The suns spectrum is made up of many different types of light including, UV, infrared and visible.  The UV part of the sun’s light is the part that can be most damaging, this is the part that will give you sunburn and skin cancer and so this is also the part that is most likely to cause damage to your materials and samples.

There are several UV options available to run, including UVA, UVB (UVB being the harsher of the two options) and UVC. To simulate outdoor weathering, the QUV accelerated tester reproduces the damage caused by sunlight, rain and dew. In a few days or weeks, the QUV unit exposes materials to alternating cycles of UV light and moisture at controlled, elevated temperatures to reproduce the damage that occurs over months or years outdoors. Essentially the QUV accelerated weathering tester unit can handle all weathering conditions and is the go-to accelerated weathering model unit.