How often must emergency lighting be tested in the UK?

Under BS 5266-1, emergency lighting must be subject to a monthly function test and an annual full-rated-duration discharge test. The monthly test involves simulating mains failure for a short period (typically 1 minute) to confirm each luminaire illuminates. The annual test discharges the batteries to their full rated duration — 1 hour, 2 hours, or 3 hours depending on the fitting. All results must be recorded in a log book kept on the premises.

Who is responsible for testing emergency lighting?

The responsible person under the Regulatory Reform (Fire Safety) Order 2005 is legally responsible for ensuring emergency lighting is tested and maintained. In most cases this is the employer, building owner, or managing agent. Monthly function tests are often delegated to a member of staff who has been trained in the procedure. Annual full-duration tests should be carried out by a competent electrician familiar with BS 5266-1.

What is the "flick test" for emergency lighting?

The flick test (or monthly function test) is performed by operating the emergency lighting test key or inhibit switch to simulate a mains failure, then checking that every emergency luminaire illuminates. The test should last approximately 1 minute — long enough to confirm illumination but short enough not to significantly discharge the battery. Where a test key is not fitted, the supply circuit breaker can be operated, though this disrupts other circuits and is less ideal.

What happens during an annual emergency lighting test?

The annual test requires the emergency lighting system to be discharged for its full rated duration — typically 3 hours for most commercial premises. During this period, normal lighting in the area must be off to simulate actual emergency conditions, and every luminaire must remain fully illuminated throughout. After the test, the batteries must be given sufficient time to recharge (typically 24 hours) before the building is re-occupied overnight. Results, including any failures, must be logged.

What should I record in the emergency lighting log book?

The BS 5266-1 log book must record: the date of each test; the type of test (monthly function, annual duration, or intermediate); the names and reference numbers of all luminaires tested; the duration of the test; any luminaires that failed to illuminate or failed before the end of the duration; the name and signature of the person conducting the test; and any remedial action taken following a failure. The log book must be kept on the premises and be available for inspection.

What should I do if an emergency luminaire fails its test?

A failed luminaire must be reported immediately to the responsible person and recorded in the log book. If the failed luminaire is on an escape route or covers a mandatory emergency lighting location, it must be repaired or replaced as a matter of urgency — ideally the same day. Until the luminaire is replaced, the responsible person may need to implement compensatory measures such as portable lighting or restricted building occupancy. All remedial action taken must be recorded in the log book.

Can automatic test systems replace manual monthly and annual tests?

Yes. BS 5266-1 recognises automatic test systems as an acceptable means of satisfying the testing requirements. Addressable emergency luminaires with built-in test circuitry can perform function and duration tests automatically and report results to a central monitoring panel. The panel logs all test results electronically, which satisfies the record-keeping requirement. However, the results must still be reviewed by the responsible person and any failures must be actioned promptly.

TESTING GUIDE

Emergency Lighting Testing Guide UK: Monthly & Annual Tests

Everything responsible persons and electricians need to know about emergency lighting testing — legal requirements under BS 5266-1, monthly function tests, annual full-duration discharge tests, log book records, and what to do when a luminaire fails.

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11 min readUpdated 2026-05-18Andrew Moore, Founder of Elec-Mate

Written and reviewed by Andrew Moore, founder of Elec-Mate, against BS 7671:2018+A4:2026, IET Guidance Note 3 and the IET On-Site Guide.

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Key Takeaways

1Emergency lighting testing is a legal requirement under BS 5266-1 and the Regulatory Reform (Fire Safety) Order 2005. The responsible person for any non-domestic premises with emergency lighting must ensure a structured testing programme is in place.
2Monthly function tests require simulating a mains failure (typically for 1 minute using a test key or inhibit switch) to confirm every luminaire illuminates. Results must be recorded immediately.
3Annual full-rated-duration tests require discharging batteries to their full rated duration — 1, 2, or 3 hours depending on the fitting. The test must be performed when the building is unoccupied.
4All test results — including the date, duration, luminaires tested, any failures, and the name of the person conducting the test — must be recorded in a BS 5266-1 compliant log book kept on the premises.
5Any luminaire that fails a test must be repaired or replaced promptly. A failed luminaire on an escape route constitutes a breach of fire safety obligations under the Fire Safety Order.

01 · Testing Guide

Legal Requirement for Emergency Lighting Testing

Emergency lighting testing is not optional — it is a legal requirement for every non-domestic premises with an emergency lighting installation. The legal obligations come from two sources:

Regulatory Reform (Fire Safety) Order 2005 — Article 17 requires the responsible person to ensure fire safety equipment, including emergency lighting, is maintained in efficient working order and good repair. Article 13 requires adequate emergency routes and exits to be equipped with emergency lighting. Failure to comply is a criminal offence carrying unlimited fines and up to two years' imprisonment.
BS 5266-1:2016 — defines the specific testing regime: monthly function tests, annual full-duration tests, and the record-keeping requirements. Compliance with BS 5266-1 is the accepted means of demonstrating compliance with the Fire Safety Order.
Building regulations — Approved Document B (Fire Safety) requires emergency lighting in specified locations. The testing obligations under BS 5266-1 apply from the date of commissioning.

