Driver Technology for COB Downlights: Constant Current vs Constant Voltage

Last Updated on: May 20, 2025

COB downlights need the right driver to perform safely and efficiently. But choosing between constant current and constant voltage can be confusing. Each has its strengths and risks, depending on the application.

Table of Contents

Constant current drivers adjust the voltage to keep the current steady, which helps COB LEDs last longer, shine more evenly, and stay cooler. Constant voltage drivers, on the other hand, provide a fixed voltage. They’re easier to use in parallel setups but can cause uneven brightness or performance. For COB downlights, constant current drivers are typically the more efficient and dependable choice.

Now that we’ve seen the core difference, let’s dive deeper into when, where, and why each driver type works best, especially for lighting pros and electrical engineers working with COBs.

Do I Need Constant Voltage or Constant Current LED Driver?

COB and SMD

The type of LED driver you need depends on how your COB (Chip-on-Board) LEDs are wired and what kind of performance you’re aiming for.

If you’re powering a single COB downlight or a series of LEDs, a constant current driver is the better choice. It regulates the current flowing through the LEDs by adjusting the voltage as needed. This keeps the light output stable and consistent, reduces heat buildup, and helps extend the lifespan of the LEDs. Most professional lighting designers and engineers choose constant current drivers for COB applications because they offer tighter control over performance and safety.

On the other hand, if you’re running multiple LED modules in parallel, a constant voltage driver might be more appropriate. These drivers maintain a fixed output voltage—usually 12V or 24V—while the current varies depending on the load. They’re easier to install and work well in simpler setups, like LED strips or systems where dimming and high precision aren’t critical.

That said, constant voltage drivers can be tricky. You might see uneven brightness if they’re not appropriately matched with the LEDs. Without resistors or something to regulate the current, some LEDs can pull more power than others, leading to lower efficiency and a shorter lifespan.

In short:

  • Use constant current for precision, performance, and COB downlights.
  • Use constant voltage for parallel circuits, LED strips, or plug-and-play setups.

Which is Better, Constant Current or Constant Voltage for COB Downlights?

Regarding COB (Chip-on-Board) downlights, constant current drivers are usually the better choice—and here’s why.

COB LEDs are made up of multiple LED chips packed closely together and mounted on a single board. This design allows for high brightness and efficient light output, but it also means that even small changes in current can affect performance, heat generation, and lifespan. A constant current driver solves this by delivering a steady stream of current while adjusting the voltage as needed. This keeps the light consistent and protects the LED chips from overheating or burning out.

In contrast, constant voltage drivers supply a fixed voltage, typically 12V or 24V. They work well in setups where LEDs are wired in parallel, like strip lighting or modular systems, but they’re not ideal for COB downlights. That’s because COB LEDs usually need precise current control to ensure all the chips on the board light up evenly. Without that, you may see flickering, reduced brightness, or premature failure.

Also, if you’re planning to dim your COB downlights or need them to perform consistently in a professional setting, like retail, hospitality, or architectural lighting, constant current is the way to go. It supports smoother dimming and delivers more stable, predictable results.

Bottom line:

  • Use constant current for most COB downlight applications, especially when quality, safety, and longevity matter.
  • Use constant voltage only if your COB LEDs are specifically designed for it, and even then, proceed with caution.
FeatureConstant Current DriverConstant Voltage Driver
Output TypeFixed current, variable voltageFixed voltage, variable current
Best Use CaseCOB LEDs, high-power LEDs, series circuitsLED strips, parallel circuits, plug-and-play setups
Brightness ConsistencyHigh – maintains uniform output across LEDsMedium – may vary across LEDs without resistors
Thermal ManagementBetter – reduces heat and protects LEDsWeaker – heat can build up if current isn’t regulated
Ease of InstallationRequires careful matching with LED specsEasier to install in basic setups
Dimming CompatibilityExcellent – smoother and more preciseLimited – may require extra components for smooth dimming
Efficiency & LifespanHigher – stable current improves LED lifeLower – uneven current can reduce lifespan
CostSlightly higher upfrontGenerally cheaper
Ideal for COB Downlights?Yes – Recommended⚠️ Only if specifically designed for it

What is the Difference between Constant Current Mode and Constant Voltage Mode?

The key difference between constant current and constant voltage modes comes down to what the power supply is trying to control—current or voltage.

