This device conforms to ASTM G151 and uses long ultraviolet fluorescent lamps arranged on both sides of the instrument. The exposure is a cycle of ultraviolet light and condensation, which is produced on the front surface of the specimen. There are currently three different lamps available for use in this type of device, each having a different spectral output.
UVB-313: These lamps are the standard for use in this type equipment. The spectral distribution is centered at 313nm and contains much energy in the UVB range which is not found in sunlight at the earth's surface.
UVA-351: This lamp has a spectral output centered at 351 nm and produces much slower rates of deterioration than the 313 lamp. There is no energy below 300 nm. this lamp is used to simulate behind window glass exposure.
UVA-340: This lamp was introduced in 1987 and has a spectral output centered at 340 nm. The spectral energy curve for this lamp is similar to that of sunlight between the cut on & approximately 360 nm. The UVA-340 lamp is therefore recommended when using this device to simulate outdoor conditions.

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