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How to Choose Led Driver and Led Power Supply?

Sep. 10, 2020


If you want to build LED lamps, maintain existing lamps or purchase LED lamps, you may need a constant current LED driver or a constant voltage power supply to operate the LED normally. When choosing a drive or power supply, many factors should be considered. Constant current led driver supplier will help you choose the power supply that suits your needs.

Constant current driver

LEDs usually have power limiting devices (drivers or resistors) to prevent the LEDs from being overdriven. A constant current drive is used to adjust the amount of current supplied to the LED or LED array to maximize the life of the LED. If the current is not adjusted, the brightness of the LED may fluctuate and its life will be shortened. Constant current drivers are used for LEDs or lamps that require stable output current and work within a certain voltage range. Most finished LED products already have constant current drivers or resistors to regulate current. If you want to manufacture LED lamps or replace constant current drivers, it is important to verify that the output current and voltage of the driver are compatible with the current and voltage of the LED. If your LED product already has a constant current driver or uses a resistor in the LED array, you may need a constant voltage power supply.

Constant Voltage Power Driver

Constant Voltage Power Driver

Constant voltage power supply

Constant voltage power supply can be used to power LED products with resistors or constant current drivers. If products with these current regulating devices require a different operating voltage than the voltage provided by the power source (home, vehicle, etc.), they may require a constant voltage power source. For example, LED strips are equipped with current regulating resistors. If the light strip works in the 9-14.8 volt direct current (DC) range, it can be installed in a vehicle with a 12 volt DC system without the use of a constant voltage power driver. In order to install the light strip in a house with a 120-volt alternating current (AC) wiring system, it is necessary to reduce the voltage and convert it from AC to DC through a power supply.


When choosing a constant voltage power supply, you must determine how many watts your light consumes. If your project requires multiple light sources, you need to determine the total wattage used. Make sure there is enough power to handle the wattage of all combination lamps. You need to choose a power supply with a rated power that is at least 20% higher than the total power of the lighting system to ensure that you do not overuse the power supply. A simple calculation method is to multiply the total wattage of the lighting by 1.2. For example, if you have five LED path lights, each consuming 4 watts, your total lighting power is 20. Simply multiply 20 watts by 1.2 (20 x 1.2 = 24) to determine the power required. A 24 watt (or higher) power supply can solve the problem!

Voltage and current

If you want to manufacture LED lamps or replace constant current drivers, it is important to verify that the output current and voltage of the driver are compatible with the current and voltage of the LED. If your LED product requires a constant voltage power supply or a constant current driver, please check the product specifications to understand its working requirements and ensure that it is compatible with the power supply or driver specifications. In addition, please make sure that the input voltage of the power supply or driver matches the installation location. If you want to use 12V DC working LED products in a 120V AC home wiring system, you will need a power supply whose input range includes 120V and DC output is 12V.

When choosing a constant current led driver led driver for your LED project, make sure to meet the LED current and voltage requirements. If the LEDs are in a parallel configuration, increase all current values while keeping the voltage range stable. If LEDs are used in series, add all voltage values, but keep the current the same as a single LED.

The dimming ability

If your LED is dimmable and you want to change its brightness, select a dimmable drive or power source.The specifications of these power supplies usually list whether they are dimmable or not.

Temperature and weather resistance

Another factor to consider when choosing a power supply is the environment in which it will be used.Power supplies and drivers are most efficient if they are used in an environment where the temperature is within their operating temperature range.Each power or drive also has a protection class (IP).IP grade represents the solid size and liquid pressure that the power housing can withstand.The first number refers to the size of solids - ranging from the size of the hand to the size of the dust.The second number refers to the pressure from rain to full immersion.As each number increases, so does the level of protection.Your power equipment should have IP protection rating to indicate environmental protection.

The efficiency of

The efficiency of the power supply or drive represents the percentage of power that makes your LED product work.It is recommended that LED's work efficiency be 80% or higher.


When selecting a driver or power supply, the size or area of the LED product housing is important.If a constant current LED driver is to be placed inside the product, the driver must be small enough to fit into the product's housing.Similarly, if the driver or power supply is used outside the product housing, the installation area should be suitable.Drives and power supplies are available in a variety of sizes to meet your needs.