UV light can be dangerous if you are directly exposed to it like you are outside in direct sunlight. This is why we apply suntan lotion or sun block when we plan on spending extended time in the sun. The Elevated Air Germicidal UV lights are installed into your furnace or duct work to kill or sterilize germs as they pass through the system. You will not have any direct contact with the UV light and they are very safe and beneficial when installed properly.