At a glance
Look and feel: Clear lens with U‑shaped LED filament for a vintage, candle‑like aesthetic
Lens material: Polycarbonate lens is highly durable and shatter‑resistant—unlike old glass incandescents—while keeping that traditional, vintage Christmas look
Incandescent look, LED efficiency: Designed to look like classic glass incandescents, but they’re LEDs—so you get the same vintage glow with far lower energy use and longer life
Socket/base: E17 (C9) retrofit bulb, screws into standard C9 cords and SPT‑2 socket wire
Warm White color temperature: 2200 K for extra‑warm ambiance
Use cases: Classic holiday looks, warm year‑round outlines, heritage and residential installs
Why choose C9 U‑Filament vs. standard C9 or G30
Warmer vibe: Filament look reads warmer and more vintage than faceted C9s
Visual quality: Clean, candle‑like glow that photographs well
Swap‑able and serviceable: Replace individual bulbs, mix colors, and refresh patterns easily
Pro durability advantages: UV‑stable lenses and corrosion‑resistant bases for long outdoor use
Compatibility
Works with: E17/C9 socket wire on SPT‑2 cord systems, common spacing options include 6", 12", 15", or 36"
Install basics
Plan the run on SPT‑2 E17 socket wire with your preferred spacing
Start power with a male zip plug, end or branch with female or inline plugs as needed
Screw bulbs hand‑tight and face them uniformly for a clean line
Use appropriate clips for gutters, shingles, or fascia for consistent aim and strain relief
Put runs on an outdoor‑rated timer for consistent on/off schedules