The responsible person is typically the employer, building owner, managing agent, or the person who has control of the premises. In multi-occupancy buildings, responsibility for communal areas usually falls on the building owner or managing agent.

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02 · Testing Guide

Monthly Function Test (The "Flick Test")

The monthly function test — often called the flick test — must be performed every month without fail. Its purpose is to confirm that every emergency luminaire illuminates on simulated mains failure. The test is brief by design: long enough to confirm illumination but short enough not to significantly discharge the battery.

Step 1 — Use the test key or inhibit switch — most modern self-contained luminaires have a keyswitch or push-button that simulates mains failure without operating the main circuit breaker. This is the preferred method as it does not disrupt other equipment or normal lighting.
Step 2 — Duration approximately 1 minute — hold the test for long enough to confirm every luminaire illuminates. Walk the escape route and check each fitting is lit. For large premises, a second person may be needed.
Step 3 — Restore normal supply — release the test key or inhibit switch to restore normal mains supply. The batteries will begin recharging immediately. Do not perform the test when the building is to be vacated overnight unless you are confident the batteries have adequate residual charge.
Step 4 — Record results immediately — note the date, result (pass or fail for each luminaire), and your name in the BS 5266-1 log book. Any failed luminaires must be listed by reference number and location.

Monthly tests are commonly performed by a trained member of staff rather than an electrician. However, the responsible person must ensure the person conducting the test understands what to look for and knows how to record results correctly.

03 · Testing Guide

Annual Full-Duration Discharge Test

The annual test is the most thorough and demanding test in the BS 5266-1 testing programme. It requires the emergency lighting system to operate continuously under simulated emergency conditions for its full rated duration.

Test duration — the test must run for the full rated duration of the fittings: 1 hour, 2 hours, or 3 hours. Installations with mixed duration ratings require each group to be tested for its own rated duration. Most commercial premises specify 3-hour rated fittings.
Building must be unoccupied — the normal lighting must be switched off to simulate true emergency conditions. This makes the emergency lighting the only source of illumination. The test must be performed out of hours when the premises are empty. For 3-hour fittings, start no later than 3 hours before any scheduled overnight occupation.
All luminaires must remain illuminated — any luminaire that fails or extinguishes before the end of the rated duration fails the test. Walk the full escape route at regular intervals during the test to identify early failures. Note the time of any failure, not just that a failure occurred.
Recharge time — after the full-duration test, batteries require a minimum recharge period before returning to full capacity. For most self-contained fittings this is 24 hours. Until fully recharged, the emergency lighting system is degraded. Do not perform the annual test the night before a period of extended overnight occupancy.

04 · Testing Guide

Six-Monthly Intermediate Tests

BS 5266-1 recognises that for some premises — particularly those with 24-hour occupancy such as hospitals, care homes, and hotels — performing an annual full-duration test is impractical or presents an unacceptable safety risk during the recharge period.

Half-duration test — where a full-duration test cannot be carried out, BS 5266-1 permits a test of half the rated duration every six months (e.g., 1.5 hours for a 3-hour system). This is not a substitute for the full-duration test — it is an interim measure where full testing is genuinely impractical.
Full test every three years minimum — even where six-monthly half-duration tests are performed, a full-duration test must be carried out at least every three years to confirm the batteries can genuinely sustain the full rated duration.
Automatic test systems — addressable emergency lighting systems with built-in test functionality can perform full-duration tests during low-risk periods (e.g., 4 AM on a Sunday) automatically, removing the practical difficulty. For continuously occupied premises, automatic systems are strongly recommended.

05 · Testing Guide

Recording Results: The BS 5266-1 Log Book

The log book is the legal record of emergency lighting testing. It must be kept on the premises, be readily available for inspection by the fire authority, and be maintained for the life of the installation.

What to record — date and time of test; type of test (monthly function / annual duration / intermediate); test duration; reference numbers and locations of all luminaires tested; pass/fail result for each luminaire; the time of any failure during a duration test; name and signature of the person conducting the test; any remedial action taken.
Log book format — BS 5266-1 does not prescribe a specific log book format, but pre-printed log books aligned with the standard are available from electrical wholesalers and industry bodies. Digital records are acceptable provided they are backed up and accessible on the premises.
Commissioning certificate — the BS 5266-1 Completion Certificate issued at installation must be stored alongside the log book. This confirms the system was installed in accordance with the standard.
Fire authority inspection — fire safety officers from the local fire and rescue service may inspect the premises at any time. The log book is one of the first documents they will request. An incomplete or missing log book is strong evidence of non-compliance.

