If you look at the boxes for Christmas lights, you will see certain codes and symbols that tell you how and where these lights are meant to be used. Lights that can be used outside will have a water drop symbol on them, indicating that they are resistant to water damage. \
Outdoor lights might also be marked with an IP code. These are IPX3, IPX4, IPX5, and IPX7. \
These codes simply describe different levels of water safety for the lights. The IPX7 lights are rated as watertight. \