Many installers assume that a 24V COB LED strip can run as far as needed from a single power feed. In reality, every LED strip has a maximum practical run length determined by PCB resistance, copper thickness, power density, and manufacturing design.

For most standard 24V COB LED strips, the recommended maximum continuous run length from a single power feed is approximately 5 meters. Beyond this distance, voltage drop may cause visible brightness reduction, reduced uniformity, and color shift at the far end of the strip.

However, some advanced reel-to-reel (R2R) 24V COB LED strips are specifically designed for longer continuous runs. Thanks to optimized PCB design, improved copper conductivity, and enhanced manufacturing processes, these products can achieve maximum continuous run lengths of 10–15 meters while maintaining acceptable brightness consistency.

As a result, the maximum run length of a 24V COB LED strip is not determined by voltage alone. Product design and manufacturing quality play an equally important role in long-distance performance.

The exact distance depends on four key variables:

• Vermogensdichtheid (W/m)
• PCB width
• dikte koper
• Acceptable brightness uniformity

A low-power 7W/m strip may operate close to 10 meters from one end, while a high-output 24W/m strip may require power injection before reaching 7 meters.

In commercial projects such as hotel coves, retail displays, museum lighting, and architectural facades, voltage drop is often the factor that determines wiring design, stroomvoorziening sizing, and whether additional injection points are required.

This guide provides practical run-length recommendations, explains the engineering principles behind voltage drop, shows how to calculate the maximum usable length, and includes real project examples used by lighting professionals. For guidance on selecting 24V COB LED strips for indoor and outdoor applications — including IP ratings, mounting options, and environmental requirements — refer to our dedicated indoor vs. outdoor COB LED strip guide.

Quick Design Rules

For readers who need an immediate answer:

✔ For standard 24V COB LED strips, keep single-end runs within 5m. For R2R-optimized COB strips, the limit extends to 8m at 10W/m with standard 1oz copper. 

✔ Apply a 1.25× power supply sizing factor to all installations.

✔ Consider 2oz copper PCBs when run length approaches design limits.

✔ For projects exceeding 15m continuous runs, evaluate 48V COB LED strips instead of adding multiple injection points.

These four rules alone eliminate the majority of voltage-drop-related problems encountered in commercial LED strip installations.

Quick Answer: Maximum Run Length by Configuration

For R2R-manufactured 24V COB LED strips, a single power feed can support runs of 7–10 meters depending on power density and PCB specification. For standard COB strips, the practical limit is closer to 5 meters. The table below shows engineering maximums for R2R configurations based on a 1.5V terminal voltage drop threshold. 

The table below provides practical engineering limits based on a maximum terminal voltage drop of 1.5V (6.25%), which is generally accepted as the threshold where brightness differences begin to become visible in architectural and commercial lighting applications.

The values below reflect engineering maximums based on PCB resistance calculations. Standard COB LED strips are typically recommended for runs up to 5m; R2R-manufactured strips with optimized PCB design can achieve the longer distances shown. 

Vermogensdichtheid	PCB Breedte	dikte koper	Maximum Single-End Run	Recommended Design Run	With Center Injection	Typische toepassing
7W/m	8mm	1oz	10m	9m	~20m	Cove lighting, display cabinets
8W/m	8mm	1oz	10m	8.5m	~20m	Retail shelving, under-cabinet lighting
10W/m	8mm	1oz	9m	7.5m	~18m	Hotel, office, architectural lighting
10W/m	5mm	1oz	7m	6M	~14m	Narrow-profile signage
11W/m	8mm	1oz	8.5m	7m	~17m	Hospitality corridors
12W/m	8mm	1oz	8M	7m	~16m	High-output commercial lighting
14W/m	10 mm	1oz	8.5m	7m	~17m	Facade illumination
24W/m	12 mm	1oz	7m	6M	~14m	Ultra-high-output installations

The distances shown in this guide are based on:

• Standard 24V constant-voltage systems
• 20°C ambient temperature
• Industry-standard PCB resistance values
• 1oz copper foil unless otherwise specified
• Installation practices aligned with IPC conductor-design principles

Actual performance may vary depending on:

• PCB trace layout
• Connector quality
• Solder joint resistance
• Driver voltage tolerance
• Ambient operating temperature

For critical commercial installations, voltage-drop calculations should always be verified before final specification.

Many LED strip guides only provide a single distance figure, which can be misleading.

• Maximale looplengte = the distance at which terminal voltage reaches the acceptable engineering threshold.
• Recommended Run Length = a conservative design value that includes a safety margin for temperature rise, connector resistance, power supply tolerance, and installation variables.

