Lighting assessments for floodlit outdoor sport

A sports floodlighting assessment has to answer two questions that pull in opposite directions. Is there enough light on the pitch for the standard of play proposed, and is there little enough light everywhere else. Councils refuse floodlighting applications on the second question far more often than on the one about pitch light, and the refusals are usually about a curfew nobody agreed, a spill figure nobody modelled or a hedgerow nobody thought about.

Floodlighting normally needs planning permission. There is no permitted development right that covers columns and luminaires on a playing field.

What the assessment has to demonstrate

Six outputs make up a usable submission:

• the design illuminance on the playing surface, with the uniformity ratio, stated against the class of play
• a site layout showing column positions, heights and aiming directions
• the luminaire schedule, with the photometric data file reference for each type
• isolux contours across the site and beyond its boundary, extended to the nearest sensitive windows
• vertical illuminance at those windows, with the figure given for the proposed operating hours and for any period after a curfew
• upward light ratio and the glare figure for the nearest viewpoints

BS EN 12193 sets the lighting classes for sport, from recreational training through club competition to top-level play, and the class drives the illuminance target. Pick the class that matches the actual use rather than the aspiration, because a higher class means more light, taller columns and a harder case. The relevant national governing body usually publishes its own requirement for the standard of play, and Sport England publishes design guidance alongside it.

The obtrusive light side of the assessment is governed by the Institution of Lighting Professionals guidance on reducing obtrusive light, usually cited as ILP GN01. It divides the country into environmental zones, from intrinsically dark areas through rural and village settings to suburban and urban ones, and tabulates limits for each zone. Establish your zone first, with reasoning, because every limit in the document depends on it and an assessment that assumes a suburban zone in a village setting will be sent back.

Column height and luminaire selection

The instinct is to keep columns low because they look less intrusive. For spill light the instinct is wrong.

A low column has to tilt its luminaires towards the horizontal to reach the far side of the pitch, and a tilted luminaire throws light beyond the pitch and into eyes. A taller column aims steeply downwards, puts light where it is wanted and cuts off sharply at the pitch edge. Eight metre columns on a full-size pitch produce more complaints than twelve metre ones.

So the selection sequence runs:

1. Fix the illuminance class and the pitch dimensions
2. Choose the column height that allows a steep aiming angle, commonly 10 to 15 metres for a full-size pitch
3. Specify asymmetric, flat-glass luminaires with no uplight above the horizontal
4. Add shields or louvres where a particular receptor needs them, and show them on the schedule
5. Model, then adjust aiming before adjusting height

Flat glass matters more than anything else on the list. A bowl luminaire with a dropped dish lens emits light above the horizontal by design, and no amount of aiming corrects it.

Spill, glare and sky glow

Three different quantities, three different complaints, three different parts of the report.

Spill is measured as vertical illuminance on the plane of a window, in lux. It is what a neighbour means by light in my bedroom. Model it at the actual window positions, at the actual floor levels, not at a notional point on the boundary.

Glare is about the luminaire being visible as a bright source, and it is assessed through luminous intensity towards the viewpoint. A neighbour can suffer glare from a luminaire that puts almost no light on their window, which is why spill figures alone never settle an objection. Identify the viewpoints where someone will see the luminaire directly and give the intensity figure for each.

Sky glow is the upward light ratio, the proportion of the installation's output going above the horizontal. With flat-glass luminaires and no uplight, direct upward light approaches zero, and what remains is reflected from the pitch surface. Say so, because an officer who sees a zero figure without explanation assumes an error.

The numerical limits for each quantity in each environmental zone are tabulated in GN01, with separate values before and after curfew. Quote the table you have applied and give the zone, rather than asserting compliance.

Modelling what will actually be built

A lighting model is only as good as its inputs, and three inputs get fudged.

Maintenance factor. Luminaires dim and dirty. A design that just achieves the target illuminance when new will fail a survey in year three. State the maintenance factor and the cleaning and replacement interval it assumes.

Terrain and screening. Modelling a flat site that slopes, or including a hedge as a permanent screen when it is deciduous and 2 metres high, produces results that the as-built survey contradicts. Model the ground as surveyed, and treat vegetation as not present unless it is evergreen, mature and secured by condition.

Aiming tolerance. Luminaires are aimed by hand on a cherry picker in the cold. A design that works only at the exact modelled angle will not survive commissioning. Model a tolerance of a degree or two either way and show that the limits still hold.

Submit the photometric files, or at least their references, with the Lighting Assessment. An environmental health officer who cannot reproduce the model will not accept its conclusions.

Curfews and switch-off conditions

The curfew is where most of the negotiation happens. GN01 applies stricter limits after a curfew time, conventionally 23:00 unless the authority sets an earlier one, and councils routinely condition floodlights off at 21:00 or 22:00 on a residential edge.

Three practical points. Propose the curfew yourself, with the fixture-use timetable behind it, because a proposed 21:30 switch-off with a booking schedule attached is far more persuasive than silence followed by an imposed 21:00. Separate training lighting from match lighting if the installation can be switched in parts, and offer the lower setting after a stated hour. And make the condition workable: a timeclock with a manual override that logs use is enforceable, a condition relying on a caretaker's memory is not.

Where the facility also generates noise late in the evening, the curfew argument and the acoustic argument get taken together, and a Noise Impact Assessment covering the same hours makes a coherent package. The point comes up in our note on padel and tennis court noise, where the ball strike noise rather than the lighting drives the hours.

Ecology and keeping a dark corridor

Lighting a pitch beside a hedgerow, a woodland edge or a watercourse raises a protected species issue that is separate from the amenity case. Bats avoid lit commuting routes, and a lit hedgerow can sever a flight line that a colony has used for decades.

The joint guidance from the Institution of Lighting Professionals and the Bat Conservation Trust is the reference point, and it aims at keeping light levels on the feature itself very low while maintaining a continuous dark corridor rather than a patchwork of dark gaps. In practice that means luminaires aimed away from the feature, a buffer of unlit ground, and an isolux plot that shows the illuminance at the hedge line explicitly.

Where bats are a live issue the ecologist and the lighting designer need to work from the same drawing. A lighting scheme signed off in isolation and then presented to an ecologist is the most common cause of a late redesign on these applications.

Verification after installation

The design is a prediction. The condition should require the measurement.

Ask for, or offer, a commissioning survey within a stated period of first use: measured illuminance on the pitch on a grid, measured vertical illuminance at the agreed receptor windows, the as-built aiming schedule and photographs of each column. Anything outside the modelled figures gets re-aimed before the survey is accepted.

That single condition protects everybody. It gives the neighbours a remedy, gives the club certainty that the installation is compliant, and gives the council something enforceable instead of an argument about whose light meter is right. Signage lighting works to a different set of limits again, covered in our note on luminance limits for signs.

Browse the report types to see which environmental documents a floodlighting application usually needs alongside the lighting work.

This is general guidance, not legal advice. Lighting and ecology assessments should be prepared by suitably qualified practitioners, and councils normally expect a qualified author. PlanScope provides AI-assisted draft reports for planning applications. Reports should be reviewed before submission. We do not guarantee planning approval.