C9 bulbs vs permanent LED lights: how the look differs

The short answer

The difference between C9 lights and permanent lights comes down to the size of each point of light. A C9 is a real bulb, big enough to see as an object, and its faceted cover spreads the glow around it. A permanent system uses small diodes sitting in an aluminum channel, so each point is sharp and the whole run reads as one drawn line along the roof edge.

Neither is better in the abstract. The C9 look is warm, chunky and familiar, and plenty of people want exactly that for the holidays and nothing on the house the rest of the year. The permanent look is cleaner and more architectural, and it comes with color control, schedules and a daytime look that blends into the trim. We offer both, as a seasonal C9 lease and as permanent roofline lighting, so this guide is about which one suits your eye and your house, not which one to sell you.

Choosing between C7 and C9 bulbs is a separate question. Here we compare a C9 display against a permanent channel.

The C9 look: big, faceted, classic

A C9 is a cone-shaped bulb a little over an inch wide at its widest point (the exact sizing is in C7 vs C9 Christmas lights), big enough to read as a bulb from across the street, not just as a spark. On a brick ranch or a two-story colonial, that bulb body is what makes the roofline read as a holiday display from the road.

The faceted LED versions matter to the look. The cut surface breaks the light up and throws it around, and one maker lists its faceted C9 at a 360 degree beam angle. So each bulb glows from its whole body, catches light like cut glass up close, and throws a soft halo onto the fascia and gutter behind it.

What that gives you on the house:

• Presence. Each bulb is a distinct object, so even a single eave line looks full and generous.
• Glow on the trim. The halo washes the boards around each bulb, which warms up brick, stone and dark siding.
• A handmade rhythm. Bulbs, gaps, bulbs. The spacing is part of the charm, and it is what makes a C9 roofline read as a holiday display rather than architecture.
• Classic multicolor. A run of mixed colored C9s is its own look, and on a Tudor gable it is hard to beat for pure December nostalgia.

The catch is that the look belongs to one season. The bulbs go up in November and come down in January, and that is exactly what some people want.

The permanent look: a clean line of points

A permanent system is built differently. The fixture is a slim aluminum channel of commercial-grade RGBW LEDs, mounted on the fascia board or tucked beneath the drip edge. There is no bulb body to glow, just a small diode at each node, and those points follow the roof edge as one straight, rigid line.

A bare LED is a directional light source: it sends light in a specific direction rather than all the way around, the way an incandescent bulb does. An LED C9 hides its diode inside a faceted cover that spreads the light back out. A permanent channel leaves the diode bare and facing out from the house. You see bright, crisp points and far less halo on the boards around them. It reads less like a string of bulbs and more like the roofline itself has been drawn in light.

• Precision. The channel is rigid, so there is no sag between points and no bulb leaning off a clip. Corners and peaks meet as clean angles.
• Color on demand. One fixture handles both warm white and full color, so the same line can be soft white on an ordinary night and multicolor for Christmas week.
• Less glow, more line. Because the diodes are small, the look is lighter on the house. That suits modern trim and busy rooflines, and it can feel a little thin to someone who loves the fat C9 halo.

Spacing and how it reads from the street

Spacing is where the two looks part ways most. On a C9 display, spacing is a design choice. Commercial C9 stringers come with sockets anywhere from 6 to 24 inches apart, and a wider spacing gives the spaced-out, old-fashioned look while a tighter one makes the line feel fuller. On a permanent system, you do not pick a spacing run by run. The diodes are part of the fixture, so the pattern of points is the same wherever the channel goes.

Distance matters too. On a two-story colonial, the eave is far enough from the sidewalk that the gaps in a C9 run shrink and the bulbs merge into a softer string. On a ranch, the eave is close and low, so every bulb and every gap is right at eye level. That low, close eave is where a C9 display looks most like the classic picture, and where a permanent line looks most like trim detail.

You can try this on your own roofline. In the LightCast measuring tool, open Fine tuning and move the bulb size and bulb spacing sliders. Big and wide leans toward the C9 feel. Small and tight shows the permanent line.

In photos

Most people judge their lights by the phone photos they take at dusk.

C9 bulbs photograph well almost by default. Each bulb has enough body to hold its color, and the halo on the fascia gives the picture warmth. Multicolor C9s in particular stay readable as red, green, blue and gold, even at a distance. The weak spot is detail. Up close, a phone in night mode can smear the facets into a plain blob.

Permanent lights photograph as a clean graphic line, which looks sharp in a wide shot of the whole house. The weak spot is brightness. Small, intense points can blow out to white in a phone picture, washing out the color you picked. Because brightness is set from your phone, the fix is easy: turn it down for the photo and shoot soon after sunset, while the sky still has some blue in it.

1. Stand across the street, level with the middle of the house, so the whole roofline is in frame.
2. Shoot early in the evening, before the sky goes fully black.
3. Tap the brightest part of the roofline to set focus, then drag the camera's exposure slider down until the color comes back. On a permanent system you can also dim the lights from the app for the shot.

Day look: strands vs channel

By day, the two looks are nothing alike. A C9 display is a row of bulbs on clips with wire running between them. Along a gutter it is plain to see, and after a snowfall the bulbs poke up through the white. For a lease that runs from November to January, that is fine. It is part of the season, and it all comes down before the snow is gone.

A permanent channel is color-matched to the trim it sits on, so by day it reads as part of the fascia line from the street. Stand right below a low garage eave and the diodes do show. Our guide to permanent lights in daylight walks through white, dark, brick and stone trim one at a time.

That daylight difference is the heart of the choice. If you would rather see nothing on the house from January to November, a C9 lease takes everything away. If you would rather have lighting ready on any evening of the year, the permanent channel stays and blends in.

Which to pick for your house

Start with the look you picture when you close your eyes, then check it against the house. Some fits are clear:

• You want December and only December. Pick the C9 lease. We design the display, custom-cut runs to your roofline, hang it in November with clips that protect shingles and gutters, repair outages in season, and take it down and store it in January. Custom-cut C9 runs vs store strands explains why the cut matters to the look.
• Old wood trim you would rather leave untouched. The C9 lease again. Near downtown Rochester, where many houses keep original wood fascia, we inspect that trim first. If the old wood is better left without fasteners, we tell you and recommend the lease.
• A Tudor or a steep-gabled house. Either works. C9s give the gables a rich, storybook glow. A permanent line draws the gables as clean angles, in warm white most nights. In Grosse Pointe, where warm white on the architecture is the local standard, both can be set up to match it.
• You want color beyond Christmas. Only permanent does that, with warm white and full color from one fixture.
• You are moving soon. The lease. Nothing stays on the house.

Cost follows the look. On a 180 foot colonial front, a permanent system runs $4,000–$6,100 once, and a C9 lease runs $3,200–$5,800 per year. On a 130 foot house, it is $2,900–$4,400 once for permanent, or $2,300–$4,200 per season to lease. If you are still weighing the permanent option, read the downsides of permanent Christmas lights first.

Whichever look you lean toward, the footage is the same. Snap the front of the house from across the street, load it into the LightCast roofline tool, and both prices come from one measurement. Then ask for an estimate and tell us whether you picture big C9 bulbs or a clean permanent line.

Where this applies

Typical roofline lengths and priced examples for these communities are on their own pages.

• Grosse Pointe
• Rochester

Sources

1. Christmas Lights, Etc: C7 and C9 bulbs (C9 socket spacing options) christmaslightsetc.com
2. Super Bright LEDs: C9 diamond faceted LED bulb specifications superbrightleds.com
3. ENERGY STAR: Learn about LED lighting energystar.gov