A failed emergency light is rarely obvious during a normal working day. The issue only becomes clear when mains power is lost, visibility drops and people need to find a safe way out. Knowing how to test emergency lighting properly helps duty holders identify faults before they affect an evacuation.
Emergency lighting testing should be planned around your premises, occupancy levels and the type of system installed. A small office with self-contained fittings can usually be tested with limited disruption. A school, care setting, warehouse or multi-occupied building may need a more controlled approach, particularly where a test could leave areas temporarily without fully charged backup lighting.
How to test emergency lighting safely
Emergency lighting is designed to operate automatically if normal lighting fails. Testing involves simulating that failure in a controlled way and confirming that escape routes, exits, stairways, changes in level, fire equipment points and other designated areas remain adequately illuminated.
Before starting, identify how your system is tested. Many installations have a local test key switch, while central battery systems may be controlled from a panel. Some newer systems use automatic testing and report faults electronically. Do not simply switch off circuits at the distribution board unless this is the approved testing method and you understand what else may be affected.
Tell relevant staff, security personnel and occupants that a test is taking place. This is particularly important where lighting levels affect patient care, teaching, manufacturing, access control or safe movement around the site. Choose a time when the test will cause the least disruption, but do not postpone essential checks indefinitely because the building is busy.
Before simulating a power failure, carry out a brief visual inspection. Check that emergency luminaires and illuminated exit signs are present, clean, unobstructed and not damaged. Look for charging indicators that are not lit, flickering LEDs, loose fittings and recently altered areas where the original escape route may no longer be suitable.
When the test facility is activated, normal lighting should be treated as unavailable in the relevant area. Confirm that the emergency fittings illuminate promptly and that the direction of travel to final exits remains clear. It is not enough for one or two fittings to operate. The test should consider the whole escape route, including corridors, staircases, external escape paths where provided, doorways, changes in direction and fire alarm call point locations.
Once the test is complete, restore the normal supply and check that charging resumes. Most battery-backed fittings need time to recharge fully before they can deliver their rated emergency duration again. Repeatedly testing the same fitting for long periods can reduce its available backup time when it is genuinely needed.
Monthly functional tests
A monthly functional test is normally a short simulated mains failure. Its purpose is to confirm that emergency luminaires, exit signs and indicators operate when called upon, without significantly discharging the batteries.
For many self-contained systems, the test is carried out using the designated key switch for a short period, commonly around 30 seconds. During this time, inspect the relevant areas and identify any fitting that fails to illuminate, emits insufficient light, shows damage or has an unlit fault indicator.
The precise duration and method should follow the manufacturer instructions, the system design and your fire risk assessment. Automated systems can reduce the practical burden, but they still require someone to review the reported status and ensure faults are acted upon. An automated test report is useful only when it leads to a timely repair.
Routine checks should also account for changes within the building. New racking, partitions, furniture, displays or stored materials can obstruct light or make an exit sign difficult to see. A system that was compliant at installation may no longer adequately support the way a premises is used.
Annual full-duration tests
The annual test is more demanding because it checks whether the system can operate for its full rated duration. In many commercial premises this is three hours, although the required duration depends on the risk assessment, building use and system specification.
A full-duration discharge test should be scheduled carefully. At the end of the test, emergency lights will have depleted their batteries and will need a recharge period. If the building remains occupied or could be used before the batteries have recovered, suitable temporary precautions may be required.
During the annual test, confirm that emergency lighting remains operational for the required period and still provides usable illumination at the end of that period, not merely at the start. Walk the escape routes where safe to do so. Check that exit signs remain visible, stairs can be negotiated safely and designated open areas do not become dangerously dark.
This is also a sensible opportunity to inspect the wider condition of the installation. Ageing batteries, discoloured diffusers, damaged signs and fittings affected by building works can all undermine performance. A fitting may illuminate during a short monthly test yet fail before the end of a full-duration discharge.
For larger, complex or higher-risk sites, annual testing is often best undertaken by a competent fire safety professional. Central battery systems, maintained lighting arrangements, large estates and premises with vulnerable occupants require particular care. The test must protect compliance without creating a new avoidable risk for people on site.
What should be recorded in the emergency lighting logbook?
A test is not complete until it has been recorded. Your emergency lighting logbook provides evidence that checks have taken place and creates a clear record of faults, repairs and recurring issues. It is also valuable during audits, fire risk assessment reviews and inspections by enforcing authorities.
Each entry should state the date and time of the test, the type of test completed, the areas or fittings checked, the test duration, any defects found and the action taken. Record who carried out the test and when normal charging was restored. For annual tests, note whether the system achieved its full rated duration.
Keep repair records with the logbook. If a failed fitting is replaced, the record should show when the defect was identified, how the area was managed in the meantime and when the repair was completed. This demonstrates that faults were not simply noted and left unresolved.
Common faults found during testing
Battery failure is one of the most common reasons for poor emergency-lighting performance. Batteries deteriorate over time and may no longer hold sufficient charge, even if the fitting appears normal during day-to-day operation. Lamps, LED drivers and charging components can also fail.
Physical changes to a premises are another frequent problem. A sign may be hidden behind stock, a fitting may be painted over during refurbishment, or a new partition may leave part of an escape route in shadow. In leased or multi-occupied buildings, responsibility can become unclear between the landlord and tenant, but the people responsible for an area still need confidence that occupants can escape safely.
Fault indicators should never be ignored. A red, flashing or extinguished status light does not always identify the exact component at fault, but it is a clear reason to investigate. Replacing a lamp without checking the battery, charging circuit and operation time may only deal with part of the issue.
Assign clear responsibility and act on defects
The responsible person should make sure emergency lighting is included in the site fire safety arrangements, alongside fire alarm checks, extinguisher servicing and fire door inspections. In England and Wales, this supports duties under the Regulatory Reform (Fire Safety) Order 2005. Similar fire safety duties apply elsewhere in the UK, and recognised guidance such as BS 5266 supports a structured approach to emergency lighting provision and maintenance.
A trained member of staff can often carry out routine checks on straightforward systems, provided they understand the site, test method and recording requirements. However, installation defects, recurring failures, full-duration concerns and complex systems should be referred to a competent engineer. The aim is not simply to complete a checklist, but to ensure the lighting will perform when normal power is unavailable.
Janus Safety Solutions can support businesses with practical, low-disruption fire safety compliance services, helping duty holders coordinate essential checks and address issues before they become a greater risk.
Emergency lighting earns its value in a moment no one can predict. A planned testing routine, accurate records and prompt repairs give staff, visitors and residents a safer route out when they need it most.