What Is The Difference Between Cold Cathode UV Disinfection Lamp And Hot Cathode UV Disinfection Lamp?
Jan 05, 2024
The difference between cold cathode UV disinfection lamp and hot cathode UV disinfection lamp
1. The luminescence principles of cold cathodes and hot cathodes are different
The glow discharge of cold cathode is compared with the arc discharge of hot cathode:
Glow discharge uses positive ions to bombard a high-purity metal cathode to generate secondary electron sustaining discharge. The cathode current is mainly contributed by positive ions, the current is small, and the cathode is cold, so it is named "cold cathode";
In hot cathode arc discharge, the cathode current is mainly provided by the thermal electron emission of the electron powder coated on the cathode surface, and the current is much larger, reaching 600~700mA. The cathode is hot, hence the name "hot cathode".
2. The materials, processes, and instructions of cold cathodes and hot cathodes are different.
Hot cathode UV lamps use tungsten wire as the cathode body, and its surface is coated with a low work function metal oxide. During the working life of hot cathode ultraviolet lamps, oxides have chemical and electrochemical "poisoning" problems, so the life of the lamp is generally only more than 4,000 hours. The cathode of Nengboda cold cathode ultraviolet lamp is made of pure metal sheet, and there is no poisoning problem. Therefore, its lifespan is 5 to 10 times longer than that of hot cathode lamp, and can reach more than 20,000 hours.
3. The irradiation intensity of cold cathode and hot cathode is different
The radiation intensity of new ordinary ultraviolet lamp tubes is greater than 90uW/cm, which is considered qualified. The radiation intensity of cold cathode ultraviolet disinfection lamps is above 200uW/cm, which is generally more than twice that of hot cathode disinfection lamps.
4. The shapes of cold cathodes and hot cathodes are different
Cold cathode UV lamps are much smaller than hot cathode UV lamps. Especially when the diameter of the lamp tube is small, it can be processed into special-shaped lamps such as U-shaped, straight, O-shaped or coiled-type lamps. The uses are also diverse, including mobile phone disinfection boxes, toothbrush disinfection boxes, disinfection bags and other portable sterilizers.
5. The energy consumption of cold cathode and hot cathode is different
Since the cold cathode has a smaller current and can use direct current, under the same sterilization effect, the cold cathode saves more energy than the hot cathode!
