What is the wavelength?
What are the advantages and disadvantages?
UV rays are also used to treat psoriasis; the rays slow the growth of skin cells, preventing the outbreak of the itchy patches for which psoriasis is known. In spite of all their positive uses, UV rays remain very harmful for anyone who spends a large amount of time in the sun without proper protection. The most common effect of exposure to UV rays is sunburn, which may eventually lead to skin cancer.