For professional projects, recommended run length should always be used during design and quotation stages.

One of the most common questions installers ask is:

“How should I wire my LED strip based on the total run length?”

One of the most common questions installers ask is how to wire based on total run length: 

• 0–5m: Single-end feed is sufficient for most standard COB strips
• 5–8m: Single-end feed with voltage drop calculation recommended
• 8–15m: Center injection
• 15–25m: Multiple injection points
• 25m+: Consider 48V COB LED strips

For standard COB LED strips, treat 5m as the single-end design limit. The 5–8m range applies to R2R strips or configurations with 2oz copper. 

What Causes Voltage Drop in Long LED Strip Runs?

Voltage drop is the primary factor that limits how far a COB LED strip can be powered from a single supply point.

Many installers assume the LEDs themselves determine the maximum run length. In reality, the limitation comes from the copper conductors inside the PCB. As current travels through the copper traces, electrical resistance converts part of the energy into heat. The longer the strip, the more resistance accumulates, and the lower the voltage available at the far end.

This is why a strip that appears perfectly bright at 3 meters may show noticeable brightness reduction, color shift, or flickering when extended to 10 meters or beyond.

The following four variables determine how quickly voltage drops along a run: 

veranderlijke groot	Effect on Voltage Drop
Current (A)	Higher current increases voltage drop
Run Length (m)	Longer distance increases voltage drop
PCB Resistance (Ω/m)	Higher resistance increases voltage drop
dikte koper	Thicker copper reduces voltage drop

Because these variables interact with each other, voltage drop increases much faster than most installers expect.

For a uniformly loaded COB LED strip, voltage drop can be estimated using:

waar:

• ΔV = Voltage drop at the far end (V)
• I/m = Current draw per meter (A/m)
• R/m = PCB loop resistance per meter (Ω/m)
• L = Strip length (m)

The division by two accounts for the fact that LEDs are distributed continuously along the strip rather than concentrated at a single point.

This formula is far more accurate for LED strip design than the simple wire-voltage-drop equations commonly found online.

How to Calculate Voltage Drop on a 24V COB LED Strip

Let’s use a common commercial specification:

• Power Density = 10W/m
• Voltage = 24V
• PCB Width = 8mm
• Copper Thickness = 1oz

Step 1 — Calculate Current per Meter

Working current = 10W ÷ 24V = 0.417 A/m  

Step 2 — Determine PCB Resistance

PCB loop resistance for 8mm, 1oz = 0.09 Ω/m (see reference table below) 

PCB Loop Resistance Reference Table

PCB Breedte	Loop Resistance (1oz)	Loop Resistance (2oz)
5mm	0.14 Ω/m	0.07 Ω/m
8mm	0.09 Ω/m	0.045 Ω/m
10 mm	0.072 Ω/m	0.036 Ω/m
12 mm	0.060 Ω/m	0.030 Ω/m

Step 3 — Calculate Actual Voltage Drop 

Lengte	spanningsval	Status
5 m	0.47V	✓ Excellent
8M	1.20V	✓ Acceptable
9m	1.52V	⚠ Threshold
10m	1.88V	✗ Visible drop likely
12m	2.70V	✗ Power injection required

This demonstrates why a typical 10W/m COB strip reaches its practical limit around 8–9 meters when powered from a single end. 

One of the biggest misconceptions in LED strip design is that voltage drop increases linearly.

It does not.

Because both current distribution and conductor resistance are involved, voltage drop accelerates as length increases.

A useful way to visualize this is with a chart.

This chart is highly effective because readers can instantly identify when power injection becomes necessary without performing calculations.

The formula can also be rearranged to calculate maximum allowable length directly:

Using:

• Maximum allowable drop = 1.5V
• Current = 0.417A/m
• Resistance = 0.09Ω/m

The result becomes:

L(max) ≈ 8.9m

This value aligns closely with field experience from commercial COB LED strip installations.

Why Does 24V Run Longer Than 12V?

One of the most common questions buyers ask when comparing LED strip systems is:

Why can a 24V COB LED strip run much farther than a 12V strip, even when both have the same wattage?

The answer comes down to one fundamental electrical principle:

Higher voltage means lower current. Lower current means less voltage drop.

Since voltage drop is the primary factor limiting LED strip run length, increasing system voltage directly improves long-distance performance.

For the same power density:

• A 24V COB LED strip typically runs 1.8–2× farther than a comparable 12V strip.
• A 48V COB LED strip typically runs 2× farther than a comparable 24V strip.
• Voltage drop decreases dramatically as operating voltage increases.

