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4 Conductor, 18 AWG
3 Conductor, 18 AWG
Guides for designing and building pixel holiday displays: house outlines, MegaTrees, props, controllers and xLights, from HolidayCoro.
Updated September 2026. This post was rewritten around pixels, which have replaced dumb RGB for nearly every holiday project.
We often get asked how many lights can be connected to a controller, what power supply to use and what wire to run. This post answers those questions for pixel lights and pixel controllers.
A word of caution first: if you get the power side wrong, the results range from flickering lights to damaged hardware and, in the worst case, a fire. Don't "wing it." If you'd rather just have the answer, fill out our project design form and we'll put together a recommendation and a complete quote, or start with one of our Ready2Run packages, where the power math is already done.
The key is to see the lights and the controller as parts of one system:
Pixels → Pixel wiring → Controller → Power wiring → Power supply
Let's work through the chain.
Everything starts with the lights, because every other part is sized to them. When choosing pixels, consider:
Always figure power at full white (red, green and blue all on), since that's the most a pixel can draw.
This is the wire between each pixel in a string, or the circuit board in a strip. It carries power from the controller down the run, and it's where most power problems start.
There's no standard here. One vendor's nodes may use thick 18 AWG wire while another's look identical but use thin 22 AWG. Thinner wire loses more power over distance, so the pixels at the end of the run get less voltage than the ones at the start.
Ideally, your vendor tells you how many pixels can run before you need to inject power. Our 100-count 12mm node strings, for example, are designed to run the full 100 nodes with power fed at the start. If your vendor doesn't publish this, measure it yourself: set the run to full white for 15 to 30 minutes, then measure the voltage at the first and last pixel with a meter. A drop of 10 to 20% is usually fine. Much more than that and you'll see dimming, color shift or random flicker at the end of the run.
When a run is longer than the pixels can carry power, you inject power: run heavier wire from the power supply to a point partway down the run and connect it to the string's power and ground there. The data passes straight through.
A pixel controller receives data from your sequencing software over your network (E1.31) and sends it to each pixel. It also passes power from the power supply through to each output. When sizing a controller, check:
Don't size by the fuse. The fuse is there to protect against a short, not to tell you how much the output can carry.
Our Controller Selection Wizard will match a controller to your pixel count and power, or see our Ready2Run pixel controllers.
This wire carries power from the power supply to the controller, and to any power injection points. Size it by two things: the total power of every pixel it feeds, and the distance it has to run. Two controller outputs of 55 watts each need a wire that can carry 110 watts over that distance. Our technical guide to wire selection has the charts.
The power supply is the last thing you choose, and it's simple once the rest is done:
See our power supplies.
Work from the pixels up: count your pixels, figure watts at full white, split long runs or plan power injection, pick a controller with enough outputs and capacity, size the wire and pick a supply with headroom. For a complete worked example on a real house, see our detailed house outline design guide.
Related posts:
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Updated September 2026. We rewrote this guide around the pixels, mounting and controllers we recommend today. The original 2013 version was built around pixel strip and hardware that has since been replaced.
When you're planning a Christmas display, it's easy to focus on everything going in the yard. But the biggest prop is already there: your house. Outline it, and the house becomes part of the sequence, framing everything you've built in front of it.
Vineyards Lights, Meridian, ID. The rooflines, peaks and garage all become part of the show.
If you want the big picture first (why a mounting system matters and how to pick between seasonal and permanent), start with our house outline primer. This post is the step-by-step design: how to measure, how many pixels you need, how to power them and where the controller goes.
Would you rather have us do the math? Fill out our project design form and we'll send you instructions for sending us one photo of your house and your measurements. We'll put together a recommendation and a complete quote with the controller, mounting, hardware and accessories for your project.
Go outside and take a photo of your house from where your audience will see it, usually the street. You'll sketch your design on this photo and use it to record measurements, where cables will run and where the controller and power supplies will go.
