Sunburn is completely different from a tan. The red color is increased blood flow, sent to the skin to help your body repair the damage done from overexposure.
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PROTECTION:
A smart tan naturally enhances protection against sunburn. Melanin literally enshrouds skin cells protecting them from getting too much UV exposure. Additionally, as the skin tans the outer layer thickens, which also is nature’s design to make tan skin naturally more resistant to sunburn.
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BETTER SUNSCREEN:
As most tanners know, a suntan multiplies the effectiveness of sunscreen in outdoor sunburn prevention. For example, an SPF 15 product applied to the skin of a person whose base suntan has already made her two-to-four times more resilient to sunburn creates a “net SPF” of about 30-60.
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SPF 15 x 2 = SPF 30
SPF 15 x 4 = SPF 60
SPF 15 x 4 = SPF 60
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From SmartTan.com