In constant current mode, the driver’s main job is to deliver a steady current flow to the LED, no matter what. As the electrical resistance of the LED changes—maybe due to temperature fluctuations or aging—the driver automatically adjusts the voltage to make sure the current stays the same. This is ideal for COB downlights and high-power LEDs, where even small variations in current can cause overheating, brightness shifts, or shorten the fixture’s lifespan.

On the flip side, constant voltage mode locks the output voltage at a fixed level—usually 12V or 24V. The current is allowed to fluctuate depending on how much power the connected LEDs draw. This approach is great for simpler lighting setups, like LED strips or decorative lights, where precise current control isn’t critical. However, this mode can cause trouble with COB LEDs. If one part of the circuit draws more current than another, it could lead to inconsistent brightness or even early failure of some LEDs.

Think of it like this:

  • Constant current mode is like a smart cruise control system—it adjusts the gas to keep your speed steady, no matter if you’re going uphill or downhill.
  • Constant voltage mode is like keeping your foot at the same spot on the gas pedal—the speed will vary depending on the road.

Both modes have their place. But for COB downlights, where stability and performance matter, constant current mode almost always wins.

Constant Current Mode vs Constant Voltage Mode: What’s the Real Difference?

FeatureConstant Current ModeConstant Voltage Mode
What It ControlsKeeps current (amperage) steadyKeeps voltage steady
Voltage BehaviorVoltage changes depending on loadVoltage stays fixed (e.g. 12V or 24V)
Current BehaviorCurrent stays fixed (e.g. 350mA, 700mA)Current varies depending on the connected load
Ideal ForCOB downlights, high-power LEDs, series circuitsLED strips, parallel circuits, decorative lighting
Performance ConsistencyVery stable – reduces flicker and brightness variationLess consistent – can cause uneven lighting without regulation
Risk of OverheatingLower – current is controlledHigher – if load pulls more current than expected
Wiring TypeLEDs wired in seriesLEDs wired in parallel
Best For Precision Lighting?✅ Yes⚠️ Not ideal without extra regulation
Common Output Values350mA, 500mA, 700mA, 1050mA12V DC, 24V DC
Common ApplicationsSpotlights, downlights, commercial & architectural lightingLED strips, signage, under-cabinet lighting

How does Input and Output Voltage Affect COB LED Performance?

Voltage might seem like just a number on a label, but when it comes to COB LED performance, it plays a critical role.

Let’s start with input voltage—the voltage your power source delivers to the LED driver. Most LED drivers are designed to accept a range, like 100–240V AC, which makes them compatible with both residential and commercial power supplies. If the input voltage falls outside this range, the driver can fail or shut down, so your lights won’t even turn on. So, matching your driver’s input range with your power source is important, especially if you’re installing lights in regions with different voltage standards.

Now on to output voltage—this is where things directly affect the LED’s performance. In a constant current setup, the driver will vary its output voltage to maintain a fixed current. If the output voltage doesn’t match the requirements of the COB LED (which depends on how many LED chips are on the board and how they’re wired), the light might flicker, underperform, or fail altogether.

For constant voltage systems, the output voltage stays fixed—usually 12V or 24V. If your COB LED is rated for 24V and you connect it to a 12V driver, it won’t light up properly. And if you go the other way—connecting a 12V-rated LED to a 24V driver—you risk overheating, burning out the chips, or even causing a fire hazard.

There’s also the voltage drop issue, especially in longer cable runs. If the voltage delivered to the LED is lower than expected by the time it arrives, you’ll see dimmer light output. This is why choosing the right wire gauge and driver location also matters.

In short, correct voltage = correct performance. Whether it’s input to the driver or output to the LED, keeping voltage within spec ensures your COB downlights run efficiently, stay bright, and last as long as they’re supposed to.

Are Constant Current LED Drivers More Energy-Efficient?

Yes, in most cases, constant current LED drivers are more energy-efficient than their constant voltage counterparts, especially when used with COB downlights.

The main reason comes down to how the power is controlled. A constant current driver delivers a fixed amount of current to the LED, regardless of changes in voltage. This means the LED receives exactly the amount of power it needs—no more, no less. That level of precision minimizes wasted energy, reduces heat generation, and extends the overall life of the LED fixture.

