防水性の LED ストリップ ライトの究極のガイド

In architectural lighting, commercial lighting, and residential lighting projects, reliability and durability are often just as important as brightness and aesthetics. One of the most common causes of failure for LED strips in real-world applications is inadequate waterproofing, dustproofing, or weatherproofing. A strip that looks perfect in a showroom can fail after just a few months outdoors due to moisture ingress or aging if not properly protected.

Whether for indoor installations (requiring moisture and splash resistance) or outdoor projects (demanding protection against rain, UV exposure, and temperature fluctuations), selecting the correct waterproofing method is critical. From IP ratings and adhesive choices to waterproofing materials (such as silicone, epoxy, or nano-coatings), every aspect impacts the strip’s lifespan and maintenance costs.

This guide systematically covers core knowledge and applications of waterproof LED strips, including:

• Why LED strips require waterproofing and scenarios where it’s essential
• Differences between indoor and outdoor applications
• Common and emerging waterproofing techniques and materials, like nano-coatings
• Understanding and applying IP rating standards
• The role of adhesive backing and installation methods in waterproofing, especially 3M VHB tape
• Selection steps and recommended applications for outdoor waterproof LED strips
• Additional lesser-known facts about waterproof LED strips

By reading this ultimate guide, you’ll gain a comprehensive framework to select, install, and maintain highly reliable waterproof LED strips across diverse environments, ensuring long-term stable performance for your projects.

Why Do LED Strip Lights Need Waterproofing?

In practical applications of LED strip lights, waterproofing is not merely an optional feature but a critical factor determining longevity and performance.

1. Preventing Electrical Failures and Safety Hazards

LED strip lights are essentially electronic devices. When exposed to damp or dusty environments, they are highly susceptible to short circuits, flickering, or complete failure. Without waterproof protection in outdoor or high-humidity spaces, the strip may not only become unusable but also pose potential safety hazards.

2. Extend Service Life and Reduce Maintenance Expenses

Installing a light strip is not a one-time investment. For commercial lighting or large-scale construction projects, labor costs for maintenance and replacement often far exceed the strip’s purchase price. Reliable waterproofing effectively prevents frequent replacements caused by water ingress, moisture damage, or aging, thereby lowering long-term operational expenses.

3. Maintain Brightness and Aesthetic Appeal

Moisture, dust, and contaminants not only compromise circuitry but also cause LED chips to yellow, diminish brightness, or develop surface discoloration. Particularly in outdoor applications, inadequate waterproofing can lead to noticeable light decay within months, undermining the overall lighting effect.

4. Indoor vs. Outdoor: Scenario-Specific Requirements

Indoor Applications: In areas like kitchens, bathrooms, and bar counters, light strips require basic moisture resistance and splash protection to ensure long-term stability.

Outdoor Applications: On building facades, in gardens, poolside areas, or on advertising signs, light strips must withstand challenges from rain, UV exposure, and temperature fluctuations. These environments demand higher waterproof ratings and superior material weather resistance.

For these reasons, selecting waterproof LED light strips requires careful consideration of the usage environment and protection rating. In the next section, we will provide a detailed comparison to help you identify the optimal choice for different scenarios.

Indoor vs. Outdoor Waterproof LED Strip Applications

Significant differences exist between indoor and outdoor waterproofing requirements. When selecting LED strips, one cannot simply assume that “any waterproofing will suffice.” Instead, the required protection rating and manufacturing process must be determined based on the installation location and application scenario.

1. Indoor Application Scenarios: Primarily Moisture and Splash Resistance

Although most indoor environments are relatively dry, many areas still experience humidity, moisture, or occasional liquid contact:

• キッチン: Strip lights installed under cabinets or along counter edges frequently encounter steam and cooking fumes.
• Bathrooms/Washrooms: Lights near mirrors, ceilings, or sinks require moisture resistance and splash protection.
• Bars/Commercial Food Service Areas: Countertop strips must withstand beverage spills and cleaning moisture.

In these scenarios, basic IP20 to IP54 protection suffices, focusing on preventing vapor ingress and accidental splashes. Here, strips should maintain flexibility and consistent light output without excessive protective burden.