Dit is waarom:

• 12V dominates short decorative installations.
• 24V dominates commercial and architectural projects.
• 48V is increasingly used for ultra-long continuous lighting runs.

For a comprehensive comparison of how these voltage levels affect run length, brightness, and overall system design, see our complete guide on 12V vs 24V LED strip systems.

Current draw per meter is calculated as: 

At the same power density of 10W/m, a 12V strip draws 0.833A/m, a 24V strip draws 0.417A/m, and a 48V strip draws only 0.208A/m. Each doubling of voltage cuts current in half — and because voltage drop scales with current through the distributed-load relationship, halving current reduces voltage drop by approximately 75%. 

Doubling again from 24V to 48V cuts current in half again.

Because conductor losses are heavily dependent on current, this has a major impact on usable run length.

Voltage Drop Comparison: 12V vs 24V vs 48V

Using the same:

• 10W/m power density
• 8mm PCB
• 1oz copper
• 8-meter run

The results are dramatically different.

specificatie	12V	24V	48V
Vermogensdichtheid	10W/m	10W/m	10W/m
Current per Meter	0.833 A/m	0.417 A/m	0.208 A/m
Voltage Drop @ 8m	~4.8V	~1.2V	~0.3V
Percentage Drop	40%	5%	<1%
Recommended Single-End Run	~4m	~7.5m	~15–20m
Typische toepassing	decoratief	handels-	Long-run Architectural

This table illustrates why voltage selection is often more important than the strip itself when designing long-distance lighting systems.

Which COB LED Strip Voltage Is Best for Long Runs?

The answer depends on project requirements.

• Under 5m: 12V is sufficient
• 5–15m: 24V is the standard choice
• 15–25m: 48V becomes more practical
• Above 25m: 48V with injection strategy
• Premium uniformity or large architectural: 24V or 48V depending on run length

If a project is being designed from scratch, selecting the correct voltage early often reduces installation cost more effectively than solving voltage-drop problems later.

For a detailed breakdown of the trade-offs involved in choosing between 12V and 24V LED strip systems, including driver availability, controller compatibility, and cost considerations, refer to our full selection guide.

24V vs 48V: Which Is Better?

Many buyers automatically assume 48V is always better.

That is not necessarily true.

Advantages of 24V

• Widely available drivers
• Lower system cost
• Broad controller compatibility
• Easier sourcing
• Industry-standard specification

Advantages of 48V

• Longer continuous runs
• Fewer injection points
• Better brightness consistency
• Lower conductor losses
• Cleaner installation aesthetics

For projects below 15 meters, 24V is typically the most economical choice.

For projects above 15 meters, 48V often becomes the more efficient engineering solution.

A simple rule used by many lighting engineers is:

Lengte	Preferred Strategy
Under 8m	24V Single-End Feed
8–15m	24V Center Injection
15–20m	Evaluate 48V
20m+	48V Recommended

This approach minimizes wiring complexity while maintaining brightness uniformity throughout the installation.

What Is the Longest Run Length for Different 24V COB LED Strip Configurations?

There is no single maximum run length that applies to every 24V COB LED strip.

The achievable distance depends on a combination of:

• Vermogensdichtheid (W/m)
• PCB width
• dikte koper
• Brightness uniformity requirements
• Ambient temperature
• Wiring method

This is why two products that are both labeled “24V COB LED Strip” may perform very differently in real-world installations.

PCB width directly affects run length through its impact on trace resistance. Relative to a 5mm PCB baseline, an 8mm PCB increases practical run length by approximately 25%, a 10mm PCB by 40%, and a 12mm PCB by 55%. For projects where installation access is limited, specifying a wider PCB at the sourcing stage is often more cost-effective than retrofitting injection points later. For a complete overview of LED strip PCB width selection, including profile dimensions, beam angle, and mounting considerations, refer to our dedicated width selection guide.

For projects where installation access is difficult, selecting a wider PCB often reduces overall project cost.

How Copper Thickness Affects Maximum Run Length

Copper thickness is one of the most overlooked specifications in the LED strip industry.

Most buyers compare:

• Spanning
• Wattage
• CRI
• CCT

Very few compare:

• Copper weight

Yet copper thickness directly determines conductor resistance.

specificatie	1oz Copper	2oz Copper
dikte koper	35μm	70μm
tegenweer	100%	~50%
spanningsval	100%	~50%
Maximale looplengte	100%	~140%
Additional Wiring Required	Yes (often)	Less frequently

This single specification change often eliminates the need for center injection in medium-length installations.