In contrast, a constant voltage driver maintains a steady voltage output, but the current varies depending on the LED load. If the connected LEDs don’t have built-in current regulation (like resistors or control chips), they can draw more current than needed. This leads to overdriving, where excess current turns into heat, not light, which wastes energy and can shorten the life of the LEDs.

Another key point: COB LEDs are designed for uniform brightness and consistent performance. That consistency is easier to maintain with a constant current driver. With less power fluctuation, your LEDs operate more smoothly and require less power overall to achieve the same brightness, compared to a system using constant voltage, where some of that energy might be lost as heat or imbalance across multiple LEDs.

And let’s not forget dimming. Many constant current drivers offer more efficient dimming capabilities, especially in commercial lighting setups. Smooth dimming at lower power levels means more energy savings, especially in spaces where lighting needs to adjust throughout the day.

In short, while both driver types have their uses, constant current drivers are the better option for energy-conscious setups, particularly when high-performance and long-term efficiency matter.

When Should I use 12V vs 24V Constant Voltage LED Drivers?

Great! Here’s a natural, clear expansion of the following section:

If you’re using a constant voltage LED setup, one of the first decisions you’ll need to make is whether to go with a 12V or 24V driver. While both do the same basic job—delivering a fixed voltage to your LEDs—choosing between them can impact performance, wiring, and installation costs.

12V Drivers: Best for Short Runs and Small Fixtures

A 12V driver is often used in smaller installations, like under-cabinet lighting, accent lighting, or compact display cases. It works well when the total distance between the driver and the LED fixture is short. That’s because lower voltage systems are more prone to voltage drop—the loss of power over long cable runs. If the run is too long, your LEDs at the far end may appear dimmer than those closer to the power source.

12V drivers are also a common choice for plug-and-play LED strips and simple DIY setups because the components are more widely available and usually easier to install.

24V Drivers: Better for Longer Runs and Higher Loads

If you’re working on a larger project—especially one with longer wiring distances or higher-wattage fixtures—a 24V driver is typically the better choice. Because the voltage is higher, the current required to deliver the same power is lower, which helps minimize voltage drop and heat buildup in the wires. That means more consistent brightness across all your LEDs, even in a large space.

24V systems are often used in commercial lighting, signage, and larger-scale residential projects. They’re more efficient over long distances and usually require less copper wiring, which can help reduce material costs.

Choosing the Right One

Here’s a simple way to decide:

  • Go with 12V if you have a short run, lower power requirement, or are using a pre-configured LED strip that specifically needs 12V.
  • Choose 24V for longer cable runs, higher wattage fixtures, or installations where efficiency and consistent output matter more.

Just remember: Always match your LED driver’s voltage to the LED’s voltage rating. Running a 12V LED on a 24V driver can damage the LEDs almost instantly.

12V vs 24V Constant Voltage LED Drivers: Quick Comparison

Feature12V Driver24V Driver
Best ForShort cable runs, small setups, simple LED stripsLonger runs, high-power LEDs, commercial or large-scale use
Voltage Drop RiskHigher (more drop over distance)Lower (better over longer distances)
Power EfficiencyLess efficient in large setupsMore efficient for high-wattage or long wiring installations
Current RequiredHigher current to deliver the same wattageLower current = less heat, less wire loss
Common ApplicationsCabinet lighting, accent lights, DIY stripsCommercial signage, large rooms, outdoor runs
Wiring CostMay need thicker cables for long runsCan use thinner cables—cost savings over distance
Driver & LED AvailabilityWidely available, easy to findSlightly less common for plug-and-play, more in pro-grade gear
Risk of Overload (Mismatch)High risk if paired with 24V LEDsHigh risk if paired with 12V LEDs

What is A Constant Current Driver Circuit and How does it Work?

A constant current driver circuit is a type of electronic circuit specifically designed to supply a steady flow of current to an LED, regardless of changes in voltage or resistance. This is especially important for COB (Chip-on-Board) LEDs, where consistent performance and protection from overcurrent are key to long-term reliability.

Why Current Control Matters

Unlike traditional light bulbs, LEDs are current-driven devices. That means the amount of current flowing through the LED, not just the voltage, determines how bright it gets. If too much current flows, the LED can overheat and fail. If the current is too low, it may flicker or appear dim. This is where constant current drivers shine.

