoor use, the constraints differ (reflections, ceiling height): see our recommendations for lighting an indoor tennis hall. And if your club is developing padel, see lighting a padel court to FFT standards.

Maintenance factor: aiming above 300 lux

A point often overlooked: the 300 lux required by the FFT is a level to be maintained, that is, kept throughout the life of the installation, and not a value to be reached only on the day of acceptance. Yet the luminous flux of luminaires decreases gradually, and the soiling of optics outdoors accentuates this loss. That is why the sizing includes a maintenance factor: the power installed makes it possible to obtain, at commissioning, a higher average (of the order of 400 to 500 lux according to federation recommendations) which will decline to the required threshold before the next maintenance.

The quality of the LEDs and drivers, their thermal management and the ingress protection of the luminaires directly determine how quickly this degradation occurs. A long useful life (expressed as L80 or L70, that is, the maintenance of 80 % or 70 % of the initial flux) limits the oversizing needed and spreads out maintenance interventions, which is particularly welcome on floodlights installed at height.

How many columns and what layout to plan

The number of columns and floodlights depends on the size of the court (singles or doubles), the mounting height chosen and the optics selected. A classic side layout is based on four to six columns distributed along the sides of the court, at a height that gives the right angle of incidence on the playing surface. The greater the mounting height, the easier it is to control glare and obtain uniformity, at the cost of a higher investment in columns. The right compromise is determined by calculation, balancing the number of light points, unit power, target uniformity and budget. Only photometry makes it possible to fix these choices before purchase, avoiding undersizing (non-compliance) as well as oversizing (extra cost and overconsumption).

Control and energy savings

An outdoor court is only lit on demand, often in the evening. Controlling the LED installation brings substantial savings here: a timer or online booking so that lights are only on during actual occupation, dimming to adapt the level between training and competition, and instant switch-off at the end of play. Beyond the savings, these functions reduce light pollution for the neighbourhood, an increasingly sensitive subject for clubs and local authorities. The high luminous efficacy of the luminaires (lm/W) and fine control combine to lower the bill clearly compared with old floodlights, while remaining compliant with FFT requirements.

FAQ

How many lux for an outdoor tennis court to FFT standards?

The FFT sets 300 lux to be maintained for an outdoor court. It is recommended to obtain a higher average when the system is accepted in order to keep this level durably. Higher-level competitions may require more: refer to the rules of the competition.

What illuminance uniformity must be reached?

The uniformity coefficient (Emin/Emoy) must be greater than or equal to 0.7. It is an essential comfort criterion for following the ball over the whole surface of the court, measured on a grid of 15 points.

How can players be prevented from being dazzled outdoors?

By favouring a side layout (columns at the sides, never facing the players at the end of the court), sufficient mounting height and asymmetric optics that direct the flux towards the ground while keeping the source out of the field of view. Glare control must be checked by a photometric study.

What ingress protection rating for outdoor floodlights?

The luminaires must have a high level of sealing to withstand rain and dust, as well as good impact resistance. An IP rating suited to outdoor use and a robust fixing on the column guarantee the durability of the installation.

Need a photometric study?

The audit and the photometric study are the work of a lighting design office: we recommend the expertise of the Luminance Consulting agency, the lighting design office that contributes to developing our ranges of luminaires based on an in-depth analysis of the needs of the most demanding customers. Luminance carries out the audit of your installation, the DIALux study and the compliance check. Rexylum, for its part, designs and supplies the prescribed luminaires and lighting solutions: for the choice of equipment, contact us.