2. Outdoor Applications: Comprehensive Protection and Weather Resistance

Outdoor environments are far more complex than indoor settings, demanding higher waterproofing and weather resistance from LED strips:

• Building facades and landscape lighting: Requires prolonged exposure to rain, wind, sand, and UV radiation.
• Gardens, patios, and courtyards: Often used for pathways, lawn edging, or decorative lighting, requiring resistance to moisture and rain erosion.
• Pool and fountain areas: Subject to splashing water or even prolonged immersion, demanding IP67 or IP68 ratings.
• Billboards and outdoor signage: Continuous operation demands exceptional reliability and minimal maintenance costs.

In these scenarios, protection extends beyond waterproofing to address UV degradation, temperature fluctuations, dust, and chemical corrosion. This necessitates higher-grade waterproofing materials and techniques, such as silicone potting, epoxy encapsulation, or nano-coating technology.

3. Key Selection Principles

• Indoor → Lightweight Protection: Emphasizes cost-effectiveness and installation convenience.
• Outdoor → Heavy-Duty Protection: Prioritizes long-term reliability and environmental adaptability.

In other words, “waterproofing” isn’t a one-size-fits-all standard—it requires selecting the most appropriate level and process based on the application scenario. Next, we’ll compare the pros and cons of different waterproofing techniques to help you make an informed choice.

Waterproofing Technologies for LED Strip Lights

In the waterproof design of LED strip lights, the selection of processes and materials determines the final protective effectiveness and lifespan. Common waterproofing techniques currently include spray coating, drop-glue, hollow sleeve, sleeve potting, extrusion, and the emerging nano-coating technology. Each method has its own advantages and disadvantages, making them suitable for different installation environments and budget requirements.

Comparison of Waterproofing Processes for LED Strip Lights

Process Type	メリット	デメリット	Typical Protection Rating	Recommended Applications
Spray Coating	Thin protective layer (~30–50 µm), minimal light transmission change	Splash-proof only, IP54+; suitable for mildly humid environments	IP54	Bathrooms, kitchens, indoor mildly humid and splash-proof applications
Drop-Glue	Simple process, low cost, moderate flexibility	Approx. 2 mm thickness, affects heat dissipation and color temperature; prone to yellowing over time	IP65–IP67	Indoor damp areas, hotels, offices, etc.
中空の袖	Excellent structural flexibility, suitable for curved installations	Prone to oxidation affecting light stability; condensation risk in cold zones	IP66	Curved decorative areas, semi-outdoor routine lighting
スリーブポッティング	Fully enclosed; strong waterproof and dustproof performance	Poor heat dissipation, high material costs	IP67–IP68	Poolside, underwater, or high-humidity long-term environments
押出	High protection, high production efficiency	High equipment costs	IP67–IP68	Massive continuous high-durability outdoor scenarios
PECVD Nano-Coating	Ultra-thin nanoscale coating, lightweight, excellent heat dissipation	Complex process, high cost	IP65–IP66	New lightweight, high-transparency, highly flexible lighting applications

1. Spray Coating Process

The spray coating process uses a spray applicator to evenly coat the surface of LED strips with adhesives like silicone, forming a thin, uniform protective layer. This method is suitable for environments with moderate waterproofing requirements, such as dry or slightly humid areas like kitchens and bathrooms. The sprayed coating typically ranges from 30 to 50 microns in thickness, offering good light transmission and water resistance.

2. Drop-Glue Process

The drop-glue process employs high-precision dispensing machines that move along the PCB path of the light strip, evenly depositing adhesive onto its surface to form a semi-circular protective layer. Common adhesive types include epoxy resin, polyurethane, and silicone.

Further Reading: How to Choose the Glue for the Waterproof LED Strip.

3. Hollow Sleeve Process

This method involves encasing the light strip within a transparent silicone/PVC sleeve to create a physical barrier. Suitable for indoor settings with moderate waterproofing needs (e.g., living rooms, bedrooms), it offers simple installation and low cost but provides limited water resistance.

4. Sleeve Potting Process

Building upon hollow conduit techniques, the potting process involves uniformly injecting potting compound into the conduit to form a fully enclosed protective layer. This method is suitable for environments demanding exceptional waterproofing, such as outdoor landscape lighting and billboards. Commonly used adhesives include epoxy resin and silicone, offering superior waterproofing, dustproofing, and UV resistance.