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06 · Testing Guide

What to Do if a Luminaire Fails

Luminaire failures are not unusual — batteries degrade over 4–7 years, lamps fail, and electronic control gear develops faults. The important thing is how quickly failures are identified and rectified.

Record the failure immediately — note the luminaire reference, location, and the nature of the failure (failed to illuminate, illuminated briefly then failed, failed after X minutes during the duration test) in the log book.
Assess the risk — a failed luminaire in a storeroom presents a different risk level to one above the main stairway exit. Escape route and exit luminaire failures are critical and must be treated as urgent. The responsible person must be notified immediately.
Implement compensatory measures if needed — if the failed luminaire covers a mandatory escape route location and cannot be replaced immediately, the responsible person may need to restrict building occupancy in the affected area or provide temporary portable lighting as an interim measure.
Replace and re-test — once the luminaire is replaced, perform a function test to confirm it operates correctly. Record the repair date, the nature of the repair, and the re-test result in the log book.

Most self-contained LED luminaires have a battery life of 4–7 years. A system installed for more than 5 years should be assessed for battery replacement — increasing failure rates during annual tests are a clear indication that batteries are nearing end of life.

07 · Testing Guide

Competent Person Requirements

BS 5266-1 requires that emergency lighting systems are tested and maintained by a competent person. The standard does not specify formal qualifications, but competence is assessed against knowledge of the standard, the specific installation, and the equipment in use.

Monthly tests — may be carried out by a trained member of staff who understands the test procedure, knows how to identify failures, and can complete the log book correctly. The responsible person must ensure the person is properly trained.
Annual tests and remedial work — should be carried out by a qualified electrician with knowledge of BS 5266-1. Registration with a competent person scheme (NICEIC, NAPIT, ELECSA) and familiarity with the IET Wiring Regulations is recommended. The ECA and IET publish guidance on emergency lighting competency.
Commissioning certificates — may only be issued by the person responsible for the installation — typically the installing electrician. The certificate must be signed and include the installer's competent person scheme registration details.

08 · Testing Guide

Automatic Test Systems

Addressable emergency lighting systems with built-in automatic test functionality represent the modern approach to BS 5266-1 compliance in larger or more complex buildings. These systems perform all required tests automatically and log results electronically.

Automatic function tests — the system performs monthly function tests at a programmed time, tests each luminaire individually, and logs the result. Failed luminaires are reported to the monitoring panel and can trigger an alert to the responsible person or facilities team.
Automatic duration tests — the system can perform full or half-duration tests at programmed times (typically overnight or at weekends) without manual intervention. This removes the practical difficulty of performing 3-hour tests in 24-hour premises.
Electronic log book — results are stored in the system's memory and can be downloaded or printed on demand. This electronic log satisfies the BS 5266-1 record-keeping requirement provided the data is accessible on the premises.
Reduced maintenance burden — automatic systems significantly reduce the time required for compliance management. The responsible person still needs to review reports and action failures promptly, but the testing itself is handled autonomously.

09 · Testing Guide

For Electricians: Emergency Lighting Testing Contracts

Annual emergency lighting testing and maintenance is recurring contracted revenue that pairs naturally with EICR work, fire alarm servicing, and PAT testing. Every non-domestic premises with emergency lighting requires annual attention — this is a large, stable market.

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Typical Testing Costs (2026)

Annual testing per luminaire: £5–£15 including log book entry. A 30-fitting office installation typically generates £150–£450 per year in testing revenue. Battery replacement (typically needed every 4–7 years): £8–£25 per unit plus labour. A proactive battery replacement programme is an excellent upsell opportunity during annual test visits.

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Emergency Lighting Testing Guide UK: Monthly & Annual Tests

Key Takeaways

Legal Requirement for Emergency Lighting Testing

Get the BS 7671 A4:2026 Cheat Sheet — free

Monthly Function Test (The "Flick Test")

Annual Full-Duration Discharge Test

Six-Monthly Intermediate Tests

Recording Results: The BS 5266-1 Log Book

Record test results hands-free on site

What to Do if a Luminaire Fails

Competent Person Requirements

Automatic Test Systems

For Electricians: Emergency Lighting Testing Contracts

Issue Certificates on Site

Typical Testing Costs (2026)

Manage emergency lighting testing with Elec-Mate

Frequently Asked Questions About Emergency Lighting Testing

How often must emergency lighting be tested in the UK?

Who is responsible for testing emergency lighting?

What is the "flick test" for emergency lighting?

What happens during an annual emergency lighting test?

What should I record in the emergency lighting log book?

What should I do if an emergency luminaire fails its test?

Can automatic test systems replace manual monthly and annual tests?

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