What this is
What is a light pollution assessment?
What is a light pollution assessment?
A light pollution assessment examines external lighting for the effect it has beyond the site boundary: spill onto neighbouring land, glare towards residents or road users, and the upward component that contributes to sky glow. It rates the installation against those effects, records whether controls such as shielding, aiming and timing are adequate, and sets out what more is needed.
Why does a lighting upgrade so often create a complaint the old lighting never did?
Newer fittings are typically brighter and whiter than what they replace, and an upgrade is usually specified for output and energy saving rather than direction and shielding. A higher-output fitting aimed the same way as the old one increases spill and glare even though its position never changed, which is why the assessment needs re-running at the point of change.
Who should complete a light pollution assessment?
The site lead, typically working from a night-time inspection rather than a daytime walk, since spill, glare and sky glow are only observable when the lighting is in the condition that generates the complaint. Where a complaint was received, the person who took it should be consulted.
Scope
When is a light pollution assessment required?
This assessment is one step in a larger environmental programme. Using it for noise, a protected-species survey, or a planning condition it was never written against produces a record that answers the wrong question.
Use this template when
- A complaint about glare, spill or sky glow has been received from a neighbour, resident or road user
- Lighting is being installed, replaced or upgraded, including a like-for-like lamp swap
- A permit or planning condition requires a lighting assessment to be carried out or refreshed
- The periodic review interval for the site's lighting has come round
- An incident, such as a near miss involving a dazzled driver, points to the lighting as a contributing factor
Do not use it for
- Environmental Noise Assessment, which assesses noise leaving the boundary against limits, not light
- Biodiversity Assessment, which is the correct instrument for a protected-species survey, not this record's yes/no on wildlife-sensitive areas
- A planning condition requiring a scheme signed off by a qualified lighting engineer, which this record can evidence but not substitute for
- Internal or task lighting complaints, which belong to a workplace lighting or ergonomics assessment
- A one-off visual check with no night-time observation, which cannot confirm spill, glare or sky glow
Compliance mapping
Which ISO 14001 cl.6.1.2 requirements does this satisfy?
Light pollution sits between environmental management standards, which treat it as an aspect to be identified and controlled, and statutory nuisance law, which treats it as a complaint to be resolved.
| Clause | Requirement | Where it lands |
|---|---|---|
| ISO 14001 cl.6.1.2 | Identification of environmental aspects and their associated impacts, including those the organisation can influence | Header |
| ISO 14001 cl.8.1 | Operational control of the identified aspect, established and maintained under defined criteria | Operation |
| ISO 14001 cl.9.1.1 | Monitoring and measurement of environmental performance against the criteria set for the aspect | Spill and glare |
| ISO 14001 cl.10.2 | Reaction to nonconformity, including action to control and correct it | Outcome |
| ISO 14001 cl.7.4 | Communication of relevant environmental information, internally and externally | Related records |
| Environmental Protection Act 1990 s.79(1)(fb) (as amended) | Artificial light from premises prejudicial to health or a nuisance is a statutory nuisance | Outcome |
| ILP Guidance Notes for the Reduction of Obtrusive Light (GN01) | Environmental zone-based limits for sky glow, light intrusion and glare | Spill and glare |
What it does not cover
- Environmental Noise Assessment, which needs its own boundary measurements against noise limits; light spill data does not substitute for it.
- Biodiversity Assessment, which needs a proper survey of species and habitat, not just a yes or no on whether wildlife-sensitive areas were considered.
- A planning-condition lighting scheme, where the condition specifies a scheme certified by a qualified lighting engineer against a named standard.
- A statutory nuisance defence, which needs evidence of best practicable means and a documented response to the specific complaint.
- Workplace or task lighting adequacy, which is an internal illumination question, not an external-effects one.
Global
Light Pollution Assessment requirements by country
No jurisdiction runs a dedicated light pollution regulator. What differs is whether artificial light is a recognised statutory nuisance and how far international guidance substitutes for hard law.