We'll use Nathanial R.'s house as our example throughout. It has 19 separate rooflines, so it's a good example of how a house with complex roof lines can be handled.
Get out the ladder and tape measure and record the exact length of every section you want to outline. Write each one on the photo.
Accuracy matters. Every foot you miss is another 4 pixels at 3 inch spacing, which changes your pixel count, your power budget and possibly how many controller outputs you need.
Across a whole house, mounting pixels one at a time means a lot of clips, a lot of alignment and a lot of visible black wire. A mounting system lets you build the outline in sections that hold their spacing and aim, snap into a few clips and come down as a unit for repairs.
Want it to come down after Christmas? Use Pixel Pipe. Each aluminum pipe is 7.3 feet long with 88 holes on 1 inch centers, sized for standard 12mm bullet pixel nodes. It's available in black, white or mill-finish grey, mounts with clear, UV-resistant clips that can stay on the house year-round, and rotates in its clips so you can aim the pixels toward your viewing area. Couplers, corners and tees let you follow the roofline.
Want it to stay up? Use PixaTrack. Each track is 6.66 feet long with 80 holes on 1 inch centers and takes 12mm bullet or square-neck nodes. It fully encloses the wiring to protect it from UV and animals, comes in off-white or brown to blend with the house, and is available with front-facing or side/down-facing holes.
Both come as samples, so you can hold one up against your house before you decide.
Because both systems are drilled on 1 inch centers, you can space pixels at 1, 2, 3 inches or more by skipping holes. Two things set how far apart you can go:
The math is simple:
Pixels = run length in inches ÷ spacing in inches
DMX channels = pixels × 3
For Nathanial's house we grouped the 19 measured sections into four continuous runs and used 3 inch spacing:
| Run | Length | Pixels (3" spacing) | DMX channels | Watts at full white |
|---|---|---|---|---|
| Garage front | 26 ft | 104 | 312 | 57 |
| Garage, over the doors | 34 ft | 136 | 408 | 75 |
| Front of house, upper | 53 ft | 212 | 636 | 117 |
| Front of house, lower | 31 ft | 124 | 372 | 68 |
| Total | 144 ft | 576 | 1,728 | 317 |
At 170 pixels per DMX universe, 576 pixels needs 4 universes. Any current E1.31 pixel controller handles that over a single network cable.
Our 12v, 12mm nodes draw about 0.55 watts each at full white (45 milliamps). That's where the watts column above comes from: 576 pixels × 0.55 W = about 317 watts, or roughly 26 amps at 12 volts. Size your power supplies with headroom above that number, since draw varies with temperature, wiring and supply voltage.
The second question is how far the power can travel. As power runs down a string, voltage drops through the LEDs and the wire itself. Our 100-count node strings are designed to run the full 100 nodes with power fed at the start. Past that, plan to inject power. Three of the four runs above are over 100 pixels, so each would get power injection partway along, or be split into two shorter runs fed from separate outputs.
To inject, run heavier-gauge wire (14 AWG is a good start) from the power supply to the injection point and connect it to the power and ground of the string there. The data passes straight through, since each pixel regenerates it. See our guide to wire selection for sizing the injection wire.
Test before it goes on the house. Build a section, set it to full white for 15 to 30 minutes and measure the voltage at the controller output and at the last pixel with a multimeter. A drop of 10 to 20% is usually fine. Much more than that and you'll see dimming or color shift at the end of the run, or random flicker if the voltage falls below what the pixel chips need. Finding that on the ground is a lot easier than finding it on the roof.
Look at your photo for where runs start and end. Places where two runs meet, like a garage corner or the peak over a front door, are natural spots to feed two outputs from one location. Current pixel controllers and sequencing software let you reverse a run's direction, so a run can start at either end.
The data signal from a pixel controller output only travels a limited distance to the first pixel, so you have two basic layouts:
For Nathanial's four runs and about 317 watts, a single 4-output controller placed near the garage corner would handle the whole outline. Adding props later, or splitting the long runs, is where a 16-output controller or a Flex system with receivers starts to make sense. Our Controller Selection Wizard walks you through the options.