How the Circuit Works

In a constant current circuit, the driver adjusts its output voltage automatically to ensure that the desired current (measured in milliamps, like 350mA or 700mA) stays consistent. It continuously monitors the load (in this case, the LED or array of LEDs) and fine-tunes the voltage to keep the current steady, even if the temperature, resistance, or LED aging changes over time.

For example, a typical constant current driver might be labeled:

Output: 700mA, 20–42V

This means the driver will always supply 700mA of current, while the output voltage can vary between 20V and 42V depending on how many LEDs are in the circuit and how they behave during operation.

Main Components Inside the Circuit

  • Current sense resistor: Measures the actual current flowing and provides feedback.
  • Control IC or transistor: Adjusts the output voltage based on current feedback.
  • Switching regulator or linear regulator: Maintains the efficiency of the power conversion process.
  • Protection features: Often includes thermal shutdown, short circuit protection, and over-voltage protection.

Why It’s Ideal for COB LEDs

COB LEDs typically consist of multiple LED chips working as a single module. Because they share the same current, using a constant current driver helps prevent uneven brightness and overheating of individual chips. It also simplifies wiring, especially when LEDs are wired in series, and improves energy efficiency.

A constant current driver circuit ensures that your LEDs receive just the right amount of power, not too much and not too little, regardless of what’s happening elsewhere in the system. That’s a huge win for performance, safety, and lifespan, especially in professional lighting applications.

Can You Replace a Constant Current LED Driver with A Constant Voltage One?

In short: No, you shouldn’t—unless the LED fixture specifically says it’s compatible with both. Swapping a constant current driver for a constant voltage one can damage your COB LED and possibly create a safety hazard.

Why It Doesn’t Work

COB LEDs are typically designed to run on constant current. That means they rely on the driver to regulate how much current they receive. If you replace that driver with a constant voltage one, you’re suddenly sending a fixed voltage to a load that was expecting regulated current.

Without proper current control:

  • The COB module might draw more current than it should, since LEDs naturally pull more current as they heat up.
  • This can lead to overheating, flickering, or even permanent damage to the LED chips.
  • In the worst case, it could cause fire risk, especially in enclosed or poorly ventilated fixtures.

What About the Reverse?

Switching from a constant voltage driver to a constant current driver is also risky—unless the LED load is designed for it. Constant voltage LEDs often rely on internal resistors or current-limiting chips. Applying a constant current driver to those could confuse the circuit and lead to irregular performance or failure.

How to Check Before Replacing

Always start by checking the spec label on your LED fixture:

  • If it lists output current (e.g., “350mA, 700mA”), it’s a constant current LED.
  • If it lists voltage only (e.g., “12V DC” or “24V DC”), it’s designed for constant voltage.

If you’re unsure, refer to the manufacturer’s datasheet or contact their support team. Using the wrong type of driver is one of the most common causes of LED failure—something that’s easily avoidable with a little due diligence.

Are There Waterproof Constant Current LED Drivers Available?

Waterproof IP Rating

Yes, waterproof constant current LED drivers are widely available—and they’re a must-have if you’re installing COB downlights in any environment exposed to moisture, dust, or outdoor conditions.

Why Waterproofing Matters

Standard LED drivers are typically housed in plastic or metal casings that offer minimal protection against water or humidity. But in settings like bathrooms, outdoor soffits, landscape lighting, kitchens, or industrial spaces, moisture can easily seep into unprotected drivers, leading to short circuits, corrosion, or total failure.

A waterproof driver, often rated with an IP65, IP66, or even IP67 rating, is sealed to prevent water and dust from entering. This not only protects the internal electronics but also helps maintain performance and extend the life of your entire lighting system.

Constant Current + Waterproof: A Common Combo

Many professional-grade constant current drivers come with waterproof ratings. These drivers are commonly used in outdoor LED floodlights, architectural lighting, signage, and high-end residential projects where COB downlights are used in damp or wet areas.

Typical features of waterproof constant current drivers include:

  • IP65 or higher protection: Prevents ingress of water jets, rain, or condensation.
  • Aluminum casing: Helps with both waterproofing and heat dissipation.
  • Potted internal components: Encased in silicone or epoxy for added moisture protection.
  • Wide temperature tolerance: Built to operate reliably in extreme heat or cold.

