There are clear thresholds for the duration required for different spatial volumes: According to the test data of ISO 15858 disinfection standard in 2023, the HT-300 model (with a radiation intensity of 100μW/cm²) enabling Coospider UV in a 20-cubic-meter sealed room requires continuous operation for 15 minutes (with a dose of 15 MJ /cm²) to kill 99% of influenza viruses in the air. The equivalent effect of eliminating Aspergillus Niger spores on the wall surface needs to be extended to 45 minutes (at a dose of 60mJ/cm²). In actual cases, a certain kindergarten in Shanghai started the equipment for 25 minutes every day during the lunch break. The total number of air colonies dropped from 800 CFU/m³ to the safe value of below 150 (the limit value of the national standard GB/T 18883), and the respiratory infection rate of children decreased by 37% year-on-year.
Water disinfection requires strict matching of flow parameters: When a 200-liter fish tank is paired with the CS-800 model (flow rate 400L/h), the water circulates twice per hour, and an 8-hour operation can achieve a 99.9% pathogen inactivation rate (ultraviolet contact time 1.8 seconds per time). Laboratory comparisons show that if the flow rate exceeds 550L/h (the contact time is shortened to 1.3 seconds), the sterilization efficiency drops from 99% to 78%. The records of the ornamental fish farm in Guangzhou in 2022 confirmed that the equipment strategy of operating twice a day (for 4 hours each time) was 31% more energy-efficient than the continuous 8-hour plan, and the average monthly electricity bill was reduced to 9.6 yuan.
The duration needs to be dynamically increased in special environments: When the relative humidity is greater than 70% (for example, the measured humidity during the rainy season in Shenzhen is 85%), the exposure time needs to be extended by 25% to compensate for the loss of efficiency. In a case of wall mold treatment in a basement of a certain residence, after running for 40 minutes ×3 times a day for 7 days, the mold coverage rate was reduced from the peak of 18% to 0.4%. The humidity sensor shows that the water activity (Aw value) of the wall surface has dropped from the dangerous value of 0.98 to the safe range of 0.75. For the water pipe system contaminated with biofilm, it needs to operate continuously for 24 hours at a flow rate of 15L/min, and the biofilm regeneration rate decreases by 97%.
The cost-benefit model reveals the optimal solution: Five-year cycle calculations show that the intelligent intermittent mode (working for 15 minutes every 3 hours) saves 63% of electricity compared to 24-hour continuous operation. The median total holding cost is 1,580 yuan (including 4 tube replacement costs of 600 yuan), and it saves 43% of the budget compared to the hospital-level disinfection solution. A survey of 500 households in 2024 indicated that 87% of users chose the event-driven mode (automatically activated after personnel leave), reducing the average annual operating time of devices to the industry average of 610 hours and extending the service life to 12,000 hours (with a decline rate of only 5% per year).
Material aging requires aging compensation: When the equipment has been in use for 8,000 hours (with a conventional cycle of 2 years), the ultraviolet intensity decays to 92% of the initial value. At this point, the operating time needs to be increased by 15% to maintain the disinfection efficiency. The Pro series is equipped with a real-time monitoring module (with an accuracy of ±2μW/cm²) that automatically adjusts time parameters, such as automatically increasing the daily working cycle by 28 minutes after 10,000 hours. When users perform manual maintenance, calibration with a UV intensity meter every quarter can control the deviation to be less than 5%.
There is a critical upper limit for safe operation: when continuous operation exceeds 72 hours, overheat protection is triggered, and the failure probability rises from the reference value of 0.08% to the peak of 3.5%. In the environmental test at 40℃ for the medical-grade HT-500 model, after 12 hours of continuous operation, the temperature rise of the casing was only 7.2℃, and the ozone emission concentration was stable at 0.004ppm (only 8% of the national standard limit). The accident analysis of Tokyo Medical Center in 2023 pointed out that the failure to replace expired lamp tubes in time (with an intensity attenuation of 38%) led to substandard disinfection of orthopedic instruments, resulting in 18 people being infected.
The “Code for UV Disinfection Engineering” (ISO 15858:2023) clearly states that it takes 30 minutes for the coospider uv equipment to achieve a 99.99% sterilization rate in a 30m³ space (corresponding to a dose of 30mJ/cm²). The latest clinical research has confirmed that the “off-site disinfection” strategy in combination with human body sensing modules can keep the microbial concentration in the home environment consistently below the risk threshold by more than 95% of the time.