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 following table. Notably, the radiation below 300 nm constitutes less than 2% of the total output, with the peak radiant energy occurring at 340 nm. This makes it ideal for testing the effects of UV exposure on materials under controlled laboratory conditions. The relative spectral energy distribution of the UVA-340 fluorescent lamp in a UV aging test chamber is as follows: | 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 lamp is widely used in industries such as automotive, aerospace, and plastics to evaluate the long-term durability and degradation of materials caused by UV exposure. By replicating the UV spectrum of sunlight, the UVA-340 lamp helps researchers and engineers predict how products will perform over time when exposed to outdoor conditions. The precise control of the spectral distribution ensures accurate and repeatable test results, making it an essential tool in material testing laboratories around the world.

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