Research on Application of Portable Spectrometer in Precision Detection of Photometric and Colorimetric Parameters

Introduction

With the rapid popularization of LED lighting, plant lighting, healthy lighting, film and television lighting as well as smart luminaires, the spectral consistency, color rendering performance, illuminance uniformity and spectral distribution of light sources directly affect lighting quality, visual comfort and human health. Traditional laboratory spectrometers feature large size, complex wiring and requirements for constant temperature environment, which cannot meet the demands of rapid on-site detection. Featuring compact structure, simple operation, comprehensive testing functions and intuitive data display, the portable spectrometer has become the preferred device for on-site photometric and colorimetric evaluation.

LISUN LMS-6000 handheld colorimeter adopts long-focus crossed asymmetric CT spectroscopic system and high-sensitivity CCD array. It can complete all-dimensional photometric and colorimetric parameter measurement in one stop, including illuminance, correlated color temperature, color rendering index, TM-30, chromaticity coordinates, peak wavelength and spectrogram. It is widely applied in factory inspection of luminaires, acceptance of lighting projects, certification of eye-care lamps and evaluation of plant illumination . This paper conducts research on this portable spectrometer and demonstrates its core value in the modern photometric and colorimetric detection system.

Core Functions and Measurable Parameters of Portable Spectrometer

Based on optical spectroscopy, photoelectric detection and intelligent algorithms, the portable spectrometer converts complex spectral signals into intuitive values and graphs to realize one-stop detection of full parameters. The measurable key indicators of LISUN LMS-6000 handheld colorimeter are listed as follows:
• Photometric parameters: Illuminance (0.1–500,000 lx, accuracy ±0.1 lx), foot-candle E(Fc), irradiance Ee (W/m²), supporting high-precision measurement from low light to strong light across the full range.
• Colorimetric and temperature parameters: Color temperature Tc (K), Duv (black body locus deviation), correlated color temperature (CCT), chromaticity coordinates, total color difference, luminance difference, red-green chroma, yellow-blue chroma, correlated color temperature difference and color tolerance graph, which fully characterize color quality.
• Color rendering and color quality: Color Rendering Index (CRI, Ra and R1–R15), TM-30 (Rg, Rf), which scientifically evaluate the color reproduction capability of light sources for objects.
• Spectral characteristic parameters: Peak wavelength, dominant wavelength, full width at half maximum, centroid wavelength, central wavelength and color purity, which accurately describe spectral distribution characteristics.
• Visual output: Real-time spectrogram, chromaticity diagram and color tolerance graph. The test results are presented intuitively to facilitate rapid judgment and report generation.

The above parameters cover all performance indicators of lighting products. The portable spectrometer can complete comprehensive evaluation from basic photometric indicators to advanced color quality on site, greatly improving detection efficiency and data reliability.

Figure: PPFD Meter

Model and Configuration Comparison of LISUN LMS-6000 Handheld Colorimeter

To adapt to diverse testing requirements, LISUN LMS-6000 portable spectrometer is available in multiple professional versions. The table below compares the core models, functions and wavelength ranges:

Adopting modular design, this series of portable spectrometers realizes multi-purpose application with one device. Users can select basic version, UV version, flicker test version, blue light hazard version or plant lighting version according to actual scenarios, balancing universality and professionalism.

Technical Advantages and Performance Indicators of Portable Spectrometer

LISUN LMS-6000 handheld colorimeter adopts advanced optical and electronic control design to ensure high precision and stability for on-site detection:
• Optical System: Equipped with long-focus crossed asymmetric CT spectroscopic system, stray light is less than 0.015% (600 nm) and less than 0.03% (435 nm), which reduces interference and improves measurement accuracy.
• Wavelength and Colorimetric Accuracy: Wavelength accuracy ±0.5 nm, resolution ±0.2 nm; chromaticity coordinate accuracy Δx/Δy ±0.005; color temperature accuracy ±0.6%, meeting the calibration requirements of laboratory-grade instruments.
• Measurement Range: Illuminance 0.1–500,000 lx, color rendering index 0–100.0, integration time 0.1 ms–5 s, suitable for all scenarios from weak light to high-intensity light sources.
• Human-machine Interaction and Battery Life: Equipped with a 5-inch high-definition IPS capacitive touch screen. The 4000 mAh lithium battery supports up to 20 hours of continuous operation. The dimension is 135 mm×80 mm×23 mm, portable for single-hand operation.
• Data Storage and Compatibility: Built-in 8 GB large-capacity storage, capable of storing 5,000 to 100,000 test reports. It supports PC software compatible with Windows 7/8/10/11 for convenient data export, analysis and filing.

