The human eye responds to light with wavelengths from about 790 nm (red light) to 430 nm (violet light). Light with wavelengths shorter than the human eye can see is called ultraviolet (beyond violet) light. In recent years the popular press has reported various scientific studies on the possible effects of skin exposure to light sources. However under normal use, there is no risk to humans of damage to the skin, such as sunburn, from light sources. For example, in typical office applications, the exposure to ultraviolet light during an 8-hour-day is equivalent to 10 minutes in the summer sun. UV emission from fluorescent lamps can be measured with the UV-PET value. This shows how many hours a person can stay continuously under the light of a lamp without any damage to the health. At GE Consumer & Industrial, Lighting all our lamps must have a UV-PET value of at least 50.