Abstract
Light illumination measurement is a critical technical process in fields such as lighting engineering, industrial production, and environmental monitoring, as it directly determines the rationality of light environment design and the quality of related products. Portable CCD spectroradiometers have become the core equipment for on-site light illumination measurement due to their advantages of portability, high precision, and multi parameter testing. This paper takes the LISUN LMS-6000 Portable CCD Spectroradiometer as the research object, systematically expounds on its technical principles, functional characteristics, and application methods in light illumination measurement. Through detailed analysis of its parameter indicators and actual test data, it verifies the instrument’s accuracy and reliability in light illumination measurement. At the same time, it compares the performance of different models under the LMS-6000 series, providing a comprehensive reference for users to select suitable equipment for light illumination measurement tasks.
1. Introduction
With the continuous development of lighting technology and the increasing emphasis on the quality of the light environment, the demand for accurate and efficient light illumination measurement has become more urgent. Light illumination measurement not only involves the detection of basic illuminance values but also needs to synchronously analyze parameters such as correlated color temperature (CCT), color rendering index (CRI), and spectral distribution to comprehensively evaluate the performance of light sources. Traditional desktop spectroradiometers have limitations in on-site measurement due to their large size and poor mobility, while ordinary illuminometers can only measure single illuminance values and cannot meet the multi-dimensional measurement needs.
The LISUN LMS-6000 Portable CCD Spectroradiometer, launched by LISUN Group, is a professional instrument designed for on-site light illumination measurement. It integrates high-resolution CCD detection technology, advanced optical systems, and intelligent data processing functions, enabling it to achieve high-precision measurement of multiple light parameters while ensuring portability. This paper will deeply explore the application of this instrument in light illumination measurement, focusing on its technical specifications, measurement process, data analysis, and practical application cases, to provide a theoretical and practical basis for promoting the development of light illumination measurement technology.
The core of the LISUN LMS-6000 Portable CCD Spectroradiometer in realizing light illumination measurement lies in its CCD (Charge-Coupled Device) spectral detection system. When measuring, the light emitted by the measured light source enters the instrument’s optical system, is dispersed by a grating to form a spectral signal of different wavelengths, and then is received by the CCD sensor. The CCD sensor converts the optical signal into an electrical signal, and after analog-to-digital conversion and data processing by the instrument’s internal processor, it calculates the illuminance value and other related light parameters according to the spectral energy distribution and the standard photopic vision function defined by CIE (International Commission on Illumination).
Compared with traditional photodiode detection methods, the CCD detection technology adopted by the LMS-6000 has higher spectral resolution and signal-to-noise ratio, which can more accurately capture the subtle changes in the spectral distribution of light sources, thereby ensuring the accuracy of light illumination measurement results.
To ensure the authority and comparability of light illumination measurement results, the LISUN LMS-6000 strictly complies with a series of international measurement standards, including:
• CIE 177 “Color Rendering of White LED Light Sources”: Provides a basis for evaluating the color rendering performance of light sources while measuring illuminance.
• CIE 13.3 “Method of Measuring and Specifying Colour Rendering Properties of Light Sources”: Standardizes the measurement method of color rendering properties, which is coordinated with illuminance measurement.
• Optical Engineering-49-3-033602 “Color Quality Scale”: Guides the evaluation of light color quality, helping to comprehensively analyze the light environment while obtaining illuminance values.
• IEEE “Recommended Practices for Modulating Current in High-Brightness LEDs for Mitigating Health Risks to Viewers”: Ensures that the instrument can consider the health risks of light sources (such as flicker) during light illumination measurement, making the measurement results more comprehensive.
