12V DC LED transformer

Choosing the right LED transformer is crucial for the optimal performance and longevity of your LED lighting system. Selecting an appropriate transformer ensures that the LEDs receive the correct voltage and current, thereby minimizing the risk of damage and ensuring energy efficiency. In this guide, you will find our tips and tricks for choosing your LED transformer, taking into account factors such as the required power in watts, voltage and current requirements, and safety considerations.

What is an LED transformer and what is it used for?

Low-voltage LED transformers are devices that convert the high voltage from the main power supply into low voltage suitable for powering LEDs. These transformers effectively provide the precise voltage required for optimal LED performance, typically between 12 and 24 volts.

Using the right transformer helps avoid issues related to voltage fluctuations and ensures a reliable power source for your lighting needs.

Factors to consider when choosing an LED transformer

Several factors must be considered when choosing a transformer for LEDs to ensure compatibility and device efficiency:

Voltage and current requirements:

To choose a suitable LED transformer, it is essential to understand the voltage and current requirements, as incompatibility can lead to malfunction, reduced LED lifespan, or even irreversible damage. Here are the key points to consider:

Output voltage (V - Volts):

Constant voltage: Most LED transformers provide a constant output voltage, usually 12V or 24V DC. This voltage must exactly match the nominal voltage of the LED strips or spots you are using. For example, if your LEDs operate at 12V, the transformer must also deliver 12V.

SELV compatibility: LED transformers are often designed for a SELV (Safety Extra Low Voltage) output, meaning a voltage below 50V, making them safe for domestic or commercial use.

Output current (A - Amperes)

Current capacity: The transformer's output current must be sufficient to power all connected LEDs. For example, a 5A transformer can provide up to 5 amperes of current. If your LEDs consume a total of 1A, a 5A transformer is more than sufficient.

Total current calculation: To determine the total required current, divide the total LED power (in watts) by the transformer's output voltage. For example, if you have LEDs consuming 60W at 12V, the required current will be 60W / 12V = 5A

Maximum power (W - Watts)

Power capacity: The transformer's maximum power must be equal to or greater than the total power of the LEDs. For example, if your LEDs consume 40W, choose a transformer of at least 40W.

Safety margin: To avoid saturating the transformer and ensure a long lifespan, it is recommended not to exceed 80% of its maximum capacity. Thus, for a total power of 40W, opt for a transformer of 50W or more.

Current type (AC/DC)

DC output: LEDs operate on direct current (DC), so the transformer must convert the alternating current (AC) from the grid (220V-240V) into direct current (12V or 24V DC).

Current quality: Ensure that the transformer provides a stable current without fluctuations, as variations can damage the LEDs or cause flickering.

Compatibility with LED load

Minimum load: Some transformers require a minimum load to function correctly. Check that the total LED power exceeds this minimum load.

Maximum load: Never exceed the maximum load indicated on the transformer, as this could lead to overheating or failure.

Dimming (if applicable)

If you are using a dimmable transformer, ensure it is compatible with the type of dimming you plan to use (TRIAC, 0-10V, PWM, DALI, etc.). Incompatibility can lead to malfunction or damage.

Example calculation:

Suppose you have a 5-meter LED strip consuming 14.4W/meter at 12V:

Total power: 5×14.4W=72W

Required current: 72W / 12V = 6A

Recommended transformer: At least 90W (to respect the 80% margin) and 6A, with a 12V DC output.

Power capacity:

Total power required: Calculate the total power of your LED lamps and ensure the transformer can support this load.

To calculate the required wattage for an LED transformer, you must consider the total consumption of the LED strips or spots you want to power. Here are the steps to follow:

Identify the power (in watts) of each LED strip or spot: This information is generally indicated on the product or in its technical documentation. For example, an LED strip may consume 10W per meter.

