How is the waterproof grade IP65/IP66/IP67/IP68 divided about the light strip?

It's a regular topic.

There is no difference for the first number of dustproof is 6,

The second digit waterproof,

5 represents the water spray test,

6 represents the strong water spray test,

7 represents the water immersion test, 1-meter deep water placed under 30min

8 is also a water immersion test, but longer times than "7" time which means more than 30 minutes.

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