One of the biggest advantages of Pixel Pipe and PixaTrack is that you can build each section on the ground, plug it in and test it before it goes up. With connectors between sections, a problem later means unplugging one section, fixing it in the garage and putting it back without disturbing your spacing. With a seasonal install, the sections come down as a unit and go back up next year exactly as they were.
Our house outline video walks through planning and building an outline with Pixel Pipe and PixaTrack from start to finish:
You don't have to work out every part of the system yourself. Fill out our project design form and we'll send you instructions for sending one photo of your house and your measurements. We'll look at what you're planning and put together a recommendation and a complete quote with the controller, mounting, hardware and accessories you'll need.
Want to see the mounting in person first? Pixel Pipe and PixaTrack samples let you compare colors against your house before choosing a system.
HolidayCoro.com
Updated September 2026.
The short answer today: go with pixels.
When we made the video below, dumb RGB and smart pixels were both reasonable choices depending on the project. That's no longer the case. The cost of pixels has come down so much, and pixels can do so much more than dumb RGB, that dumb RGB is now rarely used in holiday displays. If you are not using dumb RGB now, stick with pixel products.
Dumb RGB (also called basic RGB) lights can change color, but every light connected to the same controller output changes together. A whole string or strip is always one color at a time.
Smart RGB, or pixels, are individually controlled. Every pixel, or small group of lights, can be a different color at the same moment. That's what makes chases, waves, text, pictures and all the effects you see in modern displays possible.
There are still a few spots where dumb RGB makes sense, like simple flood lighting that only ever needs to be one color at a time, or expanding a dumb RGB setup you already own. For anything new, choose pixels.
The video below still does a good job explaining how the two types work, even though the recommendation has changed since it was made.
See our pixel lights and pixel controllers, read where to start with a new pixel project, or fill out our project design form for a recommendation and quote.
HolidayCoro.com
Updated September 2026. This post was rewritten around the permanent mounting and control options available today.
Once people get into pixels, a common next step is mounting them on the house permanently instead of putting them up and taking them down every season. It makes sense: pixels are small enough to hide under a soffit, and because they can be any color, the same lights work for Valentine's Day, St. Patrick's Day, the Fourth of July, game days, Halloween and Christmas, with warm white architectural lighting in between.
PixaTrack (right) is built for permanent installs and comes in off-white and brown.
A seasonal install can get away with clips and exposed wire for a month. A permanent install lives through summer sun, winter storms and every squirrel in the neighborhood, year after year. That's what PixaTrack was designed for:
PixaTrack installed on a white soffit.
Reliability of the lights.
Much of the pixel hardware on the market is built with price as the main driver, and that usually shows up in long-term reliability. Over the years we've seen plastics and potting compounds that yellow or crack from heat and UV, LEDs that don't tolerate voltage swings, and wire insulation that breaks down after a few seasons outdoors. Something that survives a month in December may not survive year-round. Enclosing the pixels' wiring in track helps a lot, but start with quality pixels.
Power supplies and controllers.
Pixels run on low-voltage DC, so you'll need power supplies, and both they and the controller need a spot that stays dry but still gets airflow. Don't run a power supply at or near its rated maximum; leave 10 to 20% headroom so it isn't working at its limit every night of the year. Also keep the controller reasonably close to where the runs start, or use long-range receivers so the outputs can sit near the roofline.
Running the lights when there's no show.
Between holidays, you'll want the lights to come on by themselves: warm white every evening, team colors on game day, red, white and blue for the Fourth. The easiest way is FPP (Falcon Player), free show-player software that runs on a small computer like a Raspberry Pi. You build your looks and sequences in xLights, and FPP runs them on a schedule all year without a PC.
Codes and wiring.