Environmental Protection Act 1990 s.79(1)(fb), inserted 2005
Artificial light prejudicial to health or a nuisance is a statutory nuisance, enforceable by the local authority.
A complaint can trigger formal action, and an assessment showing shielding, aiming and timing is the evidence a site relies on.
Local and state dark-sky and outdoor lighting ordinances; no federal statute
Regulation is local: ordinances typically set fixture shielding, colour temperature and curfew requirements.
The obligation depends on the site's municipality, and a compliant fitting elsewhere may still fail a stricter local rule.
ISO 14001 cl.6.1.2 and cl.8.1; ILP and CIE obtrusive-light guidance
Light is managed as an environmental aspect requiring identification, control criteria and monitoring.
Auditors look for the aspect to be identified and a control basis applied, independent of whether local statute treats light as a nuisance.
How to complete it
How to complete a light pollution assessment, step by step
The template prompts for spill, glare and control measures individually. It does not prompt for the judgement that connects them to the actual complaint or trigger.
Spill, glare and sky glow are only visible with the installation running in the condition that generates the complaint. A daytime inspection confirms fittings are present, not what they send beyond the boundary after dark.
Glare towards a resident's window is a nuisance question. Glare towards a driver is a safety one, and a dazzled-driver near miss carries different consequences than an annoyed neighbour. Rating them together loses the distinction that decides which control is urgent.
Security is the standing reason given for spill a site cannot otherwise defend. Record what lower-spill option was considered and why, rather than treating security as a reason not to assess.
A lamp swap or re-aim changes spill and glare even when nobody thinks of it as a lighting project. Linking lighting changes to this assessment closes the gap that lets an upgrade run unchecked for months.
What auditors find
Most common light pollution assessment findings
The assessment exists on most sites that have had a complaint. The findings concern whether it was re-run when lighting changed, and whether it looked at direction and shielding rather than only output.
| Finding | Clause | What fixes it |
|---|---|---|
| Assessment carried out by day, or from a coverage plan, with no night-time observation from outside the boundary. | ISO 14001 cl.9.1.1 | Require a night-time check from the affected boundary or window, and record the observation conditions. |
| Lighting upgraded or fittings changed with no re-assessment, on the assumption the prior one still applies. | ISO 14001 cl.6.1.2 | Route plant and lighting changes into a re-assessment trigger rather than relying on the periodic interval alone. |
| Glare towards residents and towards road users rated as a single combined judgement. | ISO 14001 cl.8.1 | Assess and record each separately: one is a nuisance control, the other a safety control with different urgency. |
| Security lighting present with continuous operation and no recorded justification for the spill it produces. | Environmental Protection Act 1990 s.79(1)(fb) | Record what lower-spill alternative, such as sensor-triggered operation, was considered and why. |
| Sensors, timers or dimming absent or not functioning, installation running at full output regardless of occupancy. | ISO 14001 cl.8.1 | Verify controls are fitted and operating as intended, not just specified. |
| Action agreed on a failed assessment with no owner, priority or review date recorded against it. | ISO 14001 cl.10.2 | Assign an owner and a next review date when the action is raised, and verify it before closing. |
Case in point
Case in point: the upgrade that lit the first complaint
A distribution yard replaced its ageing sodium floodlights with new LED units as an energy-saving project, specified for coverage and running cost. The new fittings delivered the required lux at ground level on a fraction of the power. Within three weeks the site had received its first light complaint in over a decade, from a house whose bedroom window faced the yard across a public road.
The old sodium units had been dim and poorly aimed, so they under-lit the resident's window along with the yard. The new LEDs were brighter and aimed the same way, since aiming was never part of the upgrade brief, and nobody had connected an energy-saving swap to an assessment obligation. The fix was shielding and re-aiming the existing units, plus the re-assessment trigger the project had skipped.
The template
The template, field by field
The form exactly as it installs. Every field, option, score and conditional rule is editable, and the links to other templates come with it.
