Outdoor lighting is unique from interior lights in that they are exposed to the elements constantly. Without proper protection, your exterior lighting could rust or otherwise become compromised by moisture and debris.
IP ratings help you navigate these risks. IP ratings, or Ingress protection ratings, are a way to indicate how well a light resists entry of moisture and debris. The first digit indicates the resistance to solids, while the second indicates its resistance to moisture.
First Digit – Solids
0 – Does not protect against solid materials
1 – Will protect against entry of solid objects that are 50 millimeters or larger
2 – Will protect against entry of by solid objects that are 12 millimeters or larger
3 – Will protect against entry of by solid objects that are 2.5 millimeters or larger
4 – Will protect against entry of by solid objects that are one millimeter or larger
5 – Offers dust protection
6 – Completely dust tight
Second Digit – Moisture
0 – Does not protect against moisture
1 – Will protect against vertically falling water drops
2 – Will protect against falling water drops at a maximum angle 15 degrees
3 – Will protect against falling water drops at a maximum angle 60 degrees
4 – Will protect against splashing or projection
5 – Will protect against low pressure jets
6 – Will protect against high pressure jets
7 – Will protect against temporary immersion
8 – Will protect against long periods of immersion
When it comes to outdoor lighting, having IP65 rated lights or higher will give the best protection.