Maintained emergency lighting is illuminated during normal operation and remains available from its emergency power source if the normal lighting supply fails. Non-maintained emergency lighting is normally off and automatically illuminates when the normal lighting supply fails. Neither type is universally better: the correct mode depends on how the premises are used, occupant needs and the emergency-lighting design.
Maintained vs Non-Maintained Emergency Lighting at a Glance
The main difference is what the emergency luminaire does while the normal lighting supply is healthy. GOV.UK fire-safety guidance describes maintained emergency escape lighting as being on during normal conditions, while non-maintained lighting operates when the normal lighting fails.
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How Does Maintained Emergency Lighting Work?
A maintained emergency luminaire provides light while the normal supply is available and remains capable of emergency operation if that supply fails. Depending on the system design, the normal operating state may form part of the everyday lighting or provide continuous visual guidance.
Maintained mode is particularly useful where allowing an area to become dark during normal occupation would be inappropriate. GOV.UK guidance identifies examples such as function rooms, bars and some hotel circulation areas where occupants may be unfamiliar with the layout.
Places where normal lighting may deliberately be reduced, such as certain entertainment or assembly spaces, are another common reason for considering maintained emergency lighting.
Maintained does not mean that every emergency luminaire in a building must remain brightly illuminated in exactly the same way. The design and control arrangement should be appropriate to the premises while preserving the required emergency function.
How Does Non-Maintained Emergency Lighting Work?
A non-maintained emergency luminaire is normally unlit while the normal lighting supply is healthy. If that supply fails, the emergency fitting automatically operates from its emergency power source.
This arrangement is widely suited to workplaces and similar environments where adequate normal artificial lighting is provided whenever people are present. The emergency fitting does not need to contribute to everyday illumination; its role begins when the normal lighting fails.
Non-maintained does not mean inactive or optional. The fitting still needs a suitable emergency supply arrangement and must be capable of operating correctly when required.
Which Type of Emergency Lighting Should You Choose?
The correct choice is based on how the premises and individual areas are actually used. It should not be decided simply by assuming that all offices need non-maintained fittings or that all communal areas need maintained fittings.
Relevant considerations include:
- whether normal lighting remains on whenever the area is occupied;
- whether occupants are likely to be familiar with the escape routes;
- whether normal lighting may deliberately be dimmed or switched off during occupation;
- whether continuous visibility of a route, sign or particular area is needed;
- the building's fire-risk assessment and emergency-lighting design;
- how the emergency system is supplied, controlled and monitored.
One property can therefore contain both maintained and non-maintained luminaires if the design requires different modes in different areas.
Maintained and non-maintained are also only one way of classifying an emergency-lighting system. The wider guide to
the types of emergency lighting systems used in buildings
covers the broader system choices separately.
Does Maintained Lighting Have a Longer Battery Duration?
Not necessarily. Maintained versus non-maintained describes how a luminaire behaves during normal conditions. Rated emergency duration is a separate design characteristic.
GOV.UK guidance notes that emergency escape lighting systems and individual luminaires can be designed for different operating durations following failure of the normal supply. The appropriate duration depends on the premises and the emergency-lighting design.
The separate article on
how long emergency lights should remain on during a power cut
deals with rated duration in more detail.
Do Both Maintained and Non-Maintained Lights Need Testing?
Yes. Both operating modes form part of an emergency-lighting system and need appropriate inspection, testing and maintenance so that their emergency function can be relied upon.
A non-maintained fitting should not be assumed to be satisfactory simply because it remains off during normal use. Its ability to detect failure of the normal lighting supply, transfer to emergency operation and provide the required output still needs to be verified.
Testing frequency and the full operational testing process belong to a separate part of the emergency-lighting topic. The guide to
how often emergency lights should be tested
covers that specific question.
Which Emergency Lighting Standards Are Current in 2026?
The current UK code of practice is BS 5266-1:2025, published by BSI in October 2025. It superseded BS 5266-1:2016 and covers the design, installation and application of emergency lighting in premises.
BS EN 50172:2024 is also current and addresses emergency escape lighting systems, including electrical installation, verification, operation, documentation, testing and maintenance requirements.
These standards should not be treated as interchangeable with legislation. They provide the technical framework used for emergency-lighting design and operation, while legal fire-safety responsibilities arise from the applicable fire-safety regime for the premises.
This is an important update from older emergency-lighting articles that still refer to BS 5266-1:2016 as the current edition. In August 2026, BS 5266-1:2025 is the current BSI edition.
Can an Existing System Be Changed from One Mode to the Other?
A change may be possible, but it should not be treated as a simple preference switch without considering the original design, the luminaire type, wiring and controls, the areas served and the emergency-lighting requirements for the premises.
If an existing installation no longer suits the building layout or use, an
emergency lighting system review
can establish whether fittings should remain maintained, remain non-maintained, be repositioned, replaced or form part of a wider alteration.
References & Standards
Current government guidance and BSI information were used for the operating-mode definitions and standards position in this article.
Unsure Which Emergency Lighting Mode Your Building Needs?
The existing fittings, escape routes, building use and lighting arrangements can be reviewed before deciding whether maintained, non-maintained or a mixed arrangement is appropriate.
Arrange an emergency lighting assessment