Signs That Voltage Drop Is Becoming a Problem

Voltage drop rarely causes an LED strip to fail suddenly.

Instead, performance gradually deteriorates as the voltage available at the far end decreases. In many projects, installers notice symptoms long before they realize voltage drop is the root cause.

Understanding these warning signs allows problems to be identified and corrected before project handover, avoiding costly troubleshooting and customer complaints.

The following symptoms indicate that voltage-drop limits are being approached: 

✓ Brightness becomes weaker toward the end of the strip

✓ Color temperature changes along the run

✓ The far end flickers intermittently

✓ Sections switch off unexpectedly

✓ Measured voltage at the far end falls below 22.5V

In professional installations, these symptoms almost always indicate that voltage-drop limits are being approached or exceeded.

The following table connects common field symptoms to their likely causes and recommended solutions: 

This table provides a fast diagnostic guide used by many installers during commissioning and troubleshooting.

teken	Most Likely Cause	Aanbevolen oplossing
End of strip appears dimmer	Voltage drop exceeds design threshold	Add power injection
Uneven brightness along run	Excessive conductor resistance	Shorten run or inject power
Color temperature shift	Supply voltage variation across strip	Reduce voltage drop
Far end flickers	Voltage below operating threshold	Add injection point
Strip shuts off intermittently	Driver undervoltage protection	Verify voltage and power supply sizing
Entire installation unstable	Overloaded power supply	Increase PSU capacity
Brightness changes after warm-up	Temperature-induced resistance increase	Improve wiring design

This format is useful because it connects visible field symptoms directly to engineering solutions.

When Is Power Injection Required?

Power injection becomes necessary when the voltage available at the far end of the constant voltage LED strip systems falls below the level required to maintain consistent brightness and stable operation.

While many installers use fixed distance rules such as “inject every 5 meters” or “inject every 10 meters,” these rules are often inaccurate because they ignore the strip’s actual power density, PCB specification, and uniformity requirements.

The correct engineering approach is to determine whether voltage drop exceeds the project’s acceptable threshold.

For most professional 24V COB LED strip installations:

• Voltage drop below 1.0V is considered excellent.
• Voltage drop between 1.0V and 1.5V is generally acceptable.
• Voltage drop above 1.5V usually requires power injection.
• Voltage drop above 2.0V requires corrective action.

Power Injection Decision Matrix

The following matrix provides a fast engineering assessment of when injection is required: 

rang	Risk Level	Injection Recommendation
Run ≤ 5m	Laag	NIET VEREIST
Run 5–8m	Matig	Check Voltage Drop
Run > 8m	Hoog	Evaluate Injection
Power Density >10W/m	Hoog	Injection Recommended
Voltage Drop >1.5V	bedillerig	Injection Required
Commercial Uniformity Requirement	Hoog	Injection Recommended
Voltage Drop >2.0V	zeer hoog	Immediate Action Required

This matrix allows designers to make decisions quickly without performing detailed calculations during the early planning stage.

For most 24V COB LED strips, injection spacing should never exceed the strip’s recommended single-end run length.

Injection point spacing should not exceed the strip’s recommended single-end run: 9–10m for 7W/m strips, 7–8m for 10–11W/m, 7m for 12W/m, and 5–6m for 24W/m ultra-high-output configurations. 

These values provide a practical starting point for design and quotation.

Final spacing should always be verified using voltage-drop calculations.

Which Power Injection Method Should You Use?

There are three primary injection strategies used in professional installations.

Method 1: Dual-End Feeding

Power is supplied to both ends of the strip.

Voordelen:

• Simple implementation
• Minimal additional wiring
• Excellent for medium-length runs

Typical use case:

8–18m installations.

Method 2: Center Injection

Power is connected at the midpoint.

Voordelen:

• Balanced current distribution
• Verminderde spanningsval
• Shorter effective conductor distance

Typical use case:

Hotel corridors

Retail perimeter lighting

Long coves

Method 3: Multiple Injection Points

The strip is divided into multiple electrically supported sections.

Voordelen:

• Supports very long runs
• Maintains excellent uniformity
• Scalable for large projects

Typical use case:

Architectonische gevel

Shopping malls

Airports

Large hospitality projects

Injection Method Selection Guide

• Under 8m: Single-end feed
• 8–15m: Center injection
• 15–20m: Dual-end feed or center injection
• 20–30m: Multiple injection points
• 30m+: Multiple injection points or 48V system

This framework simplifies decision-making during project planning.

Het juiste selecteren LED strip connectors for power injection is the next practical step once the injection method has been decided — connector type, pin count, and current rating must match the strip specification and wiring layout.