5 sections
- Reference
- ENV-042
- Archetype
- Assessment
- Record ID
- LPA-2026-000
- Scoring
- Within limits
- Direction
- High is good
- Singleton
- No
- Basis
- ISO 14001 cl.6.1.2
- Links
- Links Complaints, Biodiversity
- Tags
- Nuisance, Light
- Sections
- 5
- Fields
- 39
- Follow up fields
- 3
- Repeating sections
- 0
- Links out
- 3
Header
12 fieldsAssessment ID*
Auto sequence. Format LPA-2026-000.
The record's own ID. Other templates point at this value.
Status*
Drives who this goes to next.
- Planned2 pts
- In progress2 pts
- Complete3 pts
- Deferred0 pts
- Open0 pts
- Closed3 pts
- Overdue0 pts
Date and Time*
Completed By*
Site*
Site ID*
Format SITE-000.
Links to FDN-001 Site ID
Area
The area within the site.
Exact Location
Drop a pin for anything hard to find.
Assessment Trigger*
Assessed By*
Recent Lighting Change*
The Lighting Upgrade That Created A Complaint
Replacing old yard lighting with brighter units routinely generates the first light complaint a site has ever had. Direction and shielding matter more than output.
Spill and glare
6 fieldsLight Spill Beyond Boundary*
- None3 pts
- Some1 pt
- Significant0 pts
Glare Towards Residents*
- Yes3 pts
- Partly1 pt
- No0 pts
Glare Towards Road Users*
- Yes3 pts
- Partly1 pt
- No0 pts
Upward Light Minimised*
- Yes3 pts
- Partly1 pt
- No0 pts
Shielding Or Cowls Fitted*
- Yes3 pts
- Partly1 pt
- No0 pts
Aiming Angles Correct*
- Yes3 pts
- Partly1 pt
- No0 pts
Operation
6 fieldsLighting Only On When Needed*
- Yes3 pts
- Partly1 pt
- No0 pts
Sensors Or Timers Fitted*
- Yes3 pts
- Partly1 pt
- No0 pts
Dimming Available Overnight*
- Yes2 pts
- No0 pts
- N/Aexcluded from denominator
Security Needs Balanced Against Spill*
- Yes3 pts
- Partly1 pt
- No0 pts
Colour Temperature Considered*
- Yes3 pts
- Partly1 pt
- No0 pts
Wildlife Sensitive Areas Considered*
- Yes3 pts
- Partly1 pt
- No0 pts
Related records
1 fieldComplaint Case ID
Where a complaint prompted this assessment.
Links to ENV-020 Case ID
Outcome
14 fieldsWithin Acceptable Limits*
- Yes3 pts
- Marginal1 pt
- No0 pts
Complaint Received*
- No3 pts
- Yes0 pts
Recommended Controls
Biodiversity Impact Considered*
- Yes3 pts
- No0 pts
Action Agreed*
- Yes3 pts
- Not needed3 pts
- No0 pts
Next Review Due*
Action Required*
Raise the action record, then enter its reference here.
- No2 pts
- Yes0 pts
Priority
- High0 pts
- Medium1 pt
- Low3 pts
CAPA ID
Format CAPA-2026-00000.
Links to FDN-014 CAPA ID
Action Owner
Environmental Lead*
Signature*
Site Manager*
Second Signature*
ENV-042 · record IDs look like LPA-2026-000 · Links Complaints, Biodiversity
Open in KnowellaRun it with agents
From a document you fill in to a programme that runs itself
The form is the easy part. What slips is the re-assessment after an upgrade nobody flagged as a lighting change, and the complaint that arrives before the periodic review does.
Holds the lighting assessment against the site's plant and lighting register, flags an upgrade as a re-assessment trigger, and keeps the complaint linkage current.
Picks up glare towards road users as a safety finding rather than a nuisance one, and routes it to the faster track a dazzled-driver near miss needs.
Watches complaint records and plant change requests for anything that should trigger a re-assessment, and raises it rather than waiting for the periodic date.
This template lives in KnowEnviro — environment and energy. Aspects, permits, waste, emissions, spills and sustainability reporting.