How to Choose the Right One

When selecting a waterproof constant current driver, make sure to:

  • Match the output current to your COB LED’s requirements (e.g., 350mA, 700mA, 1050mA).
  • Check the output voltage range to ensure it suits your LED configuration.
  • Look for certifications like UL, CE, or FCC for safety assurance.
  • Confirm the IP rating based on how much water exposure is expected. For example:
    • IP65: Splash-proof and rain-safe—great for outdoor soffits or damp rooms.
    • IP67: Submersible up to 1 meter—ideal for areas with heavy water exposure.

What Warranty and Safety Standards Should A COB LED Driver Meet?

When you’re investing in COB downlights—especially for commercial or long-term residential projects—the quality of the LED driver is just as important as the light itself. One of the best ways to ensure reliability is by checking the warranty and safety certifications attached to the driver.

Warranty: What to Look For

A good-quality constant current driver should come with at least a 3 to 5-year warranty. Some high-end manufacturers offer up to 7 or even 10 years, especially for industrial or architectural-grade products.

What a solid warranty tells you:

  • The manufacturer trusts the durability of their product.
  • The components used are likely higher quality—better capacitors, surge protection, and thermal management.
  • You have peace of mind if something goes wrong due to a manufacturing defect.

Be sure to check the fine print. Some warranties are limited by usage hours, temperature conditions, or installation method. For example, installing a driver in an unventilated space or exceeding rated loads may void the warranty.

Safety Standards and Certifications

High-quality COB LED drivers should carry recognized safety and compliance certifications. These show the product has been independently tested for things like electrical safety, electromagnetic interference, and environmental standards.

Here are the most important certifications to look for:

CertificationMeaning
UL (Underwriters Laboratories)North American standard for electrical safety. Common in the U.S. and Canada.
CE (Conformité Européenne)Indicates conformity with EU health, safety, and environmental protection standards.
FCCEnsures the product doesn’t emit harmful electromagnetic interference (U.S. requirement).
RoHSConfirms the product is free from hazardous substances like lead and mercury.
TÜV / ENECEuropean safety certifications, often used for high-end commercial lighting.
IP Rating (e.g., IP65, IP67)Indicates level of protection against dust and water (especially important outdoors).

Also, look for surge protection, short-circuit protection, thermal shutdown, and open-circuit protection—these aren’t certifications, but key internal safety features you should expect in a reliable driver.

Constant Current vs Constant Voltage in High-Heat or Outdoor Applications

When installing lighting in outdoor environments or high-heat areas, like attics, factories, kitchens, or exterior soffits, the type of driver you use becomes even more critical. These harsh conditions can quickly expose weaknesses in your lighting system, especially in the driver.

How Each Driver Type Handles Harsh Environments

Constant Current Drivers are generally better suited for high-heat and outdoor applications, particularly when paired with COB downlights. Here’s why:

  • They regulate current flow precisely, which reduces unnecessary heat buildup in the LED chips.
  • Many constant current models are designed with thermal protection, shutting down or dimming when temperatures exceed safe levels.
  • They’re often built using higher-grade components, with better heat sinks and more robust casings, especially waterproof models with IP65 or IP67 ratings.

On the other hand, Constant Voltage Drivers can be more vulnerable in these settings. Because they maintain a fixed voltage, the LEDs draw as much current as they need. In hot environments, LED resistance drops, causing them to draw even more current, which further increases heat—this can lead to thermal runaway, a situation where rising temperature and current feed off each other until the LED fails.

Heat = Shorter Lifespan

Both types of drivers will suffer if they’re not rated for the environment they’re installed in. Heat can dry out capacitors, damage internal circuitry, and shorten driver life dramatically. But constant current drivers tend to handle this better, thanks to built-in protections and more efficient power regulation.

