UV Exposure Testing - Bulb Types
Here is a quick run-down on the types of bulbs used in UV, Accelerated weathering tests.
There are many different spectral irradiances of UV bulbs. Generally speaking:
500 hours under UV-B bulbs = 1 year of South Florida exposure
1000 hours under UV-A bulbs = 1 year South Florida exposure
1000 hours under Xenon Arc = 1 year South Florida exposure
There are additional UV exposure categories for an Arizona climate. (Dry, more intense UV & heat )
UV-A light tends to accelerate a yellowing or fading with its exposure. Colored products could benefit from UV-A exposure, as yellowing or fading is undesirable. UV-A bulbs can offer Daylight and UV behind window glass exposures. UVA-340 offers the best correlation to outdoor exposures because it is the best simulation of sunlight from 295 nm to 365 nm.
UV-B Bulbs: UV-B light tends to accelerate or create “brittleness” or an aging process not typically occurring outdoors. UV-B bulbs can accelerate the degradation of polymer. UVB-313 bulbs offer maximum acceleration by utilizing short-wave UV that is more severe than normally found on the earth’s surface.
Xenon Arc: In general, Xenon Arc bulbs are more capable of providing a natural sunlight spectrum. ASTM G155 is the specification to select for xenon arc exposure.
Indoor Exposure – Fluorescent:
Cascade TEK also offers UV “Cool White” Exposure for indoor exposure to fluorescent lighting.
Cascade TEK is accredited to perform accelerated weathering – UV exposure testing to a wide variety of industry standards. Contact us for assistance in determining which accelerated weathering tests may be appropriate for your products.