C7 vs C9 vs LED Mini Lights: Which Bulb Types Should You Stock as a Contractor

Most holiday lighting contractors stock whatever they personally like or whatever their first supplier happened to carry. That's how you end up with a van full of C9s nobody asked for, or a pile of mini lights that eat install time on commercial jobs. The smarter move: stock based on what actually sells in your market, what installs fastest, and what holds the best margin. Here's how C7, C9, and LED mini lights stack up on all three.

What's the actual difference between C7, C9, and LED mini lights?

C7 bulbs are the mid-size classic — roughly 1.5 inches tall, typically spaced 12 inches apart on SPT-1 wire. C9 bulbs are larger (about 2 inches tall), spaced 18–24 inches apart on heavier SPT-2 wire, and throw a noticeably bolder look. Both come in incandescent and LED versions. LED mini lights (also called fairy lights or string lights) are the small, densely-spaced strands — usually 50–100 count — used for bushes, wreaths, garland, and detail work.

Each format has a distinct visual role. C9s are rooflines and dramatic outlines. C7s handle mid-size outlines and trees. Mini lights fill in texture and volume. When you stock all three, you can bid complete jobs instead of piecing together what you don't have.

Which bulb format sells the most and to whom?

C9 LED is the dominant format for residential roofline installs — it's what most customers picture when they call you. The larger footprint means fewer bulbs per linear foot, faster install, and a bold look that reads from the street. It's the format you should stock deepest.

C7 LED has strong demand for mid-size trees, columns, and commercial window outlining. It's also the format many customers already own in incandescent, creating upsell opportunities to swap them to LED on a service plan.

LED mini lights are near-universal for shrub wrapping, garland, and indoor installs. They're lower ticket per strand but high volume — a single commercial account can burn through 30–50 strands.

A useful rough split for a solo or two-person operation starting out: stock roughly 50% C9 LED, 30% C7 LED, and 20% mini lights by strand count. Adjust from there as you learn what your specific market requests.

How do the margins compare across bulb types?

Margin is where these three formats diverge most.

C9 LED tends to carry the best margin per linear foot. You're buying heavy-gauge wire and larger LED capsules — your cost per strand runs higher, but so does what customers expect to pay. Typical contractor cost for C9 LED on commercial-grade SPT-2 wire runs roughly $0.35–$0.65 per foot depending on bulb count and supplier. You can charge customers $3–$6 per linear foot installed in most markets, with coastal and high-cost-of-living markets landing at the top of that range. Regional labor costs move these numbers significantly — verify your local rate before quoting.

C7 LED sits slightly lower in both cost and charge rate — roughly $0.25–$0.50 per foot in product cost, billed at $2–$5 per linear foot installed. Margins are still solid, especially when you're doing volume.

Mini lights have thin per-strand margins on their own. Where you protect margin is by bundling them into a full install quote rather than pricing them a la carte. A shrub-wrapping add-on shouldn't be priced strand-by-strand — price it as a flat add-on to a roofline job and the math improves considerably. For a full breakdown of how to structure your install pricing, see How to Price Holiday Lighting Installations: A Complete Guide for Solo Operators.

Incandescent vs. LED: should you carry both?

Short answer: stock LED, and convert incandescent customers when you can.

LED bulbs use 70–80% less power than comparable incandescent. That matters to customers when you explain it, and it matters to you operationally — LED strands run cooler, fail less often during a season, and reduce your callback rate. Fewer callbacks protect your schedule and your reputation.

That said, some customers have existing incandescent infrastructure they've paid for and don't want to replace. Carrying a small stock of C7 and C9 incandescent replacement bulbs lets you service those accounts without turning away work. Just don't build your business around it — incandescent is a shrinking category. The U.S. Department of Energy's guidance on LED efficiency is worth referencing when customers push back on the cost difference.

Which bulb type installs fastest?

Install speed directly affects how many jobs you can complete per day — and that's as important as margin per job.

C9 wins on roofline speed. Fewer bulbs per foot, clips go up fast, and the wire is stiff enough to handle easily on a ladder. A 100-foot roofline with C9 LED can realistically go up in 45–60 minutes once clips are in place, for an experienced installer.

C7 is marginally slower per foot because the bulbs are smaller and the wire is lighter (more prone to tangling in wind). Not a dealbreaker — just factor it into your labor estimate.

Mini lights are the most time-intensive per dollar of product. Wrapping a large shrub well takes longer than customers expect, and unprofessional shrub wraps are one of the most common reasons customers don't re-book. If you're doing high-volume residential, route your mini light jobs together to cut drive time. The principles in Holiday Lighting Route Scheduling Tips: How to Complete More Installs Per Day apply directly here.

What about removal and storage — does bulb type affect that revenue stream?

Yes, and it's often overlooked. C9 and C7 strands that you own and rent to customers (rather than sell) become recurring revenue every season. A contractor-owned strand you store in your warehouse can go back on the same house for 5–8 seasons if handled correctly. That changes the math on inventory investment dramatically.

Mini lights are more disposable — they tangle and degrade faster in storage. They're generally better sold outright or replaced annually.

For how to price the back half of the season, see What to Charge for Holiday Light Removal and Storage Services.

What should your starting inventory actually look like?

For a solo operator launching or restructuring inventory, here's a practical starting point:

• C9 LED strands (25-ft, warm white + multicolor): 30–50 strands
• C7 LED strands (25-ft, warm white): 20–30 strands
• LED mini lights (50-count, warm white): 40–60 strands
• Replacement C9 and C7 bulbs: 100–200 loose bulbs each format
• Gutter clips, extension cords, and timers: sized to your strand count

Source from a wholesale holiday lighting supplier — general electrical distributors often charge retail-adjacent prices on seasonal product. The Christmas Designers and similar wholesale platforms are worth comparing for contractor accounts.

Frequently asked questions

Q: Should I stock warm white or multicolor bulbs?

A: Stock primarily warm white — it's what the majority of residential customers request for a clean, traditional look. Keep a smaller stock of multicolor in C9 and mini lights for customers who ask. A rough 70/30 warm-to-color split works for most markets.

Q: Can I mix C7 and C9 bulbs on the same job?

A: Yes, and it's common. C9 on the roofline and C7 on mid-height features like columns or windows is a clean combination. Just don't mix them on the same continuous run — the spacing and wire gauge differ.

Q: How many linear feet of C9 should I stock per job?

A: A typical single-family residential roofline runs 150–250 linear feet. Stock to cover your average job count for the week, plus one full job as buffer. Running out mid-install on a Saturday is expensive in both time and reputation.

Q: Are LED mini lights worth the higher upfront cost versus incandescent?

A: For contractor use, yes. LED mini lights run cooler, last longer, and fail less frequently mid-season, which reduces callbacks and protects your schedule during your busiest weeks.

Q: Should new contractors buy or rent bulbs to customers?

A: Selling bulbs outright is simpler to start. Once you have consistent repeat customers, shifting to a contractor-owned rental model improves long-term margin — you control the product quality and the customer stays with you season over season.

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