Visual alarm devices - their effectiveness in warning of fire
Research by BRE looked at the effectiveness of visual alarm devices in warning building occupants of fire.
The research compared the responses of a group of participants to flashing Xenon and LED devices of varying pulse durations. One Xenon device, three cool white LED devices (of 40, 20 and 10 millisecond (ms) pulse durations) and two warm white LED devices (of 40 and 20ms pulse durations) were used.
The flashing signals were presented individually to 96 participants who were seated in front of a screen and occupied with a written task. The tests were performed in high and low ambient light level conditions. The devices were flashed one at a time, and from a distance of 19m were gradually brought closer to the screen until the subjects responded. The response data was processed to identify the effective illumination levels required to alert people to the flashing signals from the six devices.
Analysis of this data revealed that as the pulse durations of LED devices shorten, the attention drawing effectiveness increases. It also demonstrated no significant difference in responses between warm white LED devices and cool white LED devices. The Xenon and 10ms cool white LED device had similar responses; however, a cool white LED device with a pulse duration of 5ms may out-perform a Xenon device.
Find out more and see the full project report on the BRE Group website.
[edit] Related articles on Designing Buildings Wiki
- Automatic fire detection and alarm systems, an introductory guide to components and systems BR 510.
- Carbon monoxide detector.
- Combustion appliance.
- Evacuating vulnerable and dependent people from buildings in an emergency FB 52.
- Fire and rescue service.
- Fire dampers.
- Fire detection and alarm system.
- Fire detector.
- Fire performance of external thermal insulation for walls of multistorey buildings, third edition (BR 135).
- Fire protection engineering.
- Fire safety design.
- Fire.
- Heat alarm.
- Intelligent building management systems IBMS.
- Ionisation smoke alarms.
- Optical smoke alarm.
- Personal protection watermist systems in the homes of vulnerable people.
- Smoke detector.
- The causes of false fire alarms in buildings.
- Understanding the factors affecting flashover of a fire in modern buildings.
- Visual alarm devices for fire: An introduction and guide to BS EN 54-23.
Featured articles and news
RTPI leader to become new CIOB Chief Executive Officer
Dr Victoria Hills MRTPI, FICE to take over after Caroline Gumble’s departure.
Social and affordable housing, a long term plan for delivery
The “Delivering a Decade of Renewal for Social and Affordable Housing” strategy sets out future path.
A change to adoptive architecture
Effects of global weather warming on architectural detailing, material choice and human interaction.
The proposed publicly owned and backed subsidiary of Homes England, to facilitate new homes.
How big is the problem and what can we do to mitigate the effects?
Overheating guidance and tools for building designers
A number of cool guides to help with the heat.
The UK's Modern Industrial Strategy: A 10 year plan
Previous consultation criticism, current key elements and general support with some persisting reservations.
Building Safety Regulator reforms
New roles, new staff and a new fast track service pave the way for a single construction regulator.
Architectural Technologist CPDs and Communications
CIAT CPD… and how you can do it!
Cooling centres and cool spaces
Managing extreme heat in cities by directing the public to places for heat stress relief and water sources.
Winter gardens: A brief history and warm variations
Extending the season with glass in different forms and terms.
Restoring Great Yarmouth's Winter Gardens
Transforming one of the least sustainable constructions imaginable.
Construction Skills Mission Board launch sector drive
Newly formed government and industry collaboration set strategy for recruiting an additional 100,000 construction workers a year.
New Architects Code comes into effect in September 2025
ARB Architects Code of Conduct and Practice available with ongoing consultation regarding guidance.
Welsh Skills Body (Medr) launches ambitious plan
The new skills body brings together funding and regulation of tertiary education and research for the devolved nation.
Paul Gandy FCIOB announced as next CIOB President
Former Tilbury Douglas CEO takes helm.
UK Infrastructure: A 10 Year Strategy. In brief with reactions
With the National Infrastructure and Service Transformation Authority (NISTA).