Calculate total power: Multiply the power of one LED element by the number of elements you want to connect. For example, if you have 5 LED spots of 4W each, the total power will be 5 × 4W = 20 W

Add a safety margin: To avoid saturating the transformer and ensure a long lifespan, it is recommended not to exceed 80% of the transformer's maximum capacity. Thus, if your total power is 20W, choose a transformer with a power of at least 25W.

Select a suitable transformer: Choose a transformer whose maximum power is equal to or greater than the calculated value. For example, for a total power of 20W, a transformer of 25W to 30W will be perfectly suitable.

Our online store specifies the wattage of each LED transformer. This information is visible in the technical sheet of each transformer, as shown in the screenshot below.

Example of a technical sheet for an LED transformer

Compatibility with dimming drivers:

Note that a dimming driver for an LED transformer is an electronic device that allows you to regulate the luminous intensity of the connected LEDs. If you wish to use such a device, ensure that the transformer is compatible with the type of dimming you plan to use (0-10V, DALI, or Triac). Incompatibility can result in issues such as flickering, malfunction, or reduced LED lifespan.

Safety of LED transformers:

LED transformers are equipped with several protection mechanisms to ensure their reliability, safety, and durability. These protections are essential to prevent damage caused by abnormal electrical conditions or harsh environments. A SELV-type LED transformer (SELV - Safety Extra Low Voltage) provides an output voltage below 50V, which is considered safe for users. This reduces the risk of electric shock and allows use in sensitive environments.

Applications of LED transformers

LED transformers are used in various contexts, enhancing the versatility and efficiency of lighting:

Residential spaces: They are ideal for homes, apartments, and condominiums, providing energy-efficient lighting solutions for various areas such as living rooms and outdoor spaces.

Commercial buildings: Offices, retail stores, and hospitality businesses use LED transformers for reliable and cost-effective lighting.

Architectural and decorative lighting: LED transformers are widely used in projects aiming to highlight features or artworks, creating captivating displays in public spaces.

Some high-end LED transformers in our store

SELV LED Transformer 15 Watts 220V 12V/DC

Discover the SELV LED transformer 12V/DC 1.25A Max from the brand Arum Lighting. This 15W device is designed to power your LED lighting installations with precision and safety. Compact and robust, it measures only 102 mm in length, 35 mm in width, and 17 mm in height, making it an ideal choice for confined spaces. With an input of 220V AC and an output of 12V DC in constant voltage, it ensures a stable power supply for your LED applications, while offering protection against surges.

SELV LED Transformer 15 Watts 220V 12V/DC

Equipped with protection class II and an IP20 protection rating, this transformer is designed for indoor use, ensuring optimal electrical safety. Its durable plastic casing and screw terminal block facilitate easy and secure installation. The SELV (Safety Extra Low Voltage) output ensures safe use, even in sensitive environments.

To extend the lifespan of your LED transformer, it is recommended not to exceed 80% of its maximum capacity. This standalone device is perfectly suited for residential or commercial LED lighting projects, offering reliability and performance over the long term.

SELV LED Transformer 60 Watts 220V 12V/DC

Our store also offers the SELV LED transformer 12V/DC 5A with a maximum capacity of 60W from the brand ARUM. It is an excellent solution for powering your LED lighting installations. With its compact dimensions of 170 mm in length, 43 mm in width, and 29 mm in height, it easily fits into confined spaces while offering a maximum power of 60W. Designed for an input of 220V AC and an output of 12V DC in constant voltage, it ensures a stable and secure power supply for your LED projects.

SELV LED Transformer 60 Watts 220V 12V/DC

With protection class II and an IP20 protection rating, this transformer is suitable for indoor use, guaranteeing optimal electrical safety. Its robust casing and screw terminal block allow for simple and durable installation. The SELV (Safety Extra Low Voltage) output ensures safe use, even in demanding environments.

Ideal for residential or commercial LED applications, this transformer from the ARUM brand combines performance, reliability, and longevity. Its standalone operation and robust design make it a suitable choice to meet your LED lighting needs while preserving the lifespan of your installations.