5. Extrusion Process

The extrusion process involves co-extruding the light strip and thermoplastic material through a mold to form a protective layer with a specific shape. This method is suitable for mass-producing waterproof LED light strips, offering high efficiency and consistency. Common materials include PVC and silicone, providing excellent waterproof performance.

6. PECVD Nano-Coating Process

The PECVD Nano-Coating Process is an emerging waterproofing technology that deposits a nanoscale protective film on strip light surfaces via Plasma-Enhanced Chemical Vapor Deposition (PECVD). This method is ideal for scenarios demanding exceptional waterproofing while maintaining strip flexibility, such as outdoor advertising and architectural facade lighting. The nano-coating offers superior waterproofing, dust resistance, and UV protection with minimal impact on luminous efficacy.

Learn More: LED ストリップ ライトの新しい防水技術 - ナノ コーティング.

The comparison above indicates:

• Lightweight protection → Indoor or partially humid environments; spray adhesive or hollow tubing may suffice

• Moderate protection → Damp environments; potting compound is adequate

• Heavy-duty protection → Outdoor or long-term use environments; potting, extrusion, or nano-coating is recommended

Therefore, selecting the appropriate waterproofing process requires comprehensive consideration of the specific application scenario, budget, and protection level requirements. Different waterproofing processes suit varying environments and needs. Choosing the right process effectively extends the lifespan of LED strips and ensures stable operation across diverse conditions.

For detailed information on these waterproofing processes, read our blog: What Are the Waterproofing Processes Used in LED Strip Lights?

IP Ratings Explained—Which One Is Right for Your LED Strips?

What’s the Difference Between IP20, IP65, IP67, and IP68?

IP等級	Protection Capability	典型的なアプリケーションのシナリオ	メリット	制限事項
IP20	Basic dust protection, no water resistance	Indoor dry environments (living room, bedroom, cabinet lighting)	Low cost, good heat dissipation, easy installation	Not waterproof; unsuitable for damp or outdoor use
IP65	Dust-tight, resistant to low-pressure water jets	Kitchens, bathrooms, balconies, semi-outdoor environments	Withstands steam and splashes; suitable for indoor/outdoor use	Not suitable for prolonged submersion
IP67	Dust-tight, withstands short-term submersion (≤30 minutes, ≤1 meter)	Outdoor courtyards, billboards, facade lighting	Withstands heavy rain and temporary water accumulation, high reliability	Not suitable for long-term submerged applications
IP68	Completely dustproof, capable of long-term submerged operation (>1 meter)	Pools, fountains, water feature projects, coastal installations	Highest protection, suitable for extreme environments	High cost, poor heat dissipation, demanding installation requirements

How to Match IP Rating with Different Applications

• Indoor dry environments → Choose IP20. Examples: Living room ambient lighting, TV backdrop light strips. No waterproofing required, better heat dissipation, lowest cost.

• Indoor humid environments → Choose IP65. Examples: Bathroom mirror lights, kitchen ceiling light strips. Resists water vapor and occasional splashes.

• General outdoor environments → Choose IP65 or IP67. Examples: Garden path lighting, building facade decorations. IP65 suits semi-exposed areas, while IP67 handles full-weather exposure.

• Underwater or extreme environments → Choose IP68. Examples: Pool edge lighting strips, fountains, and coastal installations. Operates reliably in prolonged immersion and high humidity.

Project Tip: For outdoor installations where light strips are concealed in channels or housed in protective enclosures, consider using IP65 instead of IP67/68 to reduce costs.

Choosing the Right IP Level for Long-Term Reliability

Selecting the appropriate IP rating not only meets environmental requirements but also ensures light strip longevity and minimizes maintenance costs.

1. Avoid Over-Engineering: For instance, using IP68 strips in living rooms offers superior protection but incurs higher costs and reduced heat dissipation—counterproductive.

2. Avoid Under-Protection: Installing IP20 strips outdoors may work briefly but will quickly fail due to moisture or rain corrosion, potentially creating electrical hazards.

