What power supply do I need for LED lights?

LED, or light-emitting diode, is a new and emerging technology expected to replace all the traditional light bulbs in our lives within the next few years. But what is LED, and how do you calculate the power of LED light? This article will help you answer this question.

LED is an energy-efficient light-emitting diode. When the semiconductor device absorbs energy, electrons flow and create a flow of energy (electricity) in that semiconductor. This electric current flows through a filament, which may be made of silicon, to generate light. The electrical current generated can be either positive or negative. Depending on the kind of filament that is used, either polarity of current can be used.

What is the function of an LED Power supply?

There are two types of power supply, constant current and constant voltage.

Difference LED Driver and LED Power Supply

LEDs are widely used everywhere. The media suggest that the world of LEDs is simple.

Depending on the product, there are “LED drivers” or “LED power supplies,” The wiring can be parallel or in series.

What are the differences between the LED driver and LED power supply?

An LED is a light-emitting diode, a light-emitting semiconductor part. 

Properties of a diode:

-a diode only allows current to flow in one direction. If the current flows in the right direction through the LED, it emits light.

– a diode needs a constant voltage

– LEDs cannot limit the current flowing through them. The warmer a LED gets, the more conductive it becomes.

With these basics, I will now explain the difference between an LED driver and an LED power supply/transformer:

LED driver: usually use for LED downlight

The specifications of the LED driver are always the current output: e.g., 350mA or 700mA. This means that the LED driver is a constant current source. The driver limits the current that should flow through an LED because the LED itself cannot do that. LEDs are usually connected to a driver in series. With LEDs, the operating instructions should always be read carefully.

LED power supply: usually use for LED strips

The voltage of the LED power supply is always specified, e.g., 12V or 24V. A LED power supply is like an electronic transformer, except that it usually outputs power at 1VA. A standard electronic transformer usually gives off its power only from about 40VA, depending on the size of the transformer. With LED power supplies, the LED lamp or bulb usually has a current limiter built-in.

The difference between a LED driver and a LED power supply is the circuit. With LED drivers, the current, and with LED power supplies, the voltage is predefined.

With LED drivers, the current is predefined.


With LED power supplies, the voltage is predefined.


Many LED strips are operated with LED power supplies. Here you have to pay attention to the operating voltage: 12V or 24V.

Power Wattage for LED Driver

LED Driver, the power of the light should be 20% lower than the LED driver

LED Driver put inside the downlight

Power Wattage of LED strips

Density of LEDs per foot, more LEDs per foot need

LED power supply, the power of the light is also better under 80% usage.

LED strip different LEDs and size the power is different

How do we calculate the current use?

How do we calculate the current use? The calculation of current consumed by LED light bulbs depends on the characteristics of the diode and its physical structure. For instance, the diodes with the polarity of positive current will create light when electrons flow; the diodes with the polarity of negative current will absorb a lot of electron energy, thus not producing any light. There are other factors. However, that influences the current produced. Understanding them will let us choose the correct power supply for us LED light bulbs.

First, must choose the LED to match the physical structure of the LED light source and the current that it needs to produce. LED bulbs designed to make the most light per watt of current are called ‘high power’ diode light sources. On the other hand, lower wattage diode will be using a diode with a polarity of -1. These types of LED are also used in calculators, which use the current generated by the electron to store data.

Understanding how the current is made available to the diode also helps us decide on the type of diode we need. The LEDs are the standard choice for small currents; the silicon-based phosphor diode works quite effectively for larger currents. Finally, the N-type diode can generate currents even more significant than the others.

Type of LEDs

Now that we have decided on LEDs, we should look at how the current is supplied to the LEDs. The current that the LEDs need comes from an electric motor. If the engine does not have enough power to operate the LED, the lamps will dim out. To avoid this problem, opt for a high-power motor that can handle the current requirement of the diode.

The next thing that we will need to look at is the power supply for the LEDs. The main characteristic of a diode is that it can only generate current when a positive and negative voltage is applied. This voltage is determined by the inherent characteristics of the diode, namely the polarity of the electron, its total voltage, and the current capacity. To ensure that the diode current is correctly controlled, it is recommended that the diode is connected to its power source.

What power supply for the LEDs you will be connecting to your lights is entirely a personal decision. There are many power supplies on the market that can handle the current that the diode will be applying. However, for best results, you should use a diode that is capable of regulating its current. A diode that can be handled effectively will allow the diode current to be varied according to the ambient room temperature.

How to install a LED strip

  • Keep the sticking surface dry-clean and smooth
  • Paste and press the tape
  • Bracket fixing clips and fixed on the head, tail and bends of the LED strips
  • Connect the LED Power supply

How to install a LED Downlight

How to install a LED Bar light

Easy Installation

–1. Install the spring on the ceiling

–2. Fix the spring with the screw

–3. Put the light body into spring


Ena Leung

Ena Leung

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