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2025
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The actual use of a reflector
Category:
1. Method for Testing Ultraviolet Lamp Intensity
The reflectors were monitored using a UV-340B ultraviolet intensity meter, assessing 56 UV lamps equipped with polished aluminum reflectors installed in the patient area, 34 UV lamps without reflectors, and 51 stainless steel reflectors.
2. Results of the UV lamp intensity test
The intensity of the UV lamp with a reflector made from polished aluminum plates showed a significant difference compared to the UV lamp tube without a reflector (P < 0.01), while there was no notable difference in UV intensity between the stainless steel and polished aluminum materials (P > 0.05).
There is a significant difference in the efficacy rates between polished aluminum plate UV lamps and those without reflective covers. However, there is no noticeable difference in efficacy rates between stainless steel reflective cover UV lamps and polished aluminum plate reflective cover UV lamps.
According to the principle of light reflection, the use of a reflective cover enhances light density, including an increase in 254 nm wavelength light. When any metal is exposed to light, the photoelectric effect can occur. Yet, for many metals—such as zinc, copper, iron, platinum, and others—ultraviolet light is required to trigger this effect.
The negative charge produced by the photoelectric effect is actually an electron. After absorbing energy, the electron transitions to a higher-energy orbital, entering an excited state. This excited state is inherently unstable, prompting the electron to drop back down to a lower-energy orbit while simultaneously emitting a photon with specific energy—resulting in the emission of light, which may appear as visible light, infrared radiation, or ultraviolet light.
Thus, UV lamps equipped with reflective covers demonstrate higher efficacy rates compared to those without, as the reflector not only boosts the intensity of the UV light but also extends the lamp’s lifespan. For instance, when used without a reflector, a UV lamp typically drops below 70 µW/cm² (indicating it should be replaced immediately). However, once fitted with a reflector, the intensity remains above 70 µW/cm², allowing the lamp to continue functioning effectively and reducing unnecessary waste of resources.
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