<prompt> The range of UV light, which causes maximum skin damage, is:760-800 nm360-400 nm290-320 nm240-290 nm  <response>: The biologically most active pa of the solar spectrum is UVB 290 -320 nm since it is primarily responsible for the induction of inflammation, carcinogenesis and immunosuppression. UV-B - wavelength 290 and 320 nm most efficient in producing redness or erythema in human skin and thus is some- times known as the sunburn spectrum. UV-A wavelength 320 and 400 nm is 1000-fold less efficient in producing skin redness than is UV-B. 