UV lamps are healthy?

Hello,

I would like to ask that there is UV lamp in Bag zappers and Air purifiers, the UV ligth from these lamps does get unto our skin even though there is only 3x8 watts lamps in bag zapper. Does artificial UV light cause any health effects to human skin? Because natural UV light from the Sun does i know it's very strong but still UV light is a UV isn't it even frequencies change? Is artificial UV doesn't do any harm at all even though it's very low compares to Sun?

Regards,