What to Look for in Outdoor/High-Temp Installations

  • Wide temperature operating range (e.g., -40°C to +70°C)
  • IP65 or higher for waterproofing
  • Thermal overload protection
  • Surge protection (especially in outdoor setups)
  • Aluminum or metal casing for better heat dissipation

Constant Current vs Constant Voltage Drivers in Harsh Conditions

Feature/ConditionConstant Current DriverConstant Voltage Driver
Heat Resistance✅ Better at managing heat buildup⚠️ Prone to thermal runaway if current isn’t limited
Current Regulation✅ Maintains safe, steady current regardless of heat❌ Current increases as temperature rises
Thermal Protection✅ Often includes thermal shutdown or dimming features⚠️ May lack built-in thermal protection
Outdoor Suitability✅ Commonly available in waterproof (IP65/IP67) models⚠️ Some models available, but not always ideal for outdoor use
Component Quality✅ Higher-grade capacitors, better heat sinks⚠️ Lower-end models may degrade faster in heat
LED Lifespan Support✅ Extends COB LED life in extreme environments❌ Can shorten LED life if overdriven or unprotected
Best Use CaseOutdoor lighting, attics, kitchens, high-bay fixturesIndoor LED strips, short runs, low-heat areas

Is Constant Current Better for Dimmable COB Downlights?

Yes—constant current drivers are generally the better choice for dimmable COB downlights. If smooth, stable dimming is important in your setup—whether it’s for mood lighting, energy saving, or light control—constant current offers more precision and reliability.

Why Constant Current Works Better for Dimming

COB LEDs are sensitive to current fluctuations. A constant current driver regulates the current to the LED very precisely, which helps the dimming process stay smooth and predictable, especially at lower light levels. Whether you’re using 0-10V dimming, TRIAC (phase-cut) dimming, or PWM (pulse-width modulation), most dimmable COB systems are designed with constant current control in mind.

With a quality constant current dimmable driver, you’ll notice:

  • No flickering, even at low brightness settings
  • Consistent color temperature, which some LEDs struggle to maintain when dimmed
  • Longer LED lifespan, because the current stays within safe limits

The Problem with Dimming Constant Voltage Drivers

While constant voltage drivers can be dimmable, they often require external PWM dimmers or specialized controls. Even then, performance may be inconsistent. Common complaints are flickering, stepping (where the dimming changes in visible “jumps” instead of smoothly), and poor compatibility with dimmer switches. This is especially true when multiple COB modules are wired in parallel.

Dimming and Safety

Another reason constant current is preferred is protection during dimming. Since the current is already controlled, dimming the light doesn’t put your LEDs at risk of overcurrent or thermal issues—two common problems in dimmed constant voltage systems.

What does A “Constant Current LED Driver 50W” Really Mean?

When you see a label that says “Constant Current LED Driver 50W,” it’s describing three key things: the type, the power capacity, and how the output is controlled. But to really understand what that means for your COB downlights, let’s break it down.

1. Constant Current

This tells you that the driver is designed to supply a fixed current, measured in milliamps (mA). The voltage will automatically adjust to meet the needs of the LED load, as long as it stays within the driver’s rated voltage range. This is ideal for COB LEDs, which perform best with a steady current supply.

For example, you might see:

  • Output: 700mA, Voltage range: 20–72V

That means the driver will supply 700 milliamps constantly, and will adjust its voltage anywhere between 20 and 72 volts, depending on how many LEDs are connected and how they behave during operation.

2. 50W (Wattage Rating)

This is the maximum power output the driver can deliver—50 watts. It measures how much energy the driver can push to your LED load. You can use this to calculate the maximum load it can safely handle.

The basic formula is:

📐 Watts = Current × Voltage

So, if your driver is rated at 700mA (or 0.7A) and outputs 50W, then:

Max Voltage = 50W / 0.7A = approx. 71V

That means this driver can support COB LEDs wired in series, as long as their total voltage falls below 71V.

3. Why It Matters for Your Setup

Knowing this information helps you:

  • Match the driver correctly to your COB LED module’s current and voltage requirements.
  • Avoid overloading the driver, which can cause overheating or early failure.
  • Ensure efficient operation, especially when wiring multiple LEDs in series.

Also, remember that if your COB downlight only needs 35W, using a 50W driver is fine, as long as the current rating matches. The driver will only supply the power the LEDs draw, up to their maximum.

Summary

Choosing the right driver technology ensures COB downlights perform at their best. Constant current is the go-to for stability, lifespan, and brightness, while constant voltage offers simplicity. Still unsure? Contact Us—we’re here to help you power up the right way!

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I’m from Upward Lighting. We are a professional Outdoor led lighting manufacture in China since 2009. We provide high quality led lighting products for indoor and outdoor projects.

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