Integrating laboratory-grade precision into a handheld device, the portable spectrometer realizes rapid, stable and repeatable on-site detection, solving the pain points of traditional equipment such as poor mobility, low testing speed and high usage cost.

Applicable Standards and Test Procedures of Portable Spectrometer

Applicable Standards

LISUN LMS-6000 handheld colorimeter strictly complies with domestic and international authoritative standards to ensure mutual recognition of test results:
• CIE 13.3, Method of Measuring and Specifying Colour Rendering Properties of Light Sources
• CIE 177, Colour Rendering of White LED Light Sources
• Optical Engineering-49-3-033602, Color Quality Scale
• IEEE Recommended Practice for Flicker Assessment of High-brightness LED
• GB/T 20145, CIE S009/E:2002 (Applicable to blue light hazard version)

Standard Test Procedures
• Power-on Calibration: The device completes automatic dark calibration and optical calibration to ensure stable baseline.
• Parameter Setting: Select test modes including general lighting, plant lighting, flicker test and blue light hazard test.
• On-site Measurement: Aim the probe at the light source and start the test with one click. All parameters can be obtained within 1 second.
• Data Checking: Real-time display of illuminance, CCT, CRI, TM-30, spectrogram and other data on the screen.
• Record and Export: Save data and export reports for quality inspection, certification or project acceptance.

The portable spectrometer simplifies operation procedures. Operators can conduct standard detection after simple training.

Application Scenarios and Practical Value of Portable Spectrometer

Luminaire R&D and Quality Control: Quickly screen light sources, evaluate color rendering and color temperature consistency, optimize spectral formula and improve product qualification rate. Actual tests show that the defective rate related to color rendering index can be reduced by more than 50% with the portable spectrometer.
• Lighting Project Acceptance: On-site detection of illuminance uniformity, color temperature deviation, color tolerance and flicker, to judge whether the products meet design and specification requirements and avoid low-quality lighting.
• Health and Eye-care Lighting: Evaluate blue light hazard, flicker depth and color temperature comfort, providing scientific data support for lamps used in classrooms, hospitals and households.
• Plant Lighting Detection: LMS-6000P/S versions measure PAR, PPFD and the ratio of red and blue light, guiding the optimization of light environment in greenhouses, tissue culture rooms and plant factories to improve photosynthetic efficiency.
• Film, Television and Commercial Lighting: Ensure authentic color reproduction of light sources and prevent image distortion and commodity visual deviation caused by color shift.
• Certification and Testing Institutions: The portable spectrometer meets the requirements of on-site sampling inspection, mobile calibration and rapid report issuance, improving service efficiency and coverage.

The portable spectrometer has become essential equipment for the whole lighting industry chain, realizing full-process quality control from R&D, production and engineering to terminal application.

Conclusion

With the advantages of portability, high speed, comprehensive functions and high precision, the portable spectrometer has reconstructed the modern photometric and colorimetric detection system, and serves as key equipment for the high-quality development of lighting industry. Featuring full coverage of photometric and colorimetric parameters, compliance with multiple industrial standards and adaptability to various scenarios, LISUN LMS-6000 handheld colorimeter has become an industry benchmark with stable performance and professional configuration.

In the future, portable spectrometers will develop towards higher precision, faster testing speed, composite multi-environment detection (temperature & humidity + spectrum + flicker + blue light hazard), AI intelligent judgment and wireless cloud transmission, further lowering the operation threshold and improving detection efficiency. With the continuous upgrading of healthy lighting, plant lighting and smart lighting, portable spectrometers will play an irreplaceable role in more fields and promote the continuous improvement of ambient light quality.