The waterproof performance of LED strip light mainly depends on its protection level, which is usually expressed by IP (Ingress Protection) rating, which consists of two numbers, the first one stands for dust protection level and the second one stands for waterproof level. Examples are IP65, IP67 or IP68.

IP65: A dust protection rating of 6 means that it is protected against dust ingress; a waterproof rating of 5 protects against jets of water from all directions.

IP67: The same as IP65 in terms of dust protection rating, but the waterproof rating is increased to 7, meaning that it can be immersed in a certain depth of water for a short period of time (typically 1 metre deep).

IP68: This is one of the highest protection ratings and can withstand deeper underwater pressure in addition to dust protection and protection against prolonged immersion.

If you plan to install your LED strips outdoors, it is recommended that you choose waterproof products with at least an IP65 rating or higher to ensure that they are resistant to rain and other moisture. However, even with a high waterproof rating, you need to pay attention to how they are installed and make sure that the connectors and power supply sections are well sealed to avoid moisture from entering through these areas.

Overall, properly selected and installed waterproof LED strips are usually safe for outdoor use and will not easily allow water to enter or cause electrical leakage. However, any electrical equipment is potentially at risk in wet environments, so it's important to follow the manufacturer's installation guidelines and ensure that appropriate electrical protection is used, such as the use of a waterproof power box and terminals.