IP rating is a global standard showing how resistant a product is against the intrusion of solids and liquids. The first digit is given as a number between 0 & 6 which establishes the level of protection from a solid object, whereas the second digit is given as a number value of between 0 & 9, establishing the level of resistance to moisture. The higher the number, (but not always), the more stringent the protection.
A rating of IP20 is the most common for bedrooms and living rooms, whereas light fittings rated IPX4 are protected against splashing water, making them ideally suited for indoor use, in areas such as bathrooms and kitchens, as well as some sheltered outdoor locations.
Fixtures rated IPX5 are protected against water jets onto the enclosure from any direction. These fittings should be selected for gardens, exposed outdoor areas and for certain areas where a high level of protection is required.