3. Balance cost and durability: Precisely matching the IP rating to the application achieves the optimal balance between lifespan and cost. For example:- Under-eave lighting → IP65 is sufficient – Wide-area landscape lighting → IP67 recommended – Pool lighting → IP68 required

In summary, correctly understanding IP ratings and selecting them based on practical applications not only extends the lifespan of LED strips but also reduces maintenance and replacement costs. This is essential knowledge for all lighting contractors and DIY users.

Adhesive & Mounting Solutions for Waterproof LED Strips

In LED strip installations, adhesive and mounting solutions are often underestimated, yet they directly determine the strip’s long-term stability, waterproof performance, and maintenance costs. Whether in humid indoor environments or harsh outdoor weather, a high-quality adhesive solution not only prevents the strip from detaching but also avoids short circuits, corrosion, or premature damage caused by water ingress through gaps.

Why Does Adhesive Strength Matter for Waterproof Performance?

In waterproof LED strip applications, the importance of adhesive strength cannot be overlooked:

1. Prevents Edge Lifting: If strip edges lift, rainwater, dust, or atmospheric moisture can easily infiltrate, compromising the waterproof layer and reducing protection ratings.

2. Extends Lifespan: Strong adhesion minimizes cracks caused by uneven stress on the waterproof layer, ensuring stability for LED chips and circuit boards.

3. Reduces Maintenance Costs: Poorly installed strips prone to detachment or leaks require frequent inspections and replacements, increasing labor and material expenses.

4. Ensures Safety: Unstable installations heighten short-circuit risks, significantly increasing safety hazards in high-humidity environments or long-term outdoor exposure projects.

チップ: In outdoor or humid settings, even with IP67/IP68 waterproof ratings, high-strength bonding is essential for truly reliable waterproofing.

Is 3M Tape Really the Best Choice for LED Strip Installation?

3M VHB vs Standard Double-Sided Tape: Which One Lasts Longer?

Tape Type	特徴	アプリケーション
3M VHB (Very High Bond)	Exceptional initial bonding strength, replaces mechanical fasteners like screws and rivets; UV-resistant, corrosion-resistant; withstands extreme temperatures	Outdoor billboards, building facades, large-scale engineering lighting, landscape illumination projects
Standard Double-Sided Tape	Low cost, easy installation; moderate adhesion, poor weather resistance	Indoor dry environments, short-term decorative light strip installations

Actual Comparison:

• In high-temperature, strong UV, or humid environments, standard double-sided tape easily degrades and peels off; 3M VHB maintains stable adhesion over time, ensuring waterproof layer integrity.

• For large-scale projects or long-term outdoor installations, 3M VHB can even replace certain mechanical fastening methods, reducing construction complexity.

Best Practices by Application Type

• Standard indoor environments → Standard 3M tape suffices, offering low cost and easy installation.

• Humid indoor/light outdoor environments → Opt for high-grade 3M tape with heat resistance and moisture protection for long-term stability.

• Long-term outdoor/engineering projects → Mandatory use of 3M VHB ensures safety, durability, and minimized maintenance.

Engineering Tip: In outdoor or high-humidity environments, besides selecting high-tack tape, also note:

• Installation surfaces must be clean, dry, and free of grease.
• Apply even pressure on both sides of the tape to maximize bonding area.
• For critical joints, corners, or bends, add auxiliary fastening (e.g., silicone sealant).

Further Reading: Best Quality Adhesive Tape for LED Strip.

In summary, adhesive and mounting solutions are critical factors in waterproof LED strip installations. High-quality tape not only secures the strips but also extends the lifespan of the waterproofing layer and reduces long-term maintenance costs. Selecting the appropriate tape type and employing proper installation methods are essential steps in creating a reliable LED lighting system.

How to Choose the Best Outdoor Waterproof LED Strip Lights

Outdoor environments pose far greater challenges to LED strips than indoor settings: rain, dust, UV exposure, extreme temperature fluctuations, and constant weathering all impact strip performance and lifespan. Selecting the right outdoor waterproof LED strip not only affects lighting quality but directly influences project durability, maintenance costs, and customer satisfaction.

