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All of the QUV accelerated weathering tester's lamps emit mainly ultraviolet rather than visible or infrared light, each lamp type differs in the total amount of UV energy emitted and in its wavelength spectrum. Fluorescent UV lamps are usually categorized as UVA or UVB lamps, depending on the region into which most of their output falls.
Your exposure application determines which type of UV lamps should be used.
v UVA Lamps
UVA lamps usually provide better correlation with actual outdoor weathering. Because UVA lamps do not have any UV output below the normal solar cutoff of 295 nm, they usually do not degrade materials as fast as UVB lamps.
UVA-340
The UVA-340 provides the best possible simulation of sunlight in the critical short wavelength region from 365 nm down to the solar cutoff of 295 nm. Its peak emission is at 340 nm.
The UVA-340+ lamps provide the same spectrum, but can be used for testing at higher output levels.
UVA-351.
The UVA-351 simulates the UV portion of sunlight filtered through window glass. It is most useful for interior applications, testing of some inks, and for polymer damage that can occur in an environment near a window.
v UVB Lamps
UVB lamps extend below the shortest wavelengths of sunlight found on the earth’s surface. Consequently, fluorescent UVB lamps are widely used in QC and R&D for fast, cost-effective results.
UVB-313EL.
The UVB-313EL gives fast results and it is particularly useful for QC and R&D applications and for durable materials. The UVB-313EL produces substantially higher UV output, faster test results and is very stable.
The UVB-313EL+ offers higher maximum output with a similar spectrum to the UVB-313EL lamps.
Note: UVB-313EL+ lamps must be calibrated using the Universal Calibrator system. They cannot be calibrated with a CR10.
v Conclusion:
UVA-340/UVA-340+: Especially useful for comparison tests of different formulations. Recommended for correlation with outdoor results for most plastics, textiles, coatings pigments and UV stabilizers.
UVB-313EL/UVB-313EL+: Best for quality control applications. Recommended for durable materials such as roofing, some exterior coatings etc.
UVA-351: Most useful for UV "sunlight through glass” simulations. Recommended for some automotive interiors, textiles and inks.
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Instruction for UV lamp Replacement:
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