1. Light intensity and brightness measurement
Light intensity is the primary indicator for evaluating the performance of lighting equipment. In order to accurately measure the light intensity of LED tunnel lights, a professional lux meter is usually used. In practical applications, multi-point measurements are required at different locations, heights and distances in the tunnel to obtain comprehensive data. These measurement points should cover key areas such as the entrance, interior, turns and exit of the tunnel. According to the International Commission on Illumination (CIE) and local traffic lighting standards, the illumination requirement inside the tunnel is usually 100 to 200 Lux. By comparing the measured illumination value with the design standard, it can be determined whether the lighting of the lamp is sufficient. At the same time, attention should also be paid to the changes in lighting, and dynamic monitoring should be carried out at different locations and time periods in the tunnel (such as day and night) to ensure the stability and adaptability of lighting in actual use. If it is found that the illumination in some areas is significantly lower than the standard, it may be necessary to adjust the number or type of lamps, or redesign the layout of the lamps to ensure that the lighting intensity of the entire tunnel meets the specified requirements.

2. Uniformity analysis
Light uniformity refers to the uniformity of light distribution inside the tunnel. In order to evaluate the uniformity of illumination, the uniformity ratio is usually used to quantify this indicator. The calculation method is to use the ratio of the minimum illumination to the average illumination in the tunnel. The ideal uniformity ratio should be close to 1, which means that the illumination distribution is uniform and there are no obvious shadows or bright spots. In specific implementation, illumination tests can be carried out at multiple measurement points in the tunnel, and the data can be collected and analyzed. If the uniformity ratio is lower than 0.4, this may cause visual errors during driving and increase the risk of accidents. Therefore, in the selection and layout design of lamps, the distribution characteristics of the light source should be given priority, such as the selection of wide-angle lamps to increase the coverage of illumination. It is also possible to use illumination simulation software to predict in advance the impact of different lamp layouts on illumination uniformity, so as to optimize the design scheme and ensure that the illumination quality in the entire tunnel meets the expected uniformity standard.

3. Light color temperature and color rendering
The color temperature of LED tunnel lights is usually between 4000K and 6000K. Choosing a suitable color temperature can not only improve the driver's visual recognition ability, but also affect the overall atmosphere of the tunnel. Light sources with higher color temperatures (such as 5000K to 6000K) are usually closer to natural light, which helps improve drivers' alertness and reaction speed. When evaluating light quality, the color rendering index (CRI) is also an important consideration. CRI reflects the ability of the lamp to restore the color of objects, and usually requires a CRI value of 80 or above to ensure that the colors in the tunnel are realistic and easy to identify. The color rendering of the lamp directly affects the driver's recognition of road signs, traffic signals and other important visual information under different lighting conditions. When purchasing LED tunnel lights, it is necessary not only to pay attention to its luminous flux and energy efficiency, but also to pay attention to the selection of color temperature and CRI value to improve the overall lighting quality and safety of the tunnel. The light decay and color rendering ability of the lamp should be monitored regularly to ensure that the lamp is always in the best working condition to cope with performance changes caused by long-term use.

4. Glare evaluation
Glare is an important factor affecting visual comfort, which may cause significant interference to drivers and even affect traffic safety. In order to evaluate the glare level of LED tunnel lights, the Unified Glare Rating (UGR) can be used as a quantitative standard. The higher the UGR value, the more severe the glare. The ideal UGR value should be less than 19, especially in tunnels with dense traffic or high speed. When evaluating glare, factors such as the installation height of the lamp, the type of light source, and the projection direction of the light beam need to be considered. A well-designed lamp layout can effectively reduce glare, for example, using reflective lamps or adjusting the installation angle of the light source. Shading devices or lamp covers can also be used to reduce the impact of direct glare. When evaluating glare, it is recommended to monitor the lamp at the beginning of use and retest it after a period of use to detect the decline or unevenness of the lamp performance, and adjust the lighting plan in time to ensure that the visual environment of the tunnel is always comfortable and safe.

5. Beam angle and coverage
Beam angle and lighting coverage are important factors affecting the uniformity and quality of lighting. When designing LED tunnel lights, it is necessary to select an appropriate beam angle to ensure that the light can cover the entire tunnel area and avoid shadows or dark areas. For special environments such as tunnels, it is usually recommended to use lamps with larger beam angles to provide more uniform light distribution. At the same time, the appropriate lamp installation height and spacing should be selected according to the height, width and length of the tunnel to optimize the lighting effect. When installing, the spacing between lamps should take into account the attenuation and diffusion characteristics of light to ensure that the required illumination can be achieved at all locations in the tunnel. As the luminous flux of LED lamps increases over time, this should be taken into account when selecting and designing lamps to ensure that good lighting effects are maintained even after the lamps age. For new tunnels, lighting simulation software can be used to predict the impact of different configurations on the lighting coverage, so as to achieve accuracy and efficiency in the design stage.

6. Data Analysis and Simulation
Before the installation of lamps, using professional software for lighting simulation is an important step in evaluating the performance of LED tunnel lights. Through simulation, the performance of lamps under different conditions, including light intensity, uniformity, glare, etc., can be predicted. This method can help designers identify potential problems in advance and optimize design solutions. In the actual simulation process, factors such as the geometric characteristics of the tunnel, the surrounding environment, the characteristics of the light source, and the expected traffic flow should be considered to generate a more accurate illumination distribution map. The simulation results can not only provide a basis for the selection of lamps, but also provide guidance for the installation layout of lamps. Data analysis can be verified in combination with on-site measurement data to ensure the accuracy of the simulation results. By continuously adjusting the simulation parameters, the lighting design can be optimized to ensure that the quality and uniformity of illumination in the tunnel are optimal. The application of such technology not only improves the design efficiency, but also reduces the cost of later maintenance and adjustment, providing a guarantee for the long-term use of the tunnel.

7. On-site testing and feedback
On-site testing is a key link in evaluating the quality and uniformity of LED tunnel lighting. After the lamps are installed, field measurements should be carried out under different time and climate conditions, and the illuminance values ​​of each measuring point in the tunnel should be recorded for analysis. On-site testing can not only verify whether the lighting performance of the lamps meets the design requirements, but also evaluate the brightness changes and uniformity in actual use. During the test, special attention should be paid to the tunnel entrances and turns, which have higher requirements for illumination. Obtaining feedback from drivers is also an important part of the evaluation. The actual user experience can provide an intuitive basis for the adjustment of lamps. Through regular on-site testing and feedback collection, the lighting scheme can be continuously optimized to ensure that the lighting effect is always optimal. For lamps that perform poorly, they should be adjusted or replaced in time to ensure the overall lighting effect and safety of the tunnel. Such a feedback loop can not only improve the quality of tunnel lighting, but also provide designers with valuable experience in future projects.