A Step-by-Step Guide to Selecting Outdoor LED Strips

To help contractors and wholesale clients quickly identify suitable outdoor lighting solutions, here’s a practical step-by-step guide:

1. Identify the Application Scenario

• Landscape Lighting: Courtyards, gardens, pathway lighting
• Building Facades: Commercial buildings, hotel exteriors, cultural landmarks
• Signage & Advertising: Outdoor advertisements, directional signs
• Pools & Fountains: Underwater strips, decorative illumination
• Public Spaces & Outdoor Projects: Squares, commercial streets, outdoor installations

2. Select the Appropriate IP Rating

• Minimum requirement: IP65, suitable for semi-outdoor environments or light rain conditions
• Humid environments or temporary immersion → IP67 recommended
• Long-term immersion or underwater installation → IP68 mandatory

3. Select Waterproofing Pプロセス

• Epoxy Resin / Glue Potting: High protection, suitable for fixed-shape strips
• Silicone Extrusion/Encapsulation: Excellent flexibility, bendable to conform to curved surfaces
• Nano Coating: Thin-film waterproofing preserves the strip light’s slim profile and heat dissipation.

4. Matching Brightness and Color Temperature

• Outdoor environments typically have ample ambient light, requiring higher brightness.
• Color temperature selection: Warm white (2700–3000K) for landscape ambiance; cool white (5000–6000K) for commercial or security lighting

5. Verify Power Supply and Control Methods

• Waterproof power supplies recommended for outdoor projects
• Support for DMX, DALI, or wireless smart control enables dynamic effects and remote management.

6. Confirm Mounting and Fixing Solutions

• High-strength 3M VHB tape ensures long-term waterproofing and adhesion.
• Alternatively, use aluminum channels/clips for mounting to enhance durability and installation stability.

Expert Advice: In complex outdoor environments, matching installation methods with waterproofing techniques is more critical than simply increasing IP ratings for extending strip lifespan.

For detailed outdoor waterproof LED strip selection guidance, read our blog: 屋外用防水LEDストリップライトを選ぶ6つのステップ.

Top 5 Outdoor Applications and the Best LED Strip Options

Select the most suitable waterproof LED strip type for different outdoor scenarios:

For more selecting waterproof LED strip lighting products, click 5 さまざまなアプリケーションに最適な屋外LEDストリップライト.

For long-term outdoor projects, IP rating, installation method, and waterproofing technology must be considered simultaneously. Failure in any one aspect may shorten service life. Therefore, choosing outdoor waterproof LED strips requires more than just checking “waterproof” status—it demands a comprehensive evaluation of:

• アプリケーション・シナリオ
• IP Rating and Waterproofing Technology
• 明るさと色温度
• Power Supply and Control System
• Adhesive or Mounting Method

Only by doing so can you ensure your LED strip lights remain safe, reliable, vibrant, and durable in outdoor environments over the long term.

Additional Knowledge for Waterproof LED Strips

In the design of integrated extrusion waterproof LED strips, materials significantly impact both waterproofing effectiveness and strip longevity. Additionally, the choice of flexible PCB structure determines the waterproofing process applicable to the strip. Understanding these technical details helps engineers, project managers, and wholesale clients make more precise purchasing decisions.

Extrusion Waterproof Materials: Fumed Silicone vs Precipitated Silicone vs Silicone

In the integrated extrusion waterproofing process, the materials used directly determine the strip’s waterproof performance, flexibility, and weather resistance. The following provides a comparative reference:

Comparison Dimensions	Fumed Silicone	Precipitated Silicone	Silicone Material (Base)
Technical Characteristics	Silica forms a protective layer via vapor deposition on the light strip surface	Silica coats LEDs through solution precipitation	Silicone is extruded into tubular or cover forms
メリット	Thin and uniform, preserves light strip flexibility, excellent heat dissipation	Mature process, reliable waterproofing	High protection, waterproof, dustproof, UV resistant
デメリット	Higher initial cost, complex production process	Relatively thicker, slightly reduced flexibility when bending	Slightly lower heat dissipation, increased thickness
Reinforcement Performance	Excellent, nano-scale particle size, good dispersion	Average, larger particle size, poor reinforcement	Dependent on fillers
Mechanical Strength	High (high tensile strength, tear strength)	中程度	Softer, low strength
Transparency	Transparent/translucent (suitable for optical applications)	Semi-translucent/opaque	Opaque
Compression Set (Permanent Deformation)	Low, fatigue resistant	Significant	平均
High/Low Temperature Resistance	Excellent (-60°C to 200°C)	グッド	平均
Aging/Weather Resistance	グッド	貧しい	平均
Processing Difficulty	High dispersion difficulty, high cost	Easy processing, low cost	Easy molding
コスト	高い	ミディアム	低い
代表的なアプリケーション	Highly flexible curved light strips, architectural decoration, automotive interiors	Indoor humid areas, semi-outdoor installations	Outdoor billboards, pool lighting strips, extreme environments

