BS 5266 categories: escape, standby, high-risk
Led Lighting · Lesson 11 · Intermediate
Purpose
Classify emergency escape, local-area/high-risk and standby lighting under the current premises risk strategy.
Learning objectives
- Define the design boundary
- Use current product/project evidence
- Calculate with stated assumptions
- Verify maintained and failure performance
BS 5266-1:2025 expands guidance beyond escape to local area and standby lighting. Categories describe different objectives and cannot be selected from room name alone.
Core theory
Emergency escape lighting covers escape routes, open areas/anti-panic needs and high-risk task areas as applicable, including safety signs, call points and firefighting equipment.
Local-area lighting supports specific vital actions or occupants remaining in place; standby lighting supports continuation of normal activities and may require normal-lighting quality.
Use fire/risk assessment, occupant familiarity/mobility, hazards, building systems, duration and failure scenarios. One luminaire may contribute to several needs only with verified performance.
| Term | Meaning | Symbol | Unit |
|---|---|---|---|
| Emergency escape lighting | Lighting enabling safe exit and safety equipment use | Not applicable | Not applicable |
| Local-area lighting | Emergency illumination for defined locations/actions | Not applicable | Not applicable |
| Standby lighting | Lighting enabling normal activities to continue | Not applicable | Not applicable |
Assumptions: Supplied values are fictional design inputs; Exact current standards and photometric/product data remain governing.
- Escape: Provide the required escape-route system independently.
- Task: Assess high-risk/local-area lighting at controls and hazards for shutdown.
- Duration: Verify output and duration through the full safe shutdown plus escape strategy.
The design needs task/local-area evidence as well as escape lighting; generic corridor coverage is insufficient.
Reasonableness check: The answer distinguishes average screening from point, uniformity, glare, emergency and maintained-performance requirements.
- Treating standby lighting as identical to escape lighting
- Using initial lumens without utilization or maintenance losses
- Selecting color quality or glare from one headline number
Where this appears in practice
Complete lighting design coordinates visual task, occupants, fire strategy, photometry, emergency modes, controls, energy, maintenance and verification.
Knowledge check
Is standby lighting automatically emergency escape lighting?
No. Objectives and performance criteria differ.
Answer: No. Objectives and performance criteria differ.
Practical exercise
Classify a hospital, warehouse process, office and place-of-assembly failure scenario.
Summary
- Emergency category follows risk and activity
- Average lux is only one design metric
- Controls must fail to a documented safe/useful state
Sources and review
- BS 5266-1:2025: Emergency lighting code of practice: BSI; 2025; United Kingdom
- SLL Code for Lighting: CIBSE / Society of Light and Lighting; Current edition and application guidance must be confirmed; United Kingdom
- CIE position statement on colour quality metrics: CIE; Second edition, 2025; International
- DALI-2 and DALI Emergency certification: DALI Alliance; Current product database/status must be checked; International
Editorial review date: 2026-08-22. Professional electrical review is pending.