Ultraviolet (UV) is the invisible light that exists in a natural environment.
Based on the wavelength, energy and biological effects, UV could be classified into three types: long wavelength UVA, middle wavelength UVB and short wavelength UVC.
About 95% of ultraviolet rays are UVA. Although UVA has lower energy, it has strong penetrating power and could cause the most significant damage to the skin.
In the past, traditional fluorescent lights contained more ultraviolet rays than LED lights.
Although the ultraviolet rays from fluorescent lights are not harmful, prolonged exposure may cause the skin to darken.
However, with the widespread use of LED lights, the ultraviolet content in LED lights used for general lighting is almost negligible, which relatively reduces the problem of tanning.
It mainly comes from electronic devices such as computers, smartphones, and televisions.
Although it does not directly cause tanning, long-term exposure may still lead to skin pigmentation and ageing.