What is IP waterproof grades of lamps?

IP is the abbreviation of Ingress Protection Rating (or International Protection code), which defines the protection ability of an interface to liquid and solid particles. The IP protection level is composed of two digits:
The first number is 1: It indicates the protection level of the lamp from dust and preventing the intrusion of foreign objects. The range is 0-6, representing protection from large particles to dust, respectively
The second number is P: It indicates the airtightness of the temperature of the lamp and the waterproof intrusion. The range is 0-8, representing protection from vertical water dissipation to underwater music, respectively.
The larger the number, the higher the protection level. Generally, the underwater lights are 65, 67, and 68. The same buried lights, the LED light source can achieve the tube level of the water lamp, and the LED light source is lower, only about 54.

What is the difference between different waterproof grade lamps?

The following are the places where lamps of different grades are used