How to Size a Transformer for Landscape Projects | DEKOR Lighting

Dimmable 100 Watt Low Voltage LED Transformer by DEKOR.

Lighting is an essential part of any landscape design. Not only does it make your space a little bit safer, but it can also help to create a welcoming atmosphere. In order to get reliable light output, you’ll need to choose the right size transformer. But how exactly do you size a transformer? Not only will we share the answer to that question, but we’ll also share some tips on where to find the best transformers on the market.

What is a Transformer?

For those who don’t know, a transformer is an electrical device that steps down the voltage from your home’s main line (usually 120 volts) to a lower voltage. This is important because landscape lights typically require 12 volts. Using a transformer to lower the voltage not only protects your lights, but also makes them more energy-efficient.

3 Steps to Sizing Your Landscape Lighting Transformer

60 Watt Low Voltage Transformer for LED Lights by DEKOR Lighting.

With a solid understanding of what a transformer is, let’s move on to how to size one for your landscape lighting needs. 

  1. Consider the wattage of your lights
  2. Determine how much voltage you need
  3. Choose between magnetic and electronic

We’ll go into more detail on each of these steps below.

1. Consider the Wattage of the Lights

The first step is to determine how many watts your landscape lights will use. To do this, you’ll need to know the number of light bulbs and their wattage. Once you have that information, simply multiply the number of bulbs by the wattage. So, if you have 10 light bulbs that are each 15 watts, then your total minimum wattage would be 150 watts. If your total wattage is equal to the max transformer wattage capacity, we suggest stepping up to the next size transformer.

2. Determine How Much Voltage You Need

Low voltage lighting is safe, efficient, and long lasting. Most landscape lights operate on just 12 volts of electricity while others may require up to 24 volts. To determine how many volts your specific lights need, check the packaging or manufacturer’s website. The required voltage should be clearly displayed.

3.Choose Between Magnetic and Electronic

Having determined how many watts and volts your landscape lighting system will require, it’s time to select the right transformer type. The two main types of transformers are magnetic and electronic.

Magnetic Transformers: These types of transformers are the most common and typically the most affordable. They’re also easy to install and are compatible with most landscape lighting systems. The downside is that they’re not as efficient as electronic transformers and they can be a bit bulky.

Electronic Transformers: These transformers are more expensive than magnetic ones, but they’re also more efficient. They’re smaller in size, which makes them easier to conceal, and they have a longer lifespan.

With all of the previous information, you’re ready to choose the right transformer for you. 

Calculating Your Transformer Size Doesn’t Have to Be Hard

If you’re not a number person, sizing a transformer for your landscape lighting may seem like a daunting task. Luckily, there are calculators out there that can do the work for you. All you need to know is the number of light bulbs and their wattage. Once you have that information, simply plug it into a transformer calculator and it will do the rest.

Dekor Lighting, a premier provider of high-quality landscape lighting, has a high-tech transformer calculator on their website. 

Screenshot of DEKOR’s transformer calculator.

It shows all of the lighting models we offer along with the number of watts they produce. Just enter how many of each light you intend to hook up to the transformer. At the bottom of the calculator, you’ll see all of the transformer types available through DEKOR and a percentage denoting how much capacity your lighting project would take up for each transformer. There’s no easier way to size a transformer.

Take a few minutes and play around with the number of lights and find the perfect transformer for your needs.

Transformers are Not All Created Equal

DEKOR transformers are specially manufactured to be super efficient and long-lasting. They have a wide range of features that make them ideal for any landscape lighting project, big or small.

Some of the features that make DEKOR transformers stand out from the rest include:

  • A wide range of wattage options
  • Dual output leads for versatility
  • IP66 waterproof rating.
  • Multiple cord length options
  • Easy installation
  • Protection from short circuits, overheating, overloads, and more.

Here’s a list of all of DEKOR’s Transformers. Feel free to take a look and compare them:

Now you know how to size a transformer for your landscape lights. With a little bit of planning and a nifty calculator, you can easily find the right transformer for your project. 



Yes, DEKOR® manufactures all circuitry in Denver, CO providing excellent quality.

DEKOR® offers a COLORKONNECT WiFi controller and through the app you can dim the lights, change colors, and set schedules. You may also control light colors with dimming capability manually on the front face of the COLORKONNECT WiFi device.

When using the COLORKONNECT WiFi controller app provides you the ability to control your lights regardless of where you are located.

The 3W4PORT splitter/repeater has two functionalities: the splitter is used to connect the power wire and the three additional ports for 2-3 lights based on your lighting plan. The repeater is to be used every 20’ with long cable runs and at the light connections to enhance the signal creating pure colors from the first light to the last.

DEKOR® offers a simple 3W4PORT Plug-N-Play system with various cable lengths to make the install easy in any application.

You may change colors and dim the lights manually on the COLORKONNECT device.

Yes, with the use of two or more COLORKONNECT WiFi controllers and wiring two or more zones will deliver different light color patterns.

You may power up to 60-watts of light usage or 28 individual lights.
Our lights are 46% brighter and we have a dedicated pure white channel.
We offer a variety of lengths for any application—20”, 5’, 10’ and 20’.

Yes, you can add to your current non-RGBW DEKOR® lighting system by adding RGBW lights!  While the non-RGBW DEKOR lighting system is a 2-wire direct current system, and the RGBW DEKOR lighting system is a 3-wire direct current system, you are able to integrate both systems by creating a separate zone.  Either using a splitter running from you current transformer or upgrading to a 100 or 200 watt transformer, which has more than one output from the transformer, you can create an additional zone or zones.  Please call us if you need us to walk you through this!

The transconnect cable is for our standard DEKOR® Lighting 2-wire lights. The COLORCONNECT WiFi controller is a 3-wire system. The male-to-male cables come in lengths of 20”, 5’, 10’, 20’ are to be used to connect the COLORCONNECT WiFi controller and then to your first light.

For our RGBW system: The 36-watt and the 60-watt transformers will include one (1) 20’ 3WPNP male-to-male cable. The 100-watt transformer will come with (1) transconnect cable and (1) 20’ 3WPNP male-to-male cable. The 200-watt transformer will include (1) 20’ transconnect cable with two lead wires and (1) 20’ 3WPNP male-to-male cable.

The 3W4PORT splitter/repeater may only be used with the RGBW system. The 6-port splitter is a two wire and can only be used with our standard DEKOR® Lighting system.