What Do IP Ratings Mean for LED Strip Lights?
The Ingress Protection (IP) rating system, defined by IEC 60529, classifies the degree of protection provided by electrical enclosures against solid particles and liquid ingress. For LED strip lights, the IP rating is one of the most critical specifications — it determines where the strip can be safely installed and how long it will last in its environment.
Choosing the wrong IP rating is one of the most common mistakes in LED strip projects. Using an indoor-rated strip in an outdoor setting leads to premature failure, while specifying an unnecessarily high IP rating for a dry indoor application adds cost without benefit. This guide breaks down every IP rating commonly encountered in LED strip lighting and helps you make the right choice for each application.
Decoding the IP Rating System
An IP rating consists of two digits:
- First digit (0-6): Protection against solid objects and dust. For LED strips, this is almost always 2 (protection against fingers and small objects) or higher.
- Second digit (0-8): Protection against water. This is the critical digit for LED strip selection.
Common IP Ratings for LED Strips Explained
IP20 — No Water Protection
IP20 LED strips have no coating or encapsulation. The LED chips and copper traces are exposed to ambient air. These strips are designed exclusively for dry indoor environments where no moisture contact is expected.
Typical applications: Under-cabinet lighting, furniture illumination, ceiling cove lighting in living rooms and bedrooms, retail display cases, and office accent lighting.
Limitations: Any contact with water, condensation, or high humidity will cause corrosion and failure. Do not use in bathrooms, kitchens near sinks, or any outdoor location.
IP54 — Splash Resistant
IP54 strips have a basic nano-coating or light silicone layer that protects against water splashes from any direction. The coating is thin enough that it does not significantly affect light output or color temperature.
Typical applications: Bathroom mirror lighting, kitchen backsplash areas, covered outdoor patios (not directly exposed to rain), and commercial spaces where occasional cleaning involves water spray.
Limitations: Not suitable for direct rain exposure, standing water, or submersion. The nano-coating can degrade over time in continuously wet conditions.
IP65 — Jet-Proof (Full Surface Protection)
IP65 strips feature a complete silicone or epoxy coating over the top surface and components. Unlike IP54, the coating fully encapsulates the LED chips and resistors, providing protection against low-pressure water jets from any direction.
Typical applications: Outdoor architectural lighting, facade accent lighting, outdoor signage, garden path lighting under cover, and commercial kitchen ceiling lighting where regular washdown occurs.
Limitations: The coating can slightly reduce light output by 5-10%. Standard IP65 strips should not be submerged. Cut ends must be resealed after installation.
IP67 — Temporary Submersion
IP67 strips are fully encapsulated — typically in a silicone sleeve or full epoxy encapsulation — and can withstand temporary submersion in water up to 1 meter depth for 30 minutes. The entire strip, including the top, sides, and bottom, is sealed.
Typical applications: Outdoor ground-level installations subject to rain pooling, step lighting in wet areas, swimming pool perimeter lighting (not in-pool), and outdoor furniture lighting.
Limitations: Prolonged submersion beyond 30 minutes may cause water ingress. The silicone sleeve can trap heat, reducing maximum ambient temperature rating. Not suitable for continuous underwater use.
IP68 — Continuous Submersion
IP68 is the highest waterproof rating for LED strips. These strips are designed for continuous underwater operation — typically rated for submersion at depths of 1-3 meters indefinitely. The encapsulation uses high-grade silicone or specialized resin that maintains flexibility and optical clarity under water pressure.
Typical applications: Swimming pool and fountain lighting, pond and water feature illumination, aquarium lighting, spa and hot tub ambiance lighting, and marine below-deck lighting.
Limitations: IP68 strips are the most expensive option due to the premium encapsulation materials. Light output may be reduced by 10-15% due to the thicker coating. Ensure all connections and end caps are also rated IP68.
How Waterproof Coatings Affect Performance
Light Output
Every coating layer absorbs or scatters some light. As a general rule:
- Nano-coating (IP54): 2-5% light reduction
- Silicone coating (IP65): 5-10% light reduction
- Silicone sleeve (IP67): 8-12% light reduction
- Resin encapsulation (IP68): 10-15% light reduction
To compensate, specify higher-lumen strips when using higher IP ratings. For example, if your design calls for 1000 lumens/m at the surface, use a 1100 lm/m strip with IP67 encapsulation.
Color Temperature Shift
Thicker coatings can cause a slight color temperature shift (typically 100-300K warmer) due to the yellowish tint of silicone materials. High-quality manufacturers use optically clear silicone that minimizes this effect. Always request samples before specifying IP67/IP68 strips for color-critical applications.
Thermal Performance
Encapsulated strips run hotter because the coating traps heat. This reduces LED lifespan if not properly managed. Always install encapsulated strips in aluminum channels to provide a heat sink path. In direct sunlight, encapsulated strips can reach internal temperatures of 70-80°C — ensure your strips are rated for these conditions.
Selection Guide: Match IP Rating to Your Application
| Environment | Recommended IP | Key Consideration |
|---|---|---|
| Indoor, dry (offices, living rooms) | IP20 | Maximum light output, lowest cost |
| Bathroom, kitchen splash zone | IP54 | Resists occasional moisture |
| Outdoor, covered (eaves, signage) | IP65 | Withstands rain and wind-driven water |
| Outdoor, ground level (step lights) | IP67 | Handles rain pooling and temporary flooding |
| Underwater (pools, fountains) | IP68 | Continuous submersion rated |
| Food processing washdown | IP65-IP67 | Withstands high-pressure cleaning |
Installation Tips for Waterproof LED Strips
- Always reseal cut ends. Use the supplied silicone end caps or marine-grade sealant. This is the single most important step for long-term waterproof performance.
- Do not pierce the coating. If you need to mount the strip with screws, use aluminum channels that clamp over the strip rather than drilling through the coating.
- Test before sealing. Power on and test the complete installation before applying final sealant. Finding a fault after sealing requires stripping the coating.
- Use compatible connectors. Waterproof connectors (IP67-rated) are available for joining waterproof strips. Standard connectors will compromise the IP rating.
BrightLink LED: Waterproof Strip Solutions for Every Environment
BrightLink LED manufactures LED strips in all IP ratings from IP20 to IP68, with nano-coating, silicone coating, sleeve encapsulation, and resin encapsulation options. Every waterproof strip undergoes a 24-hour water immersion test before shipment. Our product team can help you select the optimal IP rating for your specific environment and provide samples for evaluation.
Need help choosing the right waterproof LED strip for your project? Contact BrightLink LED for expert advice, free samples, and competitive pricing.