To help identify what luminaire is suitable for which application, they are given an IPXX rating. The IP denotes Ingress or International Protection code and the X denotes first and second characteristic numerals. An IPXX rating categorises the level of protection the luminaire has against dust, solid objects and moisture. These ratings are given in accordance with European standard EN60598-1.
Luminaires installed outdoors will be exposed to rain, dust and solid objects. Luminaires in these environments will typically have an IP rating of IP54 to IP65. Conversely, luminaires installed indoors in an office or corridor would typically have much lower IP rating, i.e. IP20.
Ingress Protection (IP Rating)