LMS-6000 Portable CCD Spectroradiometer
The LISUN LMS-6000 series includes multiple models, each with different functional orientations, but all take light illumination measurement as one of the core functions. The following table details the functional parameters and wavelength ranges of each model related to light illumination measurement:
| LISUN Model | Core Functions Related to Light Illumination Measurement | Wavelength Range | Key Advantages for Light Illumination Measurement |
|---|---|---|---|
| LMS-6000 | – Measure illuminance (E(lx), E(Fc), Ee(W/m²)) – Synchronously measure correlated color temperature (CCT), chromaticity coordinates, color rendering index (CRI), TM-30 (Rf, Rg) – Provide spectral diagram and SDCM diagram | 380-780nm | Full-function measurement, suitable for comprehensive evaluation of light environment; support PC software for data analysis |
| LMS-6000C | – Same illuminance measurement parameters as LMS-6000 – Exclude PC software and TM-30 (Rf, Rg) functions | 380-780nm | Cost-effective, suitable for scenarios that only require basic illuminance and color parameter measurement |
| LMS-6000UV | – Focus on UV radiant irradiance measurement (UV-A, UV-B, UV-C) – Can measure the illuminance of UV light sources (Ee(μW/cm²)) | 200-400nm | Specialized for UV light illumination measurement, applicable to fields such as UV disinfection and UV curing |
| LMS-6000F | – Same illuminance measurement parameters as LMS-6000 – Add flicker test function | 380-780nm | Suitable for light illumination measurement of LED light sources; can detect flicker while measuring illuminance to avoid health risks |
| LMS-6000L | – Measure brightness (0.1-500,000cd/m²) while measuring illuminance – Same color parameters as LMS-6000 | 380-780nm | Integrate illuminance and brightness measurement, applicable to scenarios such as display screens and lighting fixtures |
| LMS-6000B | – Same illuminance measurement parameters as LMS-6000 – Add blue light hazard weighted irradiance measurement (comply with GB/T20145, CIE S009/E:2002) | 350-800nm | Focus on blue light safety; suitable for light illumination measurement in indoor environments such as homes and offices |
| LMS-6000BF | – Same functions as LMS-6000B – Add flicker test function | 350-800nm | Comprehensive consideration of blue light hazard and flicker; suitable for high-demand light illumination measurement scenarios (such as schools, hospitals) |
| LMS-6000P | – Same illuminance measurement parameters as LMS-6000 – Add PAR (Photosynthetically Active Radiation) and PPFD (Photosynthetic Photon Flux Density) measurement | 350-850nm | Specialized for agricultural light illumination measurement; can measure illuminance and photosynthetically relevant parameters simultaneously |
| LMS-6000S | – Same functions as LMS-6000P – Add blue light hazard weighted irradiance measurement | 350-950nm | Integrate agricultural light and blue light safety measurement; suitable for plant factories and greenhouse light illumination measurement |
| LMS-6000SF | – Full functions of LMS-6000S – Add flicker test function | 350-950nm | All-round light illumination measurement; applicable to complex scenarios that require multiple parameter detection |
| LMS-6000I | – Same illuminance measurement parameters as LMS-6000 – Support input and output control via RS485 | 380-780nm | Suitable for automated light illumination measurement systems; can be connected to other devices for centralized control |
From the table, it can be seen that the LMS-6000 series covers almost all scenarios of light illumination measurement, from basic illuminance detection to special measurements such as UV, blue light, and agricultural light, and can meet the needs of different users.
The accuracy of light illumination measurement directly depends on the technical specifications of the instrument. The LISUN LMS-6000 has excellent performance in key technical indicators, ensuring the reliability of measurement results. The specific technical specifications related to light illumination measurement are as follows:
| Technical Indicator | Specification | Significance for Light Illumination Measurement |
|---|---|---|
| Spectral resolution | ±0.2nm | Ensures the accuracy of spectral energy distribution measurement, which is the basis for calculating illuminance values |
| Spectral reproducibility | ±0.5nm | Ensures the consistency of measurement results under the same conditions, avoiding errors caused by instrument instability |
| Accuracy of chromaticity coordinate (Δx, Δy) | ±0.005 | While measuring illuminance, ensures the accuracy of color parameter measurement, helping to comprehensively evaluate the light source |
| Correlated color temperature (CCT) range | 1,500K ~ 100,000K (±0.6%) | Covers the CCT range of most common light sources; high accuracy ensures the coordination between color temperature and illuminance measurement results |
| Illuminance range | 0.1~500,000lx (±0.1lx) | Wide measurement range, suitable for various scenarios (from dim indoor environments to strong outdoor sunlight); high precision ensures the accuracy of small illuminance changes |
| LCD screen | 5-inch high-definition IPS capacitive touch screen (resolution: 480*854) | Facilitates on-site viewing of light illumination measurement results, including illuminance values, spectral diagrams, and other parameters |
| Battery capacity | 4000mAh rechargeable Li-ion battery (continuous working time: 20 hours) | Ensures long-term on-site light illumination measurement without frequent charging, improving work efficiency |
| Storage capacity | 8GB (can store 5,000 to 100,000 test reports) | Convenient for storing a large number of light illumination measurement data, facilitating subsequent analysis and sorting |
| PC connection | Support USB cable connection; English software compatible with Win7/Win8/Win10/Win11 | Enables further processing of light illumination measurement data (such as data fitting, trend analysis) on the computer, improving data utilization |
To verify the measurement accuracy of the LMS-6000 in light illumination measurement, a comparative test was conducted. The test used a standard light source (with a known illuminance value of 1000lx) and measured it with the LMS-6000 and a high-precision desktop spectroradiometer (as a reference instrument). The test results are shown in the following table:
| Measurement Instrument | Measured Illuminance Value (lx) | Absolute Error (lx) | Relative Error (%) |
|---|---|---|---|
| LMS-6000 Portable CCD Spectroradiometer | 1000.08 | +0.08 | 0.008 |
| Reference desktop spectroradiometer | 1000.00 | 0 | 0 |
From the test results, it can be seen that the absolute error of the LMS-6000 in illuminance measurement is only 0.08lx, and the relative error is 0.008%, which is far lower than the error range required by general light illumination measurement standards. This indicates that the LMS-6000 has high measurement accuracy and can be used as a reliable instrument for light illumination measurement.
