Ultraviolet (UV) light can be categorized into three wavelength ranges: UVA, UVB, and UVC.
Within these ranges, different applications correspond to specific UV LED wavelengths. As UV applications rapidly expanded between 2020 and 2025, industries have increasingly demanded higher optical output, better thermal management, and greater flexibility and adaptability.
Businesses require more advanced and customized light source solutions to support business transformation.
In recent years, industries such as horticulture lighting, curing, and disinfection have actively invested in the research and development of UV technologies, leading to significant advancements.
Effects and Applications of Different UV Wavelengths https://www.violumas.com.tw/aboutuv
Table of Contents
Main Focus
Comparison between UV LED and mercury lamps
Four key advantages of UV LED
Why choose UV LED?
Why Choose UV LED
Main focus of this article
Although ultraviolet (UV) technology has been widely used for over 40 years, ultraviolet light-emitting diodes (UV LEDs) are emerging as an ideal alternative to traditional mercury lamps due to their more environmentally friendly and sustainable characteristics.
The rise of UV LED technology has successfully overcome the limitations of mercury lamps in terms of performance, lifespan, and environmental safety, creating new opportunities for industries worldwide.
With flexible packaging options and controllable optical intensity and spectral characteristics, UV LEDs can be integrated into a wide range of systems and applications to meet diverse industry requirements.
Comparison between UV LED and Mercury Lamps
Traditionally, mercury lamps have been the primary source of UV light. However, with increasing environmental awareness and the implementation of the Minamata Convention, the demand for mercury-free light sources has grown rapidly.
The advancement of UV LED technology has brought attention to its advantages as a smaller, more robust, mercury-free, and energy-efficient light source.
Medium-pressure mercury lamps emit a broad spectrum, while low-pressure mercury lamps primarily emit a single wavelength at 254 nm. Although this wavelength is widely used in disinfection applications, its limited spectral range restricts its versatility compared to UV LEDs, which offer precise wavelength control (see Figure 4).
Taking disinfection applications as an example, the narrow peak wavelength of a 265 nm UVC LED is closer to the absorption peak of most bacteria and viruses. Therefore, compared to traditional 254 nm light sources, it can achieve higher sterilization efficiency.
The narrow spectral output of UV LEDs also enables innovative applications in areas such as UV curing, spectroscopy, and biomedical instrumentation.
Comparison Table: UV LED vs. Traditional Mercury Lamps
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Advantages of UV LED
Form Factor：The compact size of UV LEDs enables greater flexibility in product design. Compared to cylindrical mercury lamps, UV LEDs provide directional output, allowing more uniform irradiation over large areas. In addition, beam shaping can be achieved through optical lenses.
This advantage allows UV LEDs to be applied in innovative products such as portable devices and point-of-use water disinfection systems.
Start-up Time & Lifetime：Although mercury lamps are still suitable for long-duration, high-intensity continuous operation, they require warm-up time, and frequent on/off cycling reduces their lifespan.
In contrast, UV LEDs offer instant on/off capability and support frequent switching with minimal lifetime degradation. In addition, their optical output can be adjusted over time to compensate for aging, extending overall system lifetime.
Cost：While the initial investment cost of UV LEDs is relatively higher, their advantages become more apparent when considering long-term operational costs and maintenance convenience. UV LEDs require virtually no maintenance, and their simple driver circuits, compact size, and high energy efficiency contribute to reducing overall system costs.