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EN 54-23 Coverage Volume Test with GMS-2000S
GMS-2000S fully automatic VAD light-distribution testing of EN 54-23 coverage volume, also covering GB 26851, ISO 7240-23, UL 1638-2023 and UL 1971. This article defines coverage volume and the Annex A goniophotometric method.
Light-Distribution Curve Test System Procurement Guide
A light-distribution curve test system is a goniophotometer bench that exports IES/LDT/GLDF/SPDX. Hangzhou Yiming Technology GMS-5000 supports .ies/.gldf/.ldt/.xml/.spdx for LM-79; GMS-1920/1680 for 8 m/6 m rooms; GMS-1280 box type; GMS-136 for single-LED distribution.
Integrating Sphere Photometric-Colorimetric-Electrical Test System Procurement Guide
An integrating-sphere photometric-colorimetric-electrical test system measures luminous flux, CCT, CRI and power in one setup. Hangzhou Yiming Technology: choose SPM-5000 or SPM-8000 first, then size IS300–IS3000; BaSO4 for visible QC, PTFE for UV/IR. IES files need a goniophotometer.
LM-79 Wiring Requirements for Electrical Parameter Measurement
Hangzhou Yiming Technology: LM-79-24 Kelvin four-wire external voltage sensing for SSL. Two-wire internal sampling reads U=Ulamp+I×R (lead drop included), so voltage and power are high and efficacy is low—skewing LM-79 energy-efficiency measurement and light-distribution curve testing. Use GMS-5000, GMS-1920 and SPM-5000 under true lamp-head voltage.
GB 26851-2026 Fire Light Alarm: New Optical Requirements, Wall vs Ceiling Limits, Flash Timing and Test Methods
GB 26851-2026 raises quantitative optical bars for fire light alarms: wall-mount effective luminous intensity from 10 cd, ceiling-mount from 5 cd, with installation-specific light distribution (wide horizontal vs 360°), flash about 1–2 Hz, pulse width ≤0.2 s, red/white colour. This article maps clauses to a two-track lab workflow—temporal I_eff metrology plus goniophotometric angular grids per applicable standards—and links LUX-200F, GMS-2000S and VAD test systems for reproducible compliance next to EN 54-23, ISO 7240-23 and UL 1638.
GB30255-2026 Impact Analysis for LED Products: Scope Expansion, Efficiency Thresholds, and Compliance Strategy
GB30255-2026 will take effect on 1 September 2027, replacing GB30255-2019. This update expands product scope to LED high-bay luminaires and replacement double-capped LED lamps, keeps a unified 3-level framework with Level 3 as market-entry threshold, and adds clearer correction and standby-power requirements. This article explains key technical changes and practical compliance actions for manufacturers, brands, and channels.
GB 26851-2026 Published: Effective Luminous Intensity and Upgraded Optical Requirements for Fire Light Alarms
GB 26851-2026 replaces GB 26851-2011 from 1 September 2027. Optical compliance shifts from subjective visibility to quantitative effective luminous intensity I_eff with Annex A measurement: instantaneous illuminance E(t) at 3 m, time-constant integration to E_eff, conversion to I_eff (cd), averaged over flash cycles. Impacts design, type testing and engineering. Yiming Technology flash effective-intensity solution, VAD fire alarm goniophotometer system and LUX-200F flash illuminance meter support reproducible VAD photometry alongside EN 54-23 and related standards.
ANSI/UL1638-2023 Safety Standard for Visual Signaling Appliances for Fire Alarm and Signaling Systems - Standard Requirements and Photometric Coordinate System Implementation
ANSI/UL1638-2023 specifies requirements for Visual Signaling Appliances (VAD) in fire alarm and signaling systems. Key requirement: Minimum effective light intensity percentages at various angles relative to maximum intensity. Typical percentages: 0° (100% reference, maximum intensity), ±15° (≥50% minimum), ±30° (≥25% minimum), ±45° (≥12.5% minimum), ±60° (≥6.25% minimum), ±75° (≥3.125% minimum), ±90° (≥1.5625% minimum). Photometric coordinate system: C-γ system (C=azimuth 0-360°, γ=elevation 0-90°), standard for UL1638 testing. Test method: Goniophotometer measures luminous intensity distribution, effective intensity tester (LUX-200F) measures flashing characteristics, calculate effective intensity per Allard or Modified Allard method. Coverage requirements: Minimum illuminance 0.4 lux at specified distances, full 360° horizontal coverage, vertical coverage typically ±60°. Standard scope: UL1638-2023 applies to visual signaling appliances for fire alarm systems, emergency signaling, building evacuation systems. Test equipment: Goniophotometer for spatial distribution, high-speed photometer for effective intensity. Compliance: UL1638-2023 certification required for US market, equivalent to EN 54-23 for European market. Yiming Technology provides comprehensive UL1638-2023 testing solutions including goniophotometer and effective intensity measurement systems.
CE Certification Requirements for Sound and Light Alarms: Compliance Path Based on EN 54-23 Standard
Sound and Light Alarms (Visual Alarm Devices, VAD) are essential components of fire alarm systems per EN 54 series standards, widely used in commercial, industrial, and residential buildings. CE certification requirements: EN 54-23 (Visual Alarm Devices, effective light intensity, light distribution, coverage area), EN 54-3 (Fire detection and alarm systems - Part 3: Fire alarm devices - Sounders), EN 54-4 (Fire detection and alarm systems - Part 4: Power supply equipment). EN 54-23 key requirements: Minimum effective light intensity (varies by angle, typically 0.4-0.7 cd minimum), light distribution coverage (ensures visibility in designated areas), photometric coordinate system (C-γ or A-α system), test conditions (ambient temperature, voltage variations). Compliance path: (1) Testing per EN 54-23 (effective intensity, light distribution, coverage), (2) Technical documentation (test reports, design drawings, component certificates), (3) EU Declaration of Conformity (DoC), (4) CE marking. Test equipment: Goniophotometer for light distribution measurement, effective intensity tester (LUX-200F) for flashing characteristics. Typical applications: Fire alarm systems, emergency evacuation systems, building safety systems. Yiming Technology provides comprehensive testing solutions for EN 54-23 CE certification.