WHAT DO ALL THESE NUMBERS MEAN?

Quickly learn these industry standard terms you never knew you’d need to know when buying Christmas lights.

Tru-Tone bulbs come in 3 sizes, each with a different base that fits a corresponding socket size
Tru-Tone C7 light bulb diagram

C7 Bulb > E12 Base

  • Smallest bulb, .5 Watts with E12 base (also called Candelabra).
  • Works with: Tru-Tone E12 Classic Light String, E12 Deluxe Light String, and Star Tree Top.
  • Sold in boxes of 25 or 5 bulbs (Classic Mix, Mod Mix, Single Color or Clear)

Tru-Tone C9 light bulb diagram

C9 Bulb > E17 Base

  • Larger bulb, .5 Watts with E17 base (also called Intermediate).
  • Works with: Tru-Tone E17 Classic Light String. (We do not currently sell a Deluxe Light String for these bulbs)
  • Sold in boxes of 25 or 5 bulbs (Classic Mix, Mod Mix, Single Color or Clear).

Tru-Tone S14 light bulb diagram

S14 Bulb > E26 Base

  • Our largest bulb, 1 Watt with E26 base (also called Medium base). (We do not currently sell any light strings for these bulbs)
  • Sold in boxes of 25 bulbs (Classic Mix) or boxes of 12 bulbs (Single Color only)


Tru-Tone vintage-style light strings come in 2 styles, Classic and Deluxe. All light strings operate at 110 V, have 25 sockets, 12” spacing between sockets, 18″ leads, and can be connected end to end. Using Tru-Tone bulbs you can connect a nearly unreasonable number of them together on a single circuit. Using only Tru-Tone bulbs and light strings, you can safely connect up to 24 light strings (600 Tru-Tone bulbs!). At that length you may consider using standard bulk light string found elsewhere.

Tru-Tone Classic Light String with vintage-style wires

E12 Classic Light String – Two-Tone Green or Red and Green twisted pair vinyl wire with green clip sockets and brown plug. Works with all C7 bulbs.


E12 Deluxe Light String – Two-Tone Green or Red and Green twisted pair fabric covered wire with black sockets and black plug. Works with all C7 bulbs.


E17 Classic Light String – Two-Tone Green or Red and Green twisted pair vinyl wire with green clip sockets and brown plug. Works with all C9 bulbs.

Tru-Tone Deluxe Light String with vintage-style fabric-covered wires

For more information on ways to use Tru-Tone bulbs, see the Where Can I Use Tru-Tone Bulbs?