Understanding IP ratings ensures that a fixture is appropriately chosen and installed for optimal performance and durability in various conditions.  For instance an exterior light often requires a high IP rating, meaning an IP65 can, withstand heavy rain, climate changes, insects and all other debris that can found in the outdoors. 

Lower IP ratings – such as those at IP20 or lower- are mostly suited for indoor use in spaces that have virtually no exposure to dust or water, like your living room or bedroom. However, in bathrooms or kitchens where water splashes or high humidity is common, it is advisable to choose lighting fixtures with a higher IP rating such as IP44 or higher.