What's the Voltage Drop of LED Strip Light?

author: Ivan Huang

2023-05-09

LED strips are becoming increasingly popular as a lighting solution for homes, offices, and industrial spaces. One important factor to consider when using LED strips is the voltage drop, which can affect the brightness and overall performance of the lights.

In this article, we will explore what voltage drop is and how it affects LED strips.

What is Voltage Drop?

Voltage drop refers to the decrease in voltage that occurs as electrical current travels through a circuit. This phenomenon is caused by the resistance of the circuit, which results in the conversion of electrical energy into heat energy. As the current flows through the circuit, some of the energy is lost due to this conversion, resulting in a decrease in voltage.

Voltage drop is typically measured in volts and can be calculated using Ohm's Law, which states that voltage drop equals the product of the current and resistance of the circuit.

Voltage Drop in LED Strips

LED strips are designed to operate on a specific voltage, which is typically between 12V and 24V DC. When connected to a power source, the LED strip will draw a certain amount of current, which can cause a voltage drop to occur.

The amount of voltage drop in an LED strip will depend on a variety of factors, such as the length of the strip, the size and number of LEDs, the thickness of the wire used, and the distance between the power source and the strip. As a general rule, the longer the LED strip, the greater the voltage drop will be.

To minimize the effects of voltage drop in an LED strip, it is important to use the correct wire gauge and to make sure that the power source is sufficient for the length and type of LED strip being used. It is also significant to minimize the distance between the power source and the LED strip to reduce the amount of voltage drop that occurs.

Calculating Voltage Drop in LED Strips

To calculate the voltage drop in an LED strip, you will need to know the length of the strip, the number of LEDs per meter, the voltage of the power supply, and the wire gauge being used. The following formula can be used to calculate voltage drop:

Vdrop = (length x LED/meter x amps/meter x resistance/meter) / 1000

Where:

Vdrop is the voltage drop in volts

Length is the length of the LED strip in meters

LED/meter is the number of LEDs per meter

Amps/meter is the current draw of the LED strip per meter

Resistance/meter is the resistance of the wire per meter

For example, if you have a 5-meter LED strip with 60 LEDs per meter, a current draw of 1.5 amps per meter, and 18-gauge wire, the voltage drop can be calculated as follows:

Vdrop = (5 x 60 x 1.5 x 0.00639) / 1000 = 0.86V

This means that the voltage at the end of the LED strip will be 0.86V less than the voltage at the beginning of the strip.

Minimizing Voltage Drop in LED Strips

To minimize the effects of voltage drop in LED strips, there are several steps that can be taken:

1. Parallel Connections

If you want to install 30 meters led strip light around the ceiling, you can use the parallel connection to avoid voltage dorp.You can use 2 ways to connect the led strips as follows:

a: 5 meters each connect to the power supply:

b: 10 meters each connect to the power from both sides:

2. Use 24 Volt driver

DC24V led strip enjoy lower voltage drop compare to DC12V type

If you are to install led strip light for a large lighting project, the best way is to use a DC24V led strip light. It will less voltage drop than DC12V led strip lights.

For more, you can check: 12V vs 24V LED strip, which one is better?

3. Use the Correct Wire Gauge

Using a wire that is too thin can increase the resistance of the circuit, resulting in more voltage drop. It is important to use the correct wire gauge based on the length and current draw of the LED strip.

4. Use an LED strip with thick copper PCB

We use copper as the PCB material. This is because it conducts electricity much better. The thickness of copper PCB is usually rated in ounces. The thicker the copper PCB, the more current can flow through. We recommend using 2 ounces, or 3 ounces for higher power LED strips to avoid voltage drop.

The thicker the copper PCB, the less the internal resistance. As such, the copper PCB will carry power more efficiently. In addition, It’s more conducive to heat dissipation.

5. Choose a Suitable LED Power Supply

Using a LED power supply that is too weak can result in voltage drop and reduced brightness. It is important to choose a power supply that is rated for the length and type of LED strip being used.

6. Minimize the Distance Between the Power Supply and the LED Strip

The longer the distance between the power supply and the LED strip, the greater the voltage drop will be. It is essential to minimize the distance between the power supply and the LED strip to reduce the amount of voltage drop that occurs.

7. Use Amplifiers or Repeaters

For longer LED strips, it may be necessary to use amplifiers or repeaters to boost the voltage and compensate for voltage drop. These devices are placed along the circuit to amplify the signal and maintain the proper voltage level.

By taking these steps, you can minimize the effects of voltage drop in LED strips and ensure that your lighting system operates at optimal brightness and performance.

Summary

Voltage drop is a common issue that affects LED strips. But it can be minimized by using Parallel Connections and the correct wire gauge, choosing a suitable power supply, minimizing the distance between the power supply and the LED strip, and using amplifiers or repeaters for longer LED strips. By properly addressing voltage drop, you can ensure that your LED strip lighting system operates at optimal brightness and performance.

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