Как правильно загорать?

[Инкогнита (Daisy)]

<a href="http://www.fda.gov/cdrh/consumer/tanning.html" target=_blank><i>Since most sun lamps and tanning beds emit UVA radiation, doesn't that make them safer than natural sunlight?</i>
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No. It's true that most sun lamps emit mainly UVA radiation, and that these so­called "tanning rays" are less likely to cause a sunburn than UVB radiation from sunlight. But, contrary to the claims of some tanning parlors, that doesn't make them safe. UVA rays have a suspected link to malignant melanoma, and, like UVB rays, they also may be linked to immune system damage. </a>

Вот еще:

<a href="http://www.fda.gov/fdac/features/2003/603_tan.html" target=_blank><b>Indoor tanning can be as harmful as outdoor tanning</b>. More than 1 million people visit tanning salons on an average day, according to the American Academy of Dermatology (AAD). But many don't know that indoor tanning devices, such as tanning beds and sunlamps, emit ultraviolet (UV) radiation that's similar to <b>and sometimes more powerful</b> than the sun. The Food and Drug Administration discourages the use of tanning beds and sunlamps.
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<b>Be wary of claims about "safe rays" because there is no such thing</b>. Both types of ultraviolet light, UVB and UVA, can cause wrinkling and other signs of premature skin aging, skin cancer, and damage to the eyes and the immune system.</a>

Ссылки ведут на полные тексты.

И т.д. У Полы в книжке чуть подробнее описано.