Relative spectral energy distribution of UVB-313 fluorescent lamp in UV aging test chamber

The UVB-313 fluorescent lamp used in UV aging test chambers is specifically designed to simulate the effects of sunlight on materials. Its relative spectral energy distribution closely follows the standards outlined in the table below. Notably, radiation with wavelengths below 300 nm constitutes less than 10% of the total irradiance, while the peak radiant energy occurs at 313 nm, making it ideal for accelerated aging tests. Here is the relative spectral energy distribution of the UVB-313 fluorescent lamp: | Wavelength Passband (nm) | Minimum (%) | Maximum (%) | |--------------------------|-------------|-------------| | λ < 290 | 1.3 | 5.4 | | 290 ≤ λ ≤ 320 | 47.8 | 65.9 | | 320 < λ ≤ 360 | 26.9 | 43.9 | | 360 < λ ≤ 400 | 1.7 | 7.2 | **Note:** The values in the table represent the cumulative irradiance within each wavelength passband as a percentage of the total irradiance. The total irradiance is measured from 250 nm to 400 nm. This lamp is widely used in industries such as plastics, coatings, and textiles to evaluate material durability under simulated UV exposure. Its specific spectral output helps replicate real-world conditions, ensuring accurate and repeatable results in aging tests. Understanding the spectral characteristics of the UVB-313 lamp is essential for selecting the right testing conditions and interpreting the results effectively.

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