Flexible PCB Types: Plated Board vs Die-Cut Board vs Mesh Board

The quality of flexible PCBs in LED strips is a critical factor in ensuring the long-term reliability of waterproof strips and their manufacturing processes. The three common flexible PCB processes/structures are:

Comparison Dimensions	Plated	Die-Cut Board	Mesh Board
Process Characteristics	Plating + Photolithography + Etching, high precision	Stamping / Laser Cutting, simple process	Mesh / Openwork Design, lightweight structure
Circuit Precision	Extremely high, <50μm possible	Lower, limited by die/laser	General, more structural functionality
Mechanical Properties	High flexibility, repeatable bending	Average, multiple stress points from punching	Optimal, superior flexibility and heat dissipation
信頼性	High, strong adhesion	Average, stress concentration at punching points	Moderate, depends on design and copper foil retention
放熱	平均	平均	Good (cutouts aid heat dissipation)
Weight	Standard	Standard	Lighter (reduced material)
コスト	High (complex processes)	Low (suitable for high volume)	Medium (requires specialized design)
代表的なアプリケーション	Excellent adhesion to waterproof layers, high-brightness outdoor light strips	Requires high-quality waterproof layers, lightweight or curved light strips	Requires attention to seal hole positioning when combined with waterproof layers, slightly reduced waterproof performance

Key Takeaways for Buyers

1. Material Selection Determines Waterproof Reliability

• Fumed silicone and silicone extrusions suit outdoor and highly flexible applications.
• Precipitated silicone are suitable for indoor humid environments.

2. Flexible PCBs Form the Foundation of Waterproofing Processes

• Electroplated boards offer superior waterproofing and durability.
• Die-cut and perforated boards require high-quality waterproof layers for long-term stability.

3. Holistic Consideration of Materials and PCB Structure

• The lifespan and maintenance costs of waterproof LED strips depend not only on encapsulation techniques but also on PCB quality.
• For engineering projects, selecting premium materials and reliable PCBs is crucial for ensuring the long-term success of outdoor installations.

Understanding waterproof material types and flexible PCB processes helps buyers strike the optimal balance between budget, performance, and project environment. This prevents waterproofing failures, reduced strip lifespan, or high maintenance costs caused by improper material or PCB selection.

Conclusion – Building Reliable Indoor & Outdoor LED Strip Projects

Waterproof LED strips play a crucial role throughout the entire lighting system. Whether for indoor or outdoor applications, selecting the appropriate waterproof rating, manufacturing process, and installation solution is essential to ensure project stability and longevity.

Key Takeaways for Selecting Waterproof LED Strips:

• IP rating is the primary threshold → IP20 suffices for dry indoor environments; IP65 or higher is recommended for outdoor or damp areas; IP68 is required for prolonged underwater use.

• The waterproofing process determines durability. Silicone extrusion, potting, and nano-coating each offer distinct advantages; selection must align with specific scenarios.

• Installation and adhesion are critical → 3M tape and 3M VHB are optimal choices to prevent compromise of waterproofing.

• Match applications to environments: Gardens, pools, billboards, and building facades each have corresponding optimal strip solutions.

As a professional LED strip manufacturer, SignliteLED not only provides high-quality waterproof LED strip products but also offers OEM/ODM customized solutions tailored to customer needs:

• Diverse waterproofing techniques → Catering to various applications (indoor/outdoor/underwater)
• High-performance adhesive solutions → 3M & VHB tapes ensure stability
• Smart control compatibility → Supports Wi-Fi, Bluetooth, and Zigbee for seamless integration into smart home systems
• Long-term warranty and support → Reduces customers’ ongoing maintenance costs

Whether you are a lighting contractor, brand owner, or seeking a reliable OEM/ODM partner, SignliteLED delivers stable, durable, and customizable waterproof LED strip lighting solutions for your projects.