Commercial LED C9 Replacement Bulbs

Going LED is what turns a C9 Christmas light display into something you can put up once and light all season without a second thought. An LED bulb draws under a watt, 90% less than the 7-watt C9 incandescent it replaces so you can safely run longer lines of light.

Long life is the other half of the case. LED bulbs are rated from 20,000 to 60,000 hours with no filament to burn out, which means the same bulbs light your display season after season. Most use a shatter-resistant lens instead of glass, so they stand up to drops, ladder bumps, freezing nights, and wildlife — the everyday hazards that crack glass bulbs outdoors. LEDs draw less than a watt and stay cool to the touch making it safe for pets, kids, wreaths, garland and Christmas trees.

Lower cost to operate, tougher in the weather, and long-lived: that mix is why commercial installers and serious home decorators choose LED C9 bulbs for rooflines, large Christmas trees, driveways and walkways, and any display meant to stay on through the season.

Every C9 LED bulb on this page belongs to one of three lines, each built around a different priority: professional-grade durability and color, a vintage filament look, or the widest color range at a lower price.

OptiCore® is the professional-grade bulb the pros use because it is built for commercial displays and anyone who wants a professional result at home. It is the most durable of the three and the choice for displays that stay outdoors all season. Full details are below.

FlexFilament® is the vintage line. A curved LED filament glows through the lens like an antique Edison bulb, giving your display old-world character with modern LED efficiency. A transparent lens leaves the curved filament in full view, which makes these bulbs a natural fit for patios, porches and anywhere guests stand close. Lightweight PolyFlex PET makes for worry-free, shatterproof bulbs, with select products available with a satin glass lens for a true vintage look. Bulbs are rated for 20,000 hours.

Kringle Traditions® bulbs draw as low as half a watt each, lowering what your display costs to run all season, at a lower price than OptiCore. Surface-mounted LEDs light the lens from end to end, so the bulb looks bright and even from the curb. Shatter-resistant polystyrene means the bulb survives on the roofline and the storage bin with color that never fades, chips or cracks.

OptiCore® is Wintergreen Lighting®'s professional-grade C9 LED bulb, engineered for the durability, color, and connect capacity a season-long outdoor display demands. Polycarbonate is 200 times stronger than glass, and OptiCore's lens is twice as thick as a standard grade LED Christmas bulb for shatterproof durability.

A reflective core spreads light evenly through the polycarbonate lens for rich, saturated color with fewer hot spots. A single surface-mounted LED fills the reflective core, lighting the lens for a fuller, more even glow in every bulb. OptiCore® technology reflects light inside walls molded twice as thick, so color shows saturated across a display instead of glaring from a single point.

At 0.8 watts per bulb, OptiCore draws 90% less than the 7-watt C9 incandescent it replaces, cutting what a full display costs to run — and letting you connect over 1,000 feet of strings end to end on a single circuit. An IP67 rating seals every bulb against dust and water, which means winter weather never reaches the diode. Nickel-plated bases resist corrosion and connect cleanly, saving you time and hassle every season.

Bulbs rated for 60,000 hours which means you will change your design long before you change a bulb. A three-year warranty covers three full seasons, giving you coverage well past the first Christmas. The bulbs are dimmable, so color stays steady and even across the whole display.

C9 LED bulbs come in a full range of colors — warm white, cool white, red, blue, green, amber, gold, pink, purple, and multicolor. Warm white gives the classic, cozy Christmas glow, while cool white is crisper and icier. OptiCore® offers ten colors including a 3000K warm white, giving you the full palette for traditional and modern displays alike; Kringle Traditions® ten colors cover the classic Christmas palette plus the shades most sets leave out, allowing you to match any display; FlexFilament® offers eight colors across warm vintage tones and true Christmas color.

Finish is how the bulb's lens interacts with the light. OptiCore bulbs come in diamond-faceted and traditional smooth opaque finishes, allowing you to match the bulb to the look you are building. Diamond-faceted bulb designs reflect a spectacular light and color halo that carries from a distance, while smooth opaque bulbs give an even, soft glow like a painted or ceramic bulb. On FlexFilament, a satin finished glass lens softens the filament into an even, candle-like glow, creating an elegant look whether the bulbs are lit or not.

Light display is a separate choice. Most C9 LED bulbs shine steady, while twinkle bulbs flash on and off at random for movement across the display. Steady and twinkle versions come in the same finishes, so you can add movement without changing the look of the bulb. OptiCore offers twinkle in warm white, cool white, and multicolor.

Shop C9 twinkle bulbs

The bulbs on this page are sold separately from stringers, so you can replace a burned-out or damaged C9 without buying a whole new light set. Every C9 LED replacement bulb uses the same E17 intermediate base, so any C9 LED bulb screws into any C9 socket, and bulbs come in multipacks so you can keep spares on hand.

That common base makes retrofitting an incandescent display simple. Swap your old incandescent C9 bulbs for LED C9 bulbs in the same sockets, keep your existing stringers, and cut both energy use and heat. Replace all the bulbs in a string rather than mixing LED and incandescent — the two differ in brightness and color, so a mixed string won't look consistent. Because LED bulbs draw so little power, you can usually connect more strings end to end than incandescent allowed.

Starting from scratch or building a custom display? Buy LED bulbs and empty stringers separately for full control over length, spacing, wire color, and color mix. Shop C9 stringers and spools for the sockets, then add the bulbs you want from this page.

Shop C9 stringers & spools

What are the best C9 LED bulbs? The best C9 LED bulb depends on the job. OptiCore® is the most durable and color-rich: a polycarbonate lens 200 times stronger than glass and twice as thick as a standard grade LED Christmas bulb, a reflective core for rich, even color, and a 0.8-watt draw. FlexFilament® wins on vintage Edison-bulb look, Kringle Traditions® on ten colors at a lower price.

How do I convert my incandescent C9 bulbs to LED? All C9 Christmas light bulbs share the same E17 intermediate base, so retrofitting is simple: swap your incandescent C9 bulbs for LED C9 bulbs in the same sockets and keep your existing stringers. Replace the whole string rather than mixing LED and incandescent, since the two differ in brightness and color.

How many C9 LED bulbs can I connect end to end? OptiCore® C9 LED bulbs draw 0.8 watts each, so you can connect over 1,000 feet of lights end to end using a stringer with 12-inch spacing — far more than the 3-5 sets typical of incandescent C9. Kringle Traditions® bulbs draw as low as half a watt.

Are C9 LED bulbs shatterproof? OptiCore® C9 LED bulbs are shatterproof: the polycarbonate lens is 200 times stronger than glass and twice as thick as a standard grade LED Christmas bulb. FlexFilament® bulbs use lightweight PolyFlex PET and are shatterproof too. Kringle Traditions® uses shatter-resistant polystyrene. Select FlexFilament products use a satin glass lens, which is not shatterproof.