Relative spectral energy distribution of UVA-340 fluorescent lamp in UV aging test chamber

The UVA-340 fluorescent UV lamp used in UV aging test chambers is specifically designed to simulate the medium- and short-wave ultraviolet radiation found in natural sunlight. This lamp has a relative spectral energy distribution that closely matches the requirements outlined in the relevant standards. It emits less than 2% of its total radiation below 300 nm, with the peak radiant energy occurring at 340 nm, making it ideal for testing material resistance to UV exposure. The relative spectral energy distribution of the UVA-340 lamp is measured across different wavelength passbands, as shown in the table below: | Wavelength Passband (nm) | Minimum (%) | Maximum (%) | |--------------------------|-------------|-------------| | λ < 290 | 0.01 | - | | 290 ≤ λ ≤ 320 | 5.9 | 9.3 | | 320 < λ ≤ 360 | 60.9 | 65.5 | | 360 < λ ≤ 400 | 26.5 | 32.8 | Note: The values in the table represent the cumulative irradiance within each wavelength passband as a percentage of the total irradiance between 290 nm and 400 nm. This range covers the majority of the UV spectrum relevant to aging tests. This lamp is widely used in industries such as automotive, coatings, and plastics to evaluate the durability of materials under simulated sunlight conditions. Its precise spectral output ensures accurate and repeatable results, helping manufacturers develop more UV-resistant products. The image below illustrates the relative spectral energy distribution of the UVA-340 lamp in a UV aging test chamber. 

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