Introduction to Goniophotometry and Its Significance

Goniophotometry is a critical photometric measurement technique used to evaluate the spatial distribution of luminous intensity, flux, and color characteristics of light sources. Goniophotometers, the instruments designed for this purpose, enable precise angular measurements of luminous intensity, essential for compliance with international standards and optimizing lighting performance.

The lighting industry, LED/OLED manufacturing, and optical research rely on goniophotometers to ensure product quality, regulatory compliance, and performance validation. This article examines the types of goniophotometers, their testing principles, and the role of the LISUN LSG-6000 in meeting stringent industry requirements.

Types of Goniophotometers and Their Configurations

Goniophotometers are classified based on their mechanical design, measurement capabilities, and application-specific requirements. The primary configurations include:

1. Type C (Moving Detector, Fixed Light Source)

• The detector moves along a spherical or hemispherical path while the light source remains stationary.
• Suitable for measuring directional lighting, such as spotlights and automotive headlamps.
• Compliant with CIE 70, IES LM-79, and EN 13032-1 standards.

2. Type A (Moving Light Source, Fixed Detector)

• The light source rotates while the detector remains fixed.
• Ideal for omnidirectional light sources, including LED bulbs and tubular lamps.
• Adheres to IEC 61341 and ANSI C78.377 for chromaticity and spatial uniformity.

3. Type B (Hybrid Movement System)

• Combines rotation of both the light source and detector for high-precision measurements.
• Used in research laboratories and display testing for advanced angular resolution.
• Meets ISO 19476 and DIN 5032-7 for photometric accuracy.

The LISUN LSG-6000 employs a Type C configuration, optimized for high-speed, high-accuracy measurements in industrial and laboratory settings.

Technical Specifications and Testing Principles of the LSG-6000

The LSG-6000 is a fully automated goniophotometer designed for comprehensive luminous intensity distribution testing. Key specifications include:

Testing Principles

1. Luminous Intensity Distribution Measurement

   • The LSG-6000 captures luminous intensity at varying angles (0° to 360° in horizontal and vertical planes).
   • A spectroradiometer or photometer measures correlated color temperature (CCT) and chromaticity coordinates (CIE 1931/1976).

2. Total Luminous Flux Calculation

   • Integrates angular intensity data to compute total flux (in lumens) per CIE 84-1989.

3. Beam Angle and Zone Flux Analysis

   • Determines beam angles (e.g., 50% and 10% peak intensity points) for directional lighting.
   • Evaluates zonal lumen distribution for uniformity assessments.

Industry Applications and Compliance with International Standards

1. LED & OLED Manufacturing

• Validates spatial color uniformity per ANSI C78.377 and IEC 62612.
• Ensures consistency in automotive LED modules (SAE J575).

2. Display Equipment Testing

• Measures angular luminance and contrast for LCD/OLED screens (IEC 62341-6).

3. Photovoltaic Industry

• Assesses solar simulator angular irradiance homogeneity (IEC 60904-9).

4. Urban Lighting Design

• Evaluates streetlight glare and light trespass per CIE 150:2017.

5. Medical Lighting Equipment

• Certifies surgical lamp beam uniformity (ISO 9680:2014).

Competitive Advantages of the LSG-6000

• High-Speed Automation: Reduces measurement time by 40% compared to manual systems.
• Multi-Standard Compliance: Supports IES, CIE, IEC, and DIN requirements.
• Modular Design: Compatible with spectroradiometers for full spectral analysis.

FAQ Section

Q1: What is the maximum sample size supported by the LSG-6000?
A: The LSG-6000 accommodates samples up to 2m in length and 50kg in weight, with customizable fixtures for irregular shapes.

Q2: How does the LSG-6000 ensure measurement accuracy?
A: It employs a high-precision stepper motor (0.01° repeatability) and temperature-stabilized detectors to minimize drift.

Q3: Which file formats are supported for photometric data export?
A: The system outputs IES, LDT, and CSV formats for compatibility with lighting design software (DIALux, Relux).

Q4: Can the LSG-6000 measure UV or IR light sources?
A: With an optional UV/IR module, it extends spectral coverage from 200nm to 2500nm.

Q5: Is the LSG-6000 compliant with Energy Star requirements?
A: Yes, it meets ENERGY STAR Lamps V2.1 for total flux and chromaticity verification.