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Ultraviolet B (UVB) light is the second of three types of UV light. UVB comprises the UV light band. Like UVA light, the sun emits it naturally. Commercial tanning bed bulbs and indoor tanning bed bulbs also expose the skin to UVB light.
Unlike UVA light, UVB light is partially absorbed by the ozone and mainly affects the surface of your skin. Overexposure to UVB light from the sun, an indoor tanning bed, or other device may result in sunburn. Regular, limited exposure to UVB light creates a nice, healthy tan on the body.