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How to Measure Semi-Cylindrical Illuminance On Site: LUX-100D-C vs LUX-100D-F
Field Esc measurement: 1.5 m height, orientation, tripod leveling, and when to choose LUX-100D-C (semi-cylindrical) vs LUX-100D-F (full cylindrical).
Calibrating Semi-Cylindrical Illuminance Meters on an Optical Bench
Optical-bench calibration of Esc meters: Esc = (2/π)·I/l², reference plane at ~0.067×d, stray-light control, and expanded uncertainty typically within ~1–1.3% (k=2).
Semi-Cylindrical Illuminance in CJJ 45, JGJ/T 163 and GB/T 50034
How CJJ 45-2015, JGJ/T 163-2008 and GB/T 50034—2024 define Esc evaluation metrics and example limit values for pedestrian and outdoor public lighting.
What Is Semi-Cylindrical Illuminance (Esc)?
Esc vs horizontal and full cylindrical illuminance: definitions, use cases for facial recognition and spatial modeling, and when to pick which meter.
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-200D-F, GMS-2000S and VAD test systems for reproducible compliance next to EN 54-23, ISO 7240-23 and UL 1638.