LED lighting has become increasingly popular in recent years due to its energy efficiency, long lifespan, and versatility. Whether you’re planning to install LED lighting in your home, office, or any other space, it is essential to choose the right power supply, including emergency ballast for LED tube lights, to ensure optimal performance and longevity.

Selecting the appropriate power supply involves considering factors such as voltage, current, and wattage. In this article, we will provide you with a comprehensive guide on how to choose the right power supply, including emergency ballast for LED tube lights, for your LED lighting system.

Understanding the Basics: Voltage, Current, and Wattage

Before diving into the selection process, let’s briefly discuss the basics of voltage, current, and wattage as they relate to LED lighting systems.

Voltage: Voltage refers to the electrical potential difference between two points. LED lighting systems typically operate at low voltages, commonly 12V or 24V, making them safer and more energy-efficient compared to traditional incandescent lighting.

Current: Current is the flow of electric charge in a circuit. It is measured in amperes (A) and determines the brightness of an LED. LEDs require a constant current source for optimal performance and to prevent damage.

Wattage: Wattage is the measure of electrical power consumed by a device. In the context of LED lighting, it indicates the total power consumption of the system. It is essential to choose a power supply with adequate wattage to ensure reliable operation.

Selecting the Right Voltage for Your LED Lighting System

Choosing the correct voltage is a crucial step in selecting a power supply for your LED lighting system. LED lighting systems typically operate at either 12V or 24V, although other voltages may also be used. To determine the appropriate voltage for your system, consider the following factors:

  1. LED Strip Voltage: If you’re using LED strips, check the voltage rating specified by the manufacturer. LED strips are commonly available in both 12V and 24V variants, and you must match the voltage of the power supply with the LED strip.

  2. Series or Parallel Configuration: LED lights can be connected in series or parallel configurations. In series connections, the voltage across each LED is added, while in parallel connections, the voltage remains the same. Determine the total voltage requirement based on the configuration of your LED lights.

  3. Cable Length: For longer cable lengths, voltage drop can occur, leading to reduced brightness and performance. To compensate for voltage drop, you may need to select a slightly higher voltage power supply or use voltage amplifiers or repeaters.

Calculating the Current Requirement

Once you have determined the appropriate voltage, the next step is to calculate the current requirement of your LED lighting system including LED emergency driver. LEDs typically operate within a specific current range for optimal performance and lifespan. Follow these steps to calculate the current requirement:

  1. LED Strip Current: Check the current rating specified by the LED strip manufacturer. It is usually expressed in amperes per meter (A/m) or amperes per foot (A/ft).

  2. Total Length of LED Strip: Determine the total length of the LED strip that will be powered by a single power supply. Multiply the length of the strip by the current rating per unit length to obtain the total current requirement.

  3. Number of LEDs: If you’re not using an LED strip but individual LEDs, count the number of LEDs that will be connected to the power supply. Multiply the number of LEDs by their individual current rating to obtain the total current requirement.

Choosing the Appropriate Wattage

Selecting the right wattage is essential to ensure the power supply can handle the load of your LED lighting system. To determine the appropriate wattage, consider the following:

  1. Total Power Consumption: Calculate the total power consumption of your LED lighting system by multiplying the total current requirement (obtained in the previous step) by the voltage of your LED lighting system. The result will give you the total power consumption in watts.

  2. Overhead Power: It’s advisable to choose a power supply with a slightly higher wattage than the calculated total power consumption. This provides a safety margin and ensures that the power supply can handle any fluctuations or additional power requirements that may arise.

  3. Future Expansion: If you plan to expand your LED lighting system in the future, consider the potential power requirements of the additional lights. It’s wise to choose a power supply with some extra wattage capacity to accommodate future expansions without the need for replacing the power supply.

Considerations for Power Supply Types

Once you have determined the voltage, current, and wattage requirements for your LED lighting system, it’s time to consider the type of power supply that best suits your needs. Here are a few key factors to consider:

  1. Constant Voltage vs. Constant Current: LED lighting systems typically require either a constant voltage or a constant current power supply. Constant voltage power supplies deliver a fixed voltage to the LEDs, while constant current power supplies provide a consistent current flow. Match the type of power supply with the specific requirements of your LED lights.

  2. Dimming Capability: If you plan to incorporate dimming functionality into your LED lighting system, ensure that the power supply supports dimming features. Some power supplies have built-in dimming capabilities, while others may require additional dimming components or accessories.

  3. Quality and Reliability: Choose a power supply from a reputable manufacturer to ensure quality and reliability. Look for power supplies that meet industry standards and have certifications such as UL (Underwriters Laboratories) or CE (Conformité Européene).

  4. Efficiency and Energy Savings: Consider the energy efficiency of the power supply. Look for power supplies with high efficiency ratings, such as those with Energy Star certification. Efficient power supplies not only reduce energy consumption but also generate less heat, which can contribute to the longevity of your LED lighting system.

  5. Safety Features: Ensure that the power supply has appropriate safety features such as short circuit protection, overcurrent protection, and over voltage protection. These features safeguard your LED lighting system from potential electrical hazards and equipment damage.


Selecting the right power supply is crucial for the optimal performance and longevity of your emergency LED lights and LED lighting system. Consider the voltage, current, and wattage requirements, and match them with the specifications of the power supply.

Take into account factors like dimming capability, quality, efficiency, and safety features to make an informed decision. By following these guidelines, you can ensure that your LED lighting system operates efficiently, providing the desired lighting experience while minimizing energy consumption and maximizing the lifespan of your LEDs.

Blog page

No Minimum Requirement (MoQs).

Be it small or big order - We cater to all your project's need

Not sure what you required for your lightining project ?
Get in touch with us for FREE consultation.

Get a Free Quote Download Brochure

    Payment Options


    Secure Site