Meet KnowEnviro→Glossary
Light Pollution Assessment definitions and key terms
- Light spill
- Light that falls outside the area it was intended to illuminate, typically observed at the site boundary or on neighbouring land.
- Glare
- Discomfort or disability caused by excessive brightness in the field of view, distinct from spill in concerning the source's visibility, not its landing point.
- Sky glow
- The brightening of the night sky caused by light directed or reflected upward, the effect most associated with the term light pollution.
- Obtrusive light
- The umbrella term used in ILP-style guidance for spill, glare and sky glow considered together as unwanted effects of exterior lighting.
- Upward light ratio
- The proportion of a fitting's output emitted above the horizontal, the figure most directly linked to its contribution to sky glow.
FAQ
Frequently asked questions about light pollution assessment
What is the light pollution assessment template based on?+
It is built against ISO 14001 clause 6.1.2 for aspect identification, with clause 8.1 covering operational control and clause 9.1.1 the monitoring. Where artificial light is a statutory nuisance, such as the UK, the assessment also serves as evidence, though it is not itself a legal filing.
How many light pollution assessment records should we have?+
One per trigger: a complaint, a permit requirement, a plant or lighting change, the periodic interval, a new installation, or an incident. A stable site with no complaints may hold few records; a site mid-upgrade or fielding complaints will accumulate several in a short period.
Do we need to assess at night?+
Yes. Spill, glare and sky glow cannot be judged from a daytime inspection, only from observing the installation running in the dark, from the boundary or affected viewpoint. A daytime-only assessment can confirm the fittings exist, nothing more.
Does a lighting upgrade need a new assessment even if it is just a lamp swap?+
Yes, whenever output, colour or aiming changes, which a lamp swap usually does even without a fitting change. Brighter or whiter lamps in the same housing, aimed the same way, routinely increase spill and glare.
How is glare towards road users different from glare towards residents?+
Glare towards residents is a nuisance question, addressed through shielding, aiming and timing. Glare towards road users is a safety question, because a dazzled driver is a hazard, and it warrants faster action regardless of whether a resident has also complained.
Can security lighting justify light spill?+
It can justify some, but the assessment should record why a lower-spill option, such as motion-triggered rather than continuous lighting, was or was not used. A security purpose is a reason to have lighting, not a reason to skip assessing what it sends beyond the boundary.
Keep going
Related templates and programmes
Industries this is written for
Programmes this belongs to
Used together in Environmental Management
Legal and Other Requirements Register
Lists every law, regulation, permit and commitment that applies to your operation
Compliance Evaluation Record
Records the periodic evaluation of whether you actually comply with each obligation
Waste Stream Register
Lists every waste stream produced on site, with its classification, container and disposal route
Waste Transfer Record
Records waste leaving site, including type, quantity, carrier and destination
Hazardous Waste Record
Records generation, storage and disposal of hazardous waste
Waste Area Inspection
Checks waste storage areas for correct segregation, labelling, containment and housekeeping
More in Noise and Nuisance
Written and reviewed by
Siddarth Singh
Founder & Chief Executive Officer, Knowella
Certified Safety Professional and industrial and systems engineer with more than a decade inside food supply chain, freight and manufacturing operations. This page was written against the current text of the standards it cites, not against secondary summaries of them.
- Certified Safety Professional (CSP), Board of Certified Safety Professionals
- MBA, University of Chicago Booth School of Business
- MS and BS, The Ohio State University, Industrial and Systems Engineering
- Six Sigma Black Belt
Sources and last review. Reviewed 16 August 2026 against:
- ISO 14001:2015 clauses 6.1.2, 8.1, 9.1.1 and 10.2
- Environmental Protection Act 1990 s.79(1)(fb), as inserted 2005 (UK)
- ILP Guidance Notes for the Reduction of Obtrusive Light (GN01)
- CIE guidance on obtrusive light from outdoor lighting
This page is general guidance, not legal advice. Confirm requirements with your jurisdiction’s regulator.