A permanent install often means permanent AC power to the power supplies. Extension cords that are fine for a month-long seasonal display are not meant to live outdoors year-round. Check with your local building code office about the requirements for permanent low-voltage lighting and the AC circuits that feed it, and use an electrician where required.
Temperature range.
If you live somewhere with extreme heat, cold or sun, check the rated operating range of the pixels, power supplies and controller against your climate.
Fill out our project design form and we'll put together a recommendation and a complete quote with the PixaTrack, pixels, controller, power and accessories you'll need.
For the full design process, see our house outline primer and detailed design guide.
HolidayCoro.com
Updated September 2026. This post replaces our original 2013 primer with how we recommend outlining a house today.
When you're planning a Christmas display, it's easy to focus on everything going in the yard.
But the biggest prop is already there: your house.
A yard full of props can already make a great show. Outline the house behind them, and now the house becomes part of the sequence too. It frames everything you've built in front of it and gives you a much bigger canvas to work with.
Here's one from a HolidayCoro customer:
Landry Lights, Hudson, NH. This is a great example of why the house itself can become such a big part of the display.
And when you're putting that many pixels across a house, how you mount them starts to matter.
You can absolutely hang pixels individually. But across an entire house, you're now dealing with a lot of individual pixels, clips, alignment, and visible black wire.
A mounting system turns that outline into sections you can build once and work with as a unit.
1. Keep the spacing, and the look, consistent.
Instead of positioning and angling every pixel individually on the house, the mounting keeps them at the spacing and orientation you set. You can commit to the look you want, with pixels facing outward for a clean, defined outline or oriented toward the house for a wall-wash effect, without ending up with a mix of both along the same run.
2. Deal with a lot fewer individual clips.
A whole section can snap into a few clips instead of attaching pixels one at a time across the house.
3. Keep the installation cleaner-looking.
Pixel Pipe (seasonal) and PixaTrack (permanent) keep the pixels and wiring organized instead of leaving loose black pixel wire running along the house. That makes the installation less noticeable when the lights are off, too.
4. Bring repairs down to the garage.
With connectors between sections, you can unplug a section, bring it down, make the repair, and put it right back where it was. Your spacing stays intact.
5. Make the next installation easier.
With a seasonal installation, the sections can come down and go back up without starting over on pixel spacing and alignment, or moving the ladder for every individual pixel.
You can also build and test Pixel Pipe and PixaTrack sections on the ground before they go on the house.
Casey's 2025 display, before and after. Notice what happens when the house joins the display. The roofline gives the whole show a frame and connects the props in the yard to the house behind them.
Vineyards Lights, Meridian, ID. Look at how much of this display comes from the house outline itself. The rooflines, peaks, garage, and other architectural details all become usable parts of the show.
The first choice is pretty simple.
Pixel Pipe is built for seasonal installations. The clear, UV-resistant clips can stay on the house year-round, so your completed sections are ready to go back up the next season.
Pixel Pipe can also rotate in its clips, letting you dial in the direction the pixels face toward your viewing area.
Get Seasonal Mounting: Pixel Pipe
PixaTrack is designed for permanent installations. It fully encloses the wiring, keeping it away from squirrels and other animals while protecting it from UV damage.
The wiring stays out of sight, and PixaTrack is available in off-white or brown to help it blend with the house, which can also help with HOAs.
It's available in front-facing and side/down-facing versions depending on how you want the pixels positioned.
Get Permanent Mounting: PixaTrack
You don't have to work out every part of the system yourself. Fill out our project design form and we'll send you instructions for sending us one photo of your house and your measurements.
We'll look at what you're planning and put together a recommendation and a complete quote with the controller, mounting, hardware, and accessories you'll need for your project.
We offer Pixel Pipe and PixaTrack samples so you can see the mounting in person, compare the colors against your house, and get a feel for how it will look before choosing a system.
Our house outline video walks through the planning process from start to finish:
Want to run the numbers yourself? Our detailed house outline design guide walks through measuring, pixel counts, power, and controller placement step by step.
HolidayCoro.com
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