* Ultraviolet (UV): 253.7 nm (strongest), 185 nm
* Visible: 404.7 nm (violet), 435.8 nm (blue), 546.1 nm (green), 577.0 nm (yellow), 579.1 nm (yellow)
The specific wavelengths emitted depend on the type of mercury lamp. For example, a low-pressure mercury lamp emits primarily the 253.7 nm UV line, while a high-pressure mercury lamp emits a wider range of wavelengths, including visible light.
Therefore, when referring to the wavelength of mercury light, it's important to specify which specific line or emission you are interested in.
