Waterproof LED strips should not be selected only by the IP number. IP65, IP67 and IP68 represent different levels of protection, but real reliability also depends on the waterproof structure, end sealing, wires, connectors, installation environment and test method. For refrigeration, outdoor, wet or underwater projects, the cable exit and connector system are often more critical than the middle section of the strip.

1. Basic understanding of IP65, IP67 and IP68

IP65 is commonly used for dust protection and water spray resistance. IP67 is used for higher waterproof requirements and short-term immersion conditions. IP68 is used for more demanding underwater or long-term wet applications, but it must be developed and validated according to the actual project. It should not be assumed that every IP68 strip can be used underwater in any condition.

2. Common waterproof structures

Waterproof LED strips may use epoxy or silicone coating, transparent heat-shrink tube, silicone extrusion, neon extrusion, potted end caps and waterproof connectors. Each structure has different flexibility, appearance, weather resistance, serviceability and cost. Outdoor neon and wet environments require attention to silicone material, end sealing and UV aging. Refrigeration projects focus more on condensation, cable corrosion and end leakage.

3. Why pressure testing matters

For underwater or long-term wet environments, an IP68 structure can be developed by project and validated through pressure waterproof testing. Pressure tests can use above-water or underwater pressure modes to simulate water depth within the equipment’s operating range. Leakage can be observed through continuous bubbles or water ingress. Test conditions should be defined according to project requirements.

4. Project recommendations

· Use IP20 or non-waterproof construction for dry indoor applications.

· Use IP65 or IP67 with proper end sealing for moisture, spray or condensation.

· For underwater or long-term wet projects, confirm IP68 structure, waterproof terminals and pressure testing by project.

· Always verify the strip, cables, connectors, end caps and installation method as one system.

Engineering Checklist

· Is the environment water spray, short immersion or long-term underwater use?

· Are there cut ends, connectors or middle joints?

· How are end caps and cable exits sealed?

· Are waterproof connectors or terminals required?

· Is spray testing or pressure waterproof testing required?

· Will the product face UV, salt mist, low temperature or cleaning chemicals?

FAQ

Q: Can every IP68 LED strip be used underwater long term?

A: No. IP68 must be checked against depth, time, cable exit, connector and end sealing conditions.

Q: Where do waterproof LED strips most often fail?

A: Cut ends, end caps, cable exits, connectors and field installation are common failure points.

Q: Does a refrigerated display always need IP68?

A: Not always. Condensation, end sealing, cable corrosion and mounting position may be more important than simply choosing the highest IP rating.

Related Pages (replace with links after launch)

· Testing & Validation

· Refrigerated Display Lighting Solutions

· Neon Flex Products

· Downloads - Test Reports