In everyday lighting, small screw bases are typically called:

• E12 (candelabra) – 12 mm diameter. Common in chandeliers, sconces, and ceiling fans.
• E17 (intermediate) – 17 mm diameter. Found in some ceiling fans and specialty fixtures.

You’ll also see small non-screw bases, like G4 bi‑pin used in compact T3 lamps. Many night-light style bulbs labeled “C7” also use an E12 candelabra base.

To confirm your base, check the code printed on the bulb or fixture (for example, “E12,” “E17,” or “E26”). The number refers to the base’s diameter in millimeters. Matching that code helps you pick a bulb that fits without forcing or over-tightening.

Plenty of fixtures use small screw bases, especially for decorative or space‑saving designs. You’ll commonly find:

• Chandeliers and sconces – often use E12 candelabra bases with candle shapes like B10.
• Ceiling fans – frequently use E12 candelabra or E17 intermediate with compact A15 bulbs.
• Decorative globes – smaller G16 globe bulbs often come with E12 bases.
• Night lights – