Temperature and Humidity Control Cabinet: Environmental Adaptability Verification Technology and Application in the LED Industry

Abstract
This paper focuses on the LISUN GDJS-015B Temperature and Humidity Control Cabinet, systematically expounding its technical principles, core performance parameters and industrial application value. As a device specially developed for environmental adaptability and reliability verification of materials and products, it accurately simulates multiple climatic scenarios such as “low-temperature resistance, high-temperature heat resistance, humidity aging, and dry-wet alternation”, reproduces the dynamic changes of temperature and humidity in the natural environment, and accelerates the evaluation of product performance stability and structural reliability under extreme or cyclic climatic conditions. Finally, it determines whether the weather resistance of materials and products meets the expected application requirements. This paper focuses on analyzing its application in the LED lighting industry, especially the technical advantages in the lumen maintenance rate test of LED lamps (fully complying with the IES LM-80-08 standard). Combined with the equipment parameters and reference standards, it demonstrates its key role in industrial product R&D verification, production quality inspection and compliance certification. The research shows that relying on the advantages of wide temperature range coverage, high-precision temperature and humidity control, and multiple safety protection designs, the GDJS-015B can meet the testing needs of multiple industries such as LED lighting, electronic appliances and components, and provide a scientific basis for product weather resistance evaluation.

1. Introduction
In the process of industrial product R&D and production, environmental adaptability and reliability are core indicators to measure product quality. Temperature fluctuations, humidity changes and extreme climates in the natural environment often lead to product performance degradation, structural damage, and even safety hazards. The traditional natural exposure test has a long cycle and is greatly affected by the environment, which is difficult to meet the industrial production requirements for efficiency and accuracy. As a core type of environmental simulation equipment, the Temperature and Humidity Control Cabinet can quickly reproduce complex climatic scenarios through artificial regulation of temperature and humidity parameters, providing a controllable and efficient solution for product weather resistance testing.

The GDJS-015B Temperature and Humidity Control Cabinet developed by LISUN Group integrates precise temperature control, humidity control and program control functions. It is especially optimized for the lumen maintenance rate test needs of the LED lighting industry and fully meets the requirements of the IES LM-80-08 standard. This paper will comprehensively analyze the technical characteristics and practical value of the GDJS-015B from four dimensions: equipment technical principles, performance parameters, reference standards and industrial applications, providing a reference for relevant industries to select environmental verification equipment.

2. Technical Principles and Core Structure of the Temperature and Humidity Control Cabinet
2.1 Technical Principles
The core principle of the Temperature and Humidity Control Cabinet is to simulate the dynamic changes of temperature and humidity in the natural environment through the coordinated work of “temperature control + humidity control + circulation system”. Its working process mainly includes three links:
• Temperature Regulation: Through the alternating operation of the heating system (nickel-chromium alloy electric heater) and the refrigeration system (fully enclosed air-cooled single-stage compression), the temperature inside the cabinet can be accurately controlled from low temperature (minimum -70℃) to high temperature (maximum 150℃). The heating system adopts an independent heating module to ensure uniform heat generation; the refrigeration system is equipped with an original French TECUMSEH compressor to ensure the stability and continuity of the low-temperature environment.
• Humidity Regulation: Relying on the Finnish Vaisala humidity sensor to monitor the humidity inside the cabinet in real time, combined with the automatic water purification and supply system, the humidity is controlled within the range of 20%~98%RH through the cooperation of humidification and dehumidification modules. Compared with the traditional wet-dry bulb humidity control method, the Vaisala sensor has higher accuracy (humidity deviation is only -2%~-3%) and does not require regular maintenance, reducing operation and maintenance costs.
• Temperature and Humidity Uniformity Guarantee: The circulation system is equipped with a temperature-resistant and low-noise air-conditioning motor (noise ≤65dB) and a multi-blade centrifugal fan. It can force convection of the temperature and humidity air inside the cabinet, ensuring that the temperature and humidity uniformity in the working area is controlled within ±2℃ (temperature) and ±3%RH (humidity), avoiding the impact of local temperature and humidity deviations on the test results.

2.2 Core Structure
The structural design of the GDJS-015B focuses on “stability, durability and safety”, mainly including the following core components:
• Inner Tank and Insulation Layer: The inner tank is made of SUS304 stainless steel, which has the characteristics of corrosion resistance and easy cleaning, and is suitable for long-term damp heat test scenarios; the insulation layer adopts a composite structure of “polyurethane rigid foam + ultra-fine glass fiber”, and the door frame is equipped with a high-temperature aging silicone rubber sealing strip, which effectively reduces temperature and humidity leakage and lowers energy consumption.
• Control System: It adopts a self-developed temperature control instrument and PLC dual-core control, supports Chinese and English operation interfaces, and is equipped with USB/RS-232/RS-485 interfaces, which can be connected to a computer to realize remote monitoring and data traceability. Users can customize the temperature and humidity change curve (such as 12h+12h dry-wet alternating cycle) through program settings to meet the needs of different test standards.
• Safety Protection System: It integrates multiple safety protection functions, including leakage protection, short-circuit protection, heating tube overheating protection, motor overheating protection and compressor overpressure/overload/overcurrent protection, comprehensively ensuring the safety of equipment operation and test samples.

3. Performance Parameters and Reference Standards of the GDJS-015B Temperature and Humidity Control Cabinet
3.1 Key Performance Parameters
As a representative model of the GDJS series, the GDJS-015B has performance parameters covering the testing needs of multiple industries. The specific parameters are shown in the following table (including a comparison with other models of the GDJS series to highlight the characteristics of the 015B):

Note: The “*” in the table represents the temperature range code. A/B/C/D correspond to different low-temperature lower limits respectively, and users can choose according to test needs; the working chamber size (100×100×150cm) of the GDJS-015B is larger than that of conventional models, which can accommodate larger-volume LED lamps or electronic components and is suitable for batch testing needs.

3.2 Reference Standards
The design and testing functions of the GDJS-015B fully comply with a number of domestic and foreign authoritative standards to ensure the compliance and recognition of test results. The main reference standards are as follows:
Domestic Standards: GB/T 2423.1-2008 (Low-temperature Test), GB/T 2423.2-2008 (High-temperature Test), GB/T 2423.4-2008 (Alternating Damp Heat Test), GB/T 10586-2025 (Technical Specification for Damp Heat Test Chambers), GB 7000.1-2023 (Luminaires – Part 1: General Requirements and Tests), etc.
International Standards: IES LM-80-08 (Approved Method for Measuring Lumen Maintenance of LED Light Sources), IEC 60068-2-30:2005 (Environmental Testing – Part 2-30: Tests – Test Db: Damp Heat, Cyclic), IEC 60598-1:2024 (Luminaires – Part 1: General Requirements and Tests), ISO 16750-4:2018 (Road Vehicles – Environmental Conditions and Testing for Electrical and Electronic Equipment – Part 4: Climatic Loads), etc.

Among them, the IES LM-80-08 standard is a core test standard in the LED lighting industry. It requires the equipment to provide a long-term (such as 6,000 hours, 10,000 hours) stable temperature and humidity environment to accurately measure the lumen maintenance rate of LED lamps. Through high-precision temperature and humidity control (temperature fluctuation ±0.5℃, humidity deviation -2%~-3%) and long-term operation stability design, the GDJS-015B can fully meet the strict requirements of this standard.

4. Industrial Application of the GDJS-015B Temperature and Humidity Control Cabinet: Taking the LED Lighting Industry as an Example
4.1 Testing Needs of the LED Lighting Industry
The service life of LED lamps is closely related to the lumen maintenance rate, and temperature and humidity are key factors affecting these two indicators. In actual use, LED lamps may face complex climates such as high-temperature exposure (such as the high-temperature environment of outdoor street lamps in summer), low-temperature cold (such as the outdoor scene in northern winter) and high-humidity plum rain (such as the humid environment in southern China), leading to accelerated attenuation of LED chips, aging of packaging materials and decline in optical performance. Therefore, before the product is launched on the market, it is necessary to use the Temperature and Humidity Control Cabinet to simulate these scenarios and evaluate its long-term weather resistance.

According to the IES LM-80-08 standard, the lumen maintenance rate test of LED lamps needs to be carried out under specific temperature and humidity conditions (such as 55℃/75%RH, 85℃/85%RH) for thousands of hours. The luminous flux data at different time nodes are recorded to finally determine whether it meets the industry requirements of “lumen maintenance rate ≥70% at 6,000 hours” or “lumen maintenance rate ≥60% at 10,000 hours”. This test puts forward extremely high requirements on the temperature and humidity stability and long-term operation reliability of the equipment.

4.2 Application Advantages of the GDJS-015B in LED Lumen Maintenance Rate Testing
Aiming at the testing needs of the LED lighting industry, the GDJS-015B has the following irreplaceable advantages:
• Long-term Stable Operation Capability: The equipment is equipped with a French TECUMSEH compressor and a Vaisala humidity sensor, which can achieve stable operation for thousands of consecutive hours without temperature and humidity drift. For example, under the test condition of 85℃/85%RH, the GDJS-015B can maintain a temperature fluctuation of ≤±0.5℃ and a humidity deviation of ≤-3%, ensuring that the LED lamps are in a consistent environment throughout the test cycle, and the test data is more valuable for reference.
• Large-volume Working Chamber for Batch Testing: The working chamber size of the GDJS-015B is 100×100×150cm, which can accommodate multiple LED street lamps or panel lamps at the same time (such as 10 LED panel lamps of 600mm×1200mm), greatly improving the test efficiency and reducing the test cost of enterprises.
• Data Traceability and Intelligent Control: After connecting to a computer through the RS-485 interface, it can record the temperature and humidity data and luminous flux test data in real time (needs to be combined with the luminous flux test system), and automatically generate test curves and reports. Users can remotely monitor the test progress without on-site duty, reducing labor input.
• Safety Protection to Ensure Sample Safety: LED lamps may have risks such as short circuits and fires in long-term high-temperature and high-humidity environments. The leakage protection, heating tube overheating protection and other functions of the GDJS-015B can cut off the fault source in time to avoid sample damage and safety accidents.

Thermal Chamber, Temperature Humidity Chamber, Climate Chamber

4.3 Practical Application Case
An LED lighting enterprise needed to conduct the IES LM-80-08 standard test on a batch of outdoor street lamps and selected the GDJS-015B to carry out the test. The specific process is as follows:
• Sample Preparation: Select 10 LED street lamp samples, install them on special fixtures, and place them in the working chamber of the GDJS-015B to ensure uniform spacing between samples without affecting air circulation inside the cabinet.
• Parameter Setting: Set the test program through the equipment operation interface: first heat up to 85℃, humidify to 85%RH, and keep constant temperature and humidity for 1 hour (preheating stage); then keep 85℃/85%RH for 6,000 hours of continuous operation, and record the luminous flux data every 1,000 hours.
• Test Process Monitoring: Remotely monitor the temperature and humidity data through a computer, and the equipment automatically alarms when an abnormality is found. After 6,000 hours, the lumen maintenance rate of all samples is ≥75%, which far exceeds the industry standard requirements, and is judged as qualified.
• Report Generation: The equipment automatically exports the temperature and humidity curves and luminous flux change curves, and generates the IES LM-80-08 standard report combined with the test data, providing a compliance basis for the product to be exported to the European and American markets.
This case fully proves that the GDJS-015B can efficiently and accurately complete the environmental adaptability verification of LED lighting products, helping enterprises improve product quality and enhance market competitiveness.

5. Extended Applications of the GDJS-015B in Other Industries
In addition to the LED lighting industry, the GDJS-015B can also meet the testing needs of the electronic and electrical, automotive electronics, and component industries:
• Electronic and Electrical Industry: It is used for high and low temperature damp heat testing of consumer electronic products such as mobile phones and computers to evaluate their performance stability in extreme environments. For example, simulate whether a mobile phone can be turned on normally in a low-temperature environment of -40℃ and whether the motherboard is corroded in a high-humidity environment of 95%RH.
• Automotive Electronics Industry: According to the ISO 16750-4:2018 standard, test the climate adaptability of on-board navigation, sensors and other components. For example, simulate whether the electronic components function normally when the car is exposed to alternating environments of summer exposure (80℃) and winter cold (-30℃).
• Component Industry: It is used for aging testing of electronic components such as capacitors, resistors and chips to evaluate their service life and reliability under long-term temperature and humidity cycles. For example, test the capacity attenuation of capacitors in an environment of 60℃/90%RH to determine whether they meet the application requirements.

6. Conclusions 
As a core equipment for environmental adaptability verification, the LISUN GDJS-015B Temperature and Humidity Control Cabinet provides a scientific and efficient solution for the reliability testing of industrial products by accurately simulating multiple climatic scenarios. Its wide temperature range coverage (-70℃~150℃), high-precision temperature and humidity control (temperature fluctuation ±0.5℃, humidity deviation -2%~-3%) and long-term stable operation capability make it perform outstandingly in the lumen maintenance rate test of the LED lighting industry, fully complying with the requirements of the IES LM-80-08 standard; at the same time, its large-volume working chamber and multiple safety protection designs also adapt to the testing needs of the electronic and electrical, automotive electronics and other industries.