Introduction to Goniophotometry and the LSG-6000 System
Goniophotometry is a critical methodology in photometric and radiometric testing, enabling precise measurement of light distribution, luminous intensity, and spatial radiation patterns. The LISUN LSG-6000 Goniophotometer System represents a state-of-the-art solution for industries requiring high-accuracy optical characterization, including LED and OLED manufacturing, display testing, urban lighting design, and medical lighting equipment validation.
Compliant with IEC, CIE, EN, and ANSI/IESNA standards, the LSG-6000 provides comprehensive data for luminous flux, color uniformity, beam angle, and candela distribution, ensuring compliance with international regulatory frameworks.
Technical Specifications and Measurement Capabilities
The LSG-6000 integrates a dual-axis robotic positioning system with a high-precision spectroradiometer or photodetector, facilitating automated 3D light distribution analysis. Key specifications include:
| Parameter | Specification |
|---|---|
| Measurement Range | 0.1–200,000 cd |
| Angular Resolution | 0.1° (adjustable) |
| Spectral Range | 380–780 nm (extendable) |
| Compliance Standards | IEC 60598-1, CIE 70, IES LM-79, EN 13032-1 |
| Max Sample Dimensions | 2m (diameter) × 1.5m (height) |
| Data Output Formats | IES, LDT, EULUMDAT, CSV |
The system employs Type C (moving detector, fixed lamp) goniophotometry, ensuring minimal measurement uncertainty (±2% for luminous flux, ±1.5% for intensity distribution).
Testing Principles and Methodologies
1. Spatial Light Distribution Analysis
The LSG-6000 captures luminous intensity at incremental azimuth and elevation angles, constructing a 3D candela distribution model. This is essential for:
- LED luminaire optimization (beam shaping, glare reduction)
- Stage lighting design (uniformity, spotlight accuracy)
- Photovoltaic module testing (angular reflectance studies)
2. Luminous Flux Measurement via Integrating Sphere Correlation
While goniophotometers traditionally measure flux via angular integration, the LSG-6000 cross-validates results using auxiliary integrating sphere data, adhering to IES LM-79-19 requirements.
3. Near-Field and Far-Field Characterization
For OLED displays and micro-LED arrays, the system supports near-field goniophotometry (10–50 cm distance) to evaluate pixel-level uniformity, critical for display equipment manufacturers.
Industry Applications and Compliance Standards
1. Lighting Industry and Urban Design
- Standard Compliance: EN 13032-1 (photometric performance), ANSI/IES RP-16 (nomenclature)
- Use Case: Municipalities utilize the LSG-6000 to validate streetlight luminance distribution, ensuring compliance with CIE 140:2019 for glare control.
2. LED and OLED Manufacturing
- Standard Compliance: IES LM-80 (lumen maintenance), IEC 62931 (OLED safety)
- Use Case: Manufacturers employ the system to map angular color shift (MacAdam ellipses) in high-CRI LEDs, reducing batch inconsistencies.
3. Medical and Scientific Lighting
- Standard Compliance: ISO 15004-2 (ophthalmic instruments), DIN 5031-7 (UV radiometry)
- Use Case: Medical device firms validate surgical light homogeneity to meet DIN EN 60601-2-41 requirements.
Competitive Advantages of the LSG-6000
- Multi-Standard Harmonization: Unlike single-standard systems, the LSG-6000 aligns with IEC, ANSI, and CIE simultaneously, reducing re-testing costs.
- Dynamic Sampling Algorithms: Adaptive angular resolution minimizes test duration for high-speed production lines.
- Modular Detector Options: Supports spectroradiometers (for CCT/CRI) and photopic detectors (for fast photometry).
Case Study: Automotive LED Module Validation
A European automotive supplier used the LSG-6000 to certify ADB (Adaptive Driving Beam) headlights per ECE R149. The system identified ±3% intensity deviation at 15° vertical, enabling corrective lens redesign prior to mass production.
FAQ Section
Q1: How does the LSG-6000 handle large luminaires (e.g., stadium lights)?
The system’s 2m diameter turntable and adjustable mounting arms accommodate high-wattage fixtures. Optional extensions support samples up to 3m.
Q2: Is the LSG-6000 compatible with flicker analysis?
Yes, when paired with a high-speed photodetector (1 MHz sampling), it measures % flicker and frequency per IEEE 1789-2015.
Q3: What software interfaces are available?
LISUN provides LISUN ProMetric®, enabling real-time 3D rendering, IES file generation, and automated report exports.
Q4: Can the system test UV or IR emitters?
With optional UV-enhanced (200–400 nm) or IR (700–1100 nm) detectors, the LSG-6000 covers non-visible spectrum applications.
Q5: How does it compare to mirror-based goniophotometers?
The LSG-6000’s direct-measurement robotic arm eliminates mirror reflectance errors, improving accuracy for low-intensity sources (<1 cd).
This technical overview underscores the LSG-6000’s role as a versatile, standards-compliant solution for advanced photometric testing across diverse industries.
