Stand at the end of any block in Wheaton or Orland Park in mid-December and you can sort the houses into two groups from a hundred yards away. Some have a crisp, unbroken line of light tracing the roof. Others have a soft, shimmering fringe hanging down from the eave. That is the icicle lights vs. C9 roofline lights question, and it is settled long before anyone opens a box — it is settled by the shape of the roof.
Here is how the two actually differ, and which one belongs on the kinds of homes the Chicago suburbs are built out of.
The core difference: a line versus a curtain
A C9 bulb is the large, classic strawberry-shaped bulb, spaced along a single strand and clipped so each bulb sits upright along the gutter or shingle edge. It produces one continuous, evenly spaced line of individual points of light. It draws your roof.
Icicle lights are strands of hanging drops of varying lengths, suspended from the eave so the light falls downward in a fringe. They produce a soft, textured curtain. They do not draw the roof — they hang from it.
That is not a quality difference, it is a design difference. But it has consequences.
How each one reads from the street
C9 is architectural. Because it is one clean line with consistent spacing, it emphasizes the shape of the house — the gables, the peaks, the way the roof steps down over the garage. On a home with good geometry, a C9 outline makes the architecture the display. It also reads clearly from a long distance, which matters on deep-set lots and wide suburban streets.
Icicle is atmospheric. It softens the roof edge rather than defining it, and it reads best from closer range — from the sidewalk, from the driveway, from a front window. At distance, the varying drop lengths blur into a general glow rather than a shape.
There is one more honest difference: C9 photographs well and icicle rarely does. If curb appeal for a real estate listing or holiday party photos is part of your motivation, that is worth knowing.
Which roofline suits which
This is where most of the decision actually gets made.
Steep, multi-gable roofs — colonials, Tudors, most newer construction. C9, almost every time. These homes have real geometry to trace, and a clean outline running up and over each gable is the single highest-impact thing you can do to them. Icicle on a steep, complex roof tends to look cluttered, because the drops fall at inconsistent angles against the pitch.
Long, low ranches and split-levels. This is where icicle earns its place. A wide, shallow eave gives you one horizontal run and not much else, and a plain C9 line across it can read as thin. The vertical texture of an icicle fringe adds body to a facade that otherwise has none. Plenty of ranch homes around Arlington Heights and Downers Grove look better in icicle than in C9.
Deep-overhang or Prairie-influenced homes. C9 along the eave line, with no contest. A deep horizontal overhang lit as a single strong line is one of the most striking effects in holiday lighting, and hanging drops off it obscures the exact feature that makes the house interesting.
Homes with porches, covered entries, or second-story overhangs. Frequently both. C9 to outline the main roof, icicle over the porch to give the entry a soft, welcoming texture. Mixing is not a compromise — it is often the right answer.
If you are unsure which your house is, that judgment is the first thing we make on a design walk. It is also free — you can request a free holiday lighting quote and get an actual recommendation for your specific roofline rather than a guess from a catalog.
Durability: an Illinois-specific verdict
Design preference aside, the two behave very differently over a Chicago suburbs winter.
C9 strands sit flat against the gutter or shingle line, clipped at regular intervals. There is very little for wind to grab, and a properly clipped run is largely indifferent to a 40 mph gust off the plains.
Icicle strands hang free, which means wind moves them constantly. Over eight weeks of Illinois winter, that motion works connections loose, tangles adjacent drops, and puts stress on every attachment point. Add ice load — and icicle strands collect ice far more readily than a flat C9 run, because there is far more exposed surface hanging in the weather — and the failure rate climbs.
This is the practical case for professional installation of icicle in particular. Consumer icicle strands hung by hand in November are the displays most likely to be visibly ragged by New Year's. Commercial-grade icicle, properly spaced, correctly attached, and covered by an in-season repair guarantee, holds up. The retail version usually does not.
Cost: closer than people expect
Homeowners often assume icicle is the budget option because retail icicle strands are inexpensive. At professional grade, the two land closer together than that, and icicle can run higher.
C9 pricing follows linear footage fairly predictably. Icicle uses substantially more bulbs per linear foot of eave — you are lighting a plane, not a line — and takes longer to hang evenly, because getting the drop lengths to look intentional rather than random is fussy work. The material and labor tend to offset the lower per-strand price.
What genuinely changes the number in both cases is roofline length, home height, and access, not bulb style.
Side by side
| C9 roofline lights | Icicle lights | |
|---|---|---|
| Visual effect | Crisp, continuous architectural line | Soft, hanging curtain of light |
| Best for | Steep, gabled, multi-plane roofs; deep overhangs | Long, low ranches; split-levels; porches and entries |
| Reads from a distance | Excellent | Fair — blurs into a glow |
| Wind and ice performance | Strong; sits flat, little to catch | Weaker; hangs free, catches ice and wind |
| Photographs | Very well | Poorly |
| Professional install matters | Yes | Even more |
Frequently asked questions
Are icicle lights out of style?
No, but they are used more selectively than they were twenty years ago. Icicle has largely moved from being the default roofline treatment to being a deliberate choice for wide, low eaves and covered porches, where its texture genuinely improves the facade.
Can you mix C9 and icicle lights on the same house?
Yes, and it is often the strongest option. A common approach on Chicago suburbs homes is C9 tracing the main roofline for architectural definition, with icicle over a porch or covered entry to soften the approach.
Which holds up better in a Chicago winter?
C9, clearly. It clips flat against the gutter or shingle line with little exposed to wind, while icicle strands hang free, collect ice, and take constant wind movement that works connections loose over an eight-week season.
Do C9 lights use a lot of electricity?
Not in LED. The C9 bulbs used in professional installations are LED, not incandescent, and draw a small fraction of what the old bulbs did — the size of the bulb is about the look, not the power draw.
Get the recommendation before you buy anything
The right answer for your home depends on your roof pitch, your eave depth, how far back you sit from the street, and whether you have a porch worth softening. That is a ten-minute judgment for someone who does this every day — and it is worth making before you spend money in either direction.
Twinkle Bros Lighting handles professional christmas light installation across the Chicago suburbs with commercial-grade C9, C7, mini, and icicle product, gutter-safe clip attachment, a full-season repair guarantee, and January takedown included. Book your design walk in October while pre-Thanksgiving install dates are still open — call (708) 316-4569 or request a free holiday lighting quote and find out which one your roofline was built for.