VAD Fire Alarm Effective Intensity & Light Distribution Testing
Fire VADs require effective intensity I_eff and C-x-y/W-x-y coverage volume. GMS-2000S with LUX-200F forms a dual-track spatial + temporal photometry chain covering GB 26851, EN 54-23, UL 1638 and related standards.
Definition & Scope
A Visual Alarm Device (VAD) provides flashing visual signals in fire alarm systems. Compliance testing combines two tracks: a goniophotometer (e.g. GMS-2000S A-α) scans spatial intensity to compute C-x-y or W-x-y coverage volume against minimum illuminance (typically 0.4 lx), and a flash illuminance meter (e.g. LUX-200F) captures E(t) at a fixed distance, integrating to effective intensity I_eff via Blondel-Rey-Douglas, Allard or related methods. GB 26851-2026, EN 54-23, ISO 7240-23, UL 1638-2023 and UL 1971 align on this spatial + temporal photometry workflow for unified domestic and export test platforms.
FAQ
What is the difference between coverage volume and effective intensity in VAD testing?
Which VAD standards does GMS-2000S cover?
What does GB 26851-2026 require for effective intensity?
How should a VAD test system be configured?
Key Articles
- EN 54-23 Coverage Volume Test with GMS-2000S
- GB 26851-2026 Fire Light Alarm: New Optical Requirements, Wall vs Ceiling Limits, Flash Timing and Test Methods
- GB 26851-2026 Published: Effective Luminous Intensity and Upgraded Optical Requirements for Fire Light Alarms
- BS EN 54-23:2010 Fire Detection and Fire Alarm Systems - Part 23: Visual Alarm Devices (VAD) - Standard Requirements and Photometric Coordinate System Implementation
- CE Certification Requirements for Sound and Light Alarms: Compliance Path Based on EN 54-23 Standard
- ANSI/UL1638-2023 Safety Standard for Visual Signaling Appliances for Fire Alarm and Signaling Systems - Standard Requirements and Photometric Coordinate System Implementation
Related Products
Related Solutions
- VAD Fire Alarm Sound and Light Signal Effective Intensity and Light Distribution Test System
VAD fire alarm effective intensity and light distribution test system; GMS-2020A for VAD photometric performance; C-x-y/W-x-y coverage volume measurement; compliant with GB26851, ANSI/UL1638-2023, AS-ISO-7240.23-2014, BS EN 54-23-2010
- Flash Light Source Effective Luminous Intensity Test Solution
Widely used for effective luminous intensity measurement of traffic warning lights, aviation obstacle lights, aircraft anti-collision lights, navigation lights; also for transient photometry of flares, signal flares, pulse LEDs, explosives and other pulse light sources