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As a new type of curing equipment, LED UV curing machines are favored by customers for their high efficiency, environmental friendliness, stability and safety, and have been widely used in UV glue curing. UV mercury lamps appeared earlier and have a certain customer base. In addition, replacing a mercury lamp production line takes time, so some customers still use mercury lamps for UV glue curing.

Regarding which is better between LED UV curing equipment and UV mercury lamps, I believe you have seen many explanations on Baidu. Here we summarize the main differences as follows:

1. Environmentally Friendly & Pollution-Free
   Traditional mercury lamps use mercury bulbs containing mercury. Frequent bulb replacement generates a large amount of waste, which is troublesome to dispose of and transport, and improper handling causes serious environmental pollution. LED UV curing equipment uses semiconductor light emission with no environmentally harmful components, making it more eco-friendly.
2. Low Energy Consumption
   The effective luminous efficiency of LED UV curing equipment is more than 10 times higher than that of mercury lamps. It can be switched on and off instantly, consuming power only during irradiation, with almost zero power consumption in standby mode. Mercury lamps must keep running continuously whether effectively irradiating or not, consuming power constantly.
3. Service Life
   Traditional mercury lamps require tube replacement after only 1,000–3,000 hours, with a short service life and cumbersome operation. The service life of LED UV curing equipment is generally 30–40 times that of mercury lamps (up to 20,000 hours), with no need for bead replacement.
4. Ease of Operation
   Traditional mercury lamps require a long preheating time before reaching the required curing temperature. LED UV curing equipment can be switched on and off instantly, reaching the set power immediately, greatly improving production efficiency and enabling faster, more convenient operation.
5. Thermal Radiation
   The light source of LED UV curing equipment emits pure ultraviolet band without infrared components, producing no thermal radiation. The light source runs at a low temperature and will not damage cured products due to overheating. Traditional mercury lamps emit non-pure UV light mixed with a large amount of infrared radiation, raising the product surface temperature by 60–90°C, causing product positioning shift and a high reject rate.

LED UV curing is suitable for heat-sensitive, high-precision bonding processes such as plastic substrates, lens bonding, electronic products, optical fibers and cables, as well as ink printing.

6. Irradiation Intensity
   LED UV curing equipment uses high-power LED chips and special optical designs to achieve high-precision, high-intensity ultraviolet irradiation. Adopting advanced optical technology and manufacturing processes, it delivers more optimized high-intensity output and uniformity than traditional mercury lamps, nearly twice the luminous intensity. This results in faster UV glue curing and significantly improved production efficiency.