UV-C LED:
Different from the dispersed wavelength light emitted by leds used in conventional lighting, UV-C leds usually emit short-wave ultraviolet (UV-C) at a wavelength of 275nm with 100% intensity to sterilize the light. FIG. 1A and 1b show the relationship between intensity and wavelength of UV-C LED and lighting LED respectively. To ensure effective sterilization, the UV-C LED design focuses on a wavelength of 275nm at 100% strength

Sterilization LED lights:
There are two aspects to pay attention to when UV-C LEDS are used for sterilization: distance and time. As shown in Figure 3, a single 2.5-watt UV-C LED can kill 99 percent of bacteria in a plane with a diameter of 10 centimeters. Since the irradiance is equal to the radiant flux per unit area, and the farther the distance, the lower the radiant flux. If a light source is 6cm away from a flat surface, it kills 99.9% of bacteria; if the same light source is 10cm away, it kills only 25% of bacteria in the same time. In order to achieve the same sterilization effect, the need for longer light time.

It takes five minutes to kill 99.9% of the bacteria at a distance of 45cm from a light source, but 18 minutes at a distance of 100cm. So time and distance are two important parameters in the use of UV-C LED. Uv-c LED devices also often have the ability to set the cycle sterilization per timer switch. The common switching frequency is every 15 or 30 minutes.

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