Getting a crisp holiday display isn’t about using the most lights. It’s about using the right spacing to match your display. This guide explains the most common spacing options, what they look like, and when to use each one.
When to use each spacing (and why)
So you’ve picked your bulb style, likely a C9 Bulb or a G30 Bulb. Now choose the density that matches your look, budget, and schedule.
6" spacing
The densest spacing option and, in most cases, too dense for typical installations
Creates bold, attention‑grabbing lines and very bright sparkle
Best for highly decorative looks where the lights themselves are the star
12" spacing
The industry standard
One bulb per foot makes planning and estimating simple
Strong visual punch without overloading circuits or timelines
Delivers a balanced, dazzling roofline
15" spacing
Great for large tree wraps
Looks similar to 12" at a glance, especially from street distance
36" spacing
A low‑density choice for ambiance
Perfect for large tree wraps with a randomized sparkle
Not recommended for high‑visibility rooflines
How to decide which length of socket power cord or socket spool to purchase
After deciding on your bulb type and spacing, make sure you’re purchasing the right lengths of socket wire for your installation.
Available options
E17 Socket Power Cord
25 ft pre‑plugged cord
100 ft pre‑plugged cord
500 ft E17 spool for larger installations (comes without plugs)
E12 Socket Power Cord
25 ft pre‑plugged cord
100 ft pre‑plugged cord
500 ft E12 spool (comes without plugs)
When to choose a 500 ft spool
If you’re a professional installer planning multiple installations, a 500 ft spool is a cost‑effective option and helps prevent waste because the wire can be cut to longer lengths.
500 ft spools do not have pre‑attached plugs and are designed to be custom cut to length.
Home and business owners should consider purchasing a 500 ft spool when they know their installation will be 450 ft or longer.
Remember to purchase either pairs or packs of zip plugs.
The maximum run of socket wire is 250 ft, so plan to cut the 500 ft spool into runs of 250 ft or less.
When to choose pre‑plugged cords
Single installations under 450 ft
100 ft power cords are a great option. Since they come with plugs pre‑attached, plugging two or more cords together for a roofline installation is a great option.
Shorter installations
25 ft cords can also be plugged together. For example, if you need 50 ft of socket power cord, purchase two 25 ft cords and plug them together.
You can also mix and match 100 ft and 25 ft cords if you just need a little extra length.
The 200 ft Roofline Bundles are a great way to conveniently purchase everything you need for a roofline installation. If you find yourself needing less, use the 200 ft bundle as a guide for building your cart, and consider halving the quantities for a 100 ft installation.
Custom cutting and terminations
All types of E12 and E17 socket power cord can be custom cut to length, using SPT‑2 zip plugs to create custom wire terminations.
Connecting to distant outlets
Use an SPT-2 based power cord or extension cable to connect your roofline lights to an outlet if the outlet is far away from the start of your lights.