It is important when installing any lighting products that the IP rating is suitable for the application. In a nutshell, ingress protection (IP) is an international standard for classifying the degree of protection provided against intrusion (body parts such as hands and fingers), dust, accidental contact, and water.
Any fixture that is used in a bathroom, garden or wet environment should have an IP rating that is sufficient enough to stop the ingress of dust and water.
An IP rating consists of two digits. The first digit represents protection against the ingress of solid objects i.e. dust. The second digit represents protection against the ingress of liquids i.e. water. The higher the value of either digit, the greater the protection.