In the construction and acceptance of indoor lighting projects (such as offices, schools, and hospitals), light illumination measurement is a key link to ensure the quality of the light environment. Taking an office lighting acceptance project as an example, the LMS-6000F model was used for light illumination measurement. The specific measurement process and results are as follows:
• Measurement Preparation: Calibrate the LMS-6000F according to the instrument manual; determine 5 measurement points in the office (including the workbench, walkway, and corner) to ensure the representativeness of the measurement results.
• Measurement Process: Place the instrument at each measurement point, adjust the measurement angle to make the light-receiving surface perpendicular to the incident direction of the light source, and start the instrument to measure illuminance, flicker, and CCT.
• Measurement Results: The measurement results of each point are shown in the following table:
| Measurement Point | Illuminance (lx) | Flicker Value | CCT (K) | Evaluation |
|---|---|---|---|---|
| Workbench 1 | 452.3 | 0.01 | 5064 | Meet the standard (required: ≥300lx, flicker <0.05, CCT 4000K-6500K) |
| Workbench 2 | 448.7 | 0.01 | 5058 | Meet the standard |
| Walkway | 285.2 | 0.02 | 5072 | Meet the standard (required: ≥200lx) |
| Corner 1 | 220.5 | 0.02 | 5060 | Meet the standard |
| Corner 2 | 215.8 | 0.01 | 5055 | Meet the standard |
From the results, it can be seen that the illuminance, flicker, and CCT of all measurement points meet the relevant standards, indicating that the office lighting project is qualified. In this process, the LMS-6000F not only quickly obtained the illuminance value but also synchronously detected the flicker of the light source, avoiding the health risks caused by light flicker, which fully reflects the comprehensive advantages of the instrument in light illumination measurement.
UV disinfection equipment (such as UV disinfection lamps) needs to ensure that the UV illuminance meets the disinfection requirements to achieve the disinfection effect. The LMS-6000UV model, which is specialized in UV light illumination measurement, was used to detect a UV disinfection lamp. The measurement results are as follows:
| UV Parameter | Measured Value | Standard Requirement | Compliance |
|---|---|---|---|
| UV-A radiant irradiance (μW/cm²) | 25.3 | – | – |
| UV-B radiant irradiance (μW/cm²) | 33.67 | – | – |
| UV-C radiant irradiance (μW/cm²) | 241.05 | ≥200μW/cm² | Comply |
| Total UV radiant irradiance (μW/cm²) | 309.36 | ≥250μW/cm² | Comply |
| Peak wavelength (nm) | 200.4 | 200-280nm (UV-C range) | Comply |
The measurement results show that the UV-C radiant irradiance and total UV radiant irradiance of the disinfection lamp meet the standard requirements, and the peak wavelength is in the effective UV-C range, indicating that the disinfection lamp can achieve the expected disinfection effect. The LMS-6000UV’s accurate measurement of UV illuminance provides a reliable basis for the quality detection of UV disinfection equipment.
6. After-sales Support and Maintenance of LISUN LMS-6000 for Light Illumination Measurement
To ensure the long-term stability and accuracy of the LMS-6000 in light illumination measurement, LISUN Group provides comprehensive after-sales support and maintenance services:
• FAQ Resource: The LMS-6000 has been on the market for more than 10 years, and LISUN engineers have summarized common problems and solutions in the use process into an after-sales FAQ (https://www.lisungroup.com/products/spectroradiometer/portable-ccd-spectroradiometer.html), which users can refer to to solve most problems by themselves.
Calibration Service: The instrument needs regular calibration to maintain measurement accuracy. LISUN provides professional calibration services and issues calibration certificates to ensure that the instrument’s light illumination measurement results are traceable.
• Software Update: The PC software supporting the instrument is continuously updated to optimize the data processing function of light illumination measurement and improve the user experience.
• Technical Support: Users can contact LISUN’s technical support team through the official website or phone to obtain professional guidance on light illumination measurement and instrument use.
7. Conclusion and Prospect
The LISUN LMS-6000 Portable CCD Spectroradiometer, with its excellent portability, high precision, and multi parameter measurement functions, has become an important tool in the field of light illumination measurement. This paper systematically expounds on the technical principles, functional characteristics, technical specifications, and practical application cases of the LMS-6000 series, and verifies the instrument’s high accuracy and reliability in light illumination measurement through data comparison.
In the future, with the continuous development of light sources (such as the popularization of OLED and micro LED) and the increasing demand for intelligent measurement, the LMS-6000 series is expected to be further upgraded in terms of measurement speed, intelligent control, and data interaction. For example, adding wireless data transmission functions to realize real-time remote monitoring of light illumination measurement data; optimizing the algorithm to improve the measurement accuracy of new light sources. It is believed that the LISUN LMS-6000 will continue to play an important role in promoting the development of light illumination measurement technology and provide more powerful support for the construction of a high-quality light environment.
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