At some point, reducing current through a higher-voltage system becomes more practical than continuously adding injection points.

This is especially true in projects where access for future maintenance is limited.

How to Extend the Run Length of a 24V COB LED Strip

When a project requires more distance than a standard single-end feed can support, there are several proven engineering methods available.

However, not all solutions provide the same level of effectiveness, cost efficiency, or installation simplicity.

Many installers immediately add more power supplies or larger drivers, only to discover that the underlying voltage-drop problem remains unchanged.

The most effective approach is to select the correct strategy based on:

• Run length
• Power density
• Installation access
• Project budget
• Uniformity requirements

Six methods can extend usable run length beyond the single-end limit: 

1. Dual-End Power Feeding
2. Center Power Injection
3. Multiple Injection Points
4. Lower-Power COB Strips
5. Wider PCB or Thicker Copper
6. Upgrading to 48V COB LED Strips

Each method addresses voltage drop differently.

Some reduce current.

Some reduce conductor resistance.

Some shorten the effective electrical path.

Understanding the advantages and limitations of each option is essential for selecting the best solution.

The following table summarizes the performance of each approach.

werkwijze	Run Length Improvement	Complexiteit van installatie	Additional Wiring	het beste voor
Dual-End Feed	Hoog	Laag	Matig	8–18m runs
Center Injection	Hoog	Laag	Matig	Long linear installations
Multiple Injection Points	zeer hoog	Hoog	Hoog	20m+ projects
Lower-Power Strip	Medium	niet een	niet een	Decoratieve verlichting
Wider PCB	Medium	niet een	niet een	New projects
2oz Copper PCB	Hoog	niet een	niet een	Professional installations
48V COB Strip	zeer hoog	Medium	minimaal	Long architectural runs

For most commercial projects, increasing conductor capability or system voltage usually provides a better long-term solution than continuously adding injection points.

Power Supply Sizing for Long COB LED Strip Runs

Selecting the correct power supply is just as important as selecting the LED strip itself.

In fact, many problems that installers attribute to voltage drop are actually caused by undersized power supplies operating near or beyond their rated capacity.

A power supply that appears adequate on paper may become unstable once ambient temperature rises, startup current occurs, or the system operates continuously for extended periods.

For reliable long-term operation, professional LED strip installations should never size the power supply exactly equal to the calculated strip wattage.

The recommended sizing formula is: 

waar:

• P(supply) = Required power supply wattage
• P(load) = Total connected LED strip wattage

The additional 25% capacity provides headroom for:

• Startup inrush current
• Ambient temperature derating
• Component aging
• Voltage regulation tolerance
• Future system expansion

This is one of the simplest and most effective methods for improving long-term system reliability.

For further guidance on choosing the right power supply for LED strip installations — including driver types, wiring configurations, and power supply connection and installation types — refer to our dedicated power supply selection guides.

Power Supply Sizing Calculator Table

The table below provides a quick reference for common installations.

Total LED Load	Minimum Supply (1.25× Rule)	Recommended Standard Size
40W	50W	60W
60W	75W	80W
80W	100W	100W
100W	125W	150W
120W	150W	150W
160W	200W	200W
200W	250W	240W–300W
320W	400W	480W
400W	500W	600W

For commercial projects, selecting the next available standard size is generally recommended.

Common Power Supply Sizing Mistakes

• Matching supply wattage exactly to load causes overheating — always apply the 1.25× rule
• Ignoring ambient temperature leads to thermal shutdown — use derating margin
• Sizing only the first strip segment causes overload — calculate total connected load
• Assuming injection reduces power demand causes incorrect sizing — total wattage stays the same
• Choosing the lowest-cost supply reduces reliability — use industrial-grade drivers for commercial work
• Ignoring startup current causes unexpected shutdown — include reserve capacity

Does Power Injection Change Power Supply Sizing?

Nee.

Power injection changes:

✔ Current distribution

✔ Voltage distribution

✔ Brightness uniformity

But it does not change:

✖ Total power consumption

FAQ

The following questions are the most common concerns raised by installers, lighting designers, procurement teams, and project engineers when planning long-run COB LED strip installations.

Conclusie

For most standard 24V COB LED strips, the recommended single-end run limit is 5 meters. R2R-manufactured strips with optimized PCB design extend this to 10–15 meters depending on power density and copper specification. 

When voltage drop exceeds acceptable limits, power injection, thicker copper, wider PCBs, or 48V systems should be evaluated.

Proper power-supply sizing and wiring design remain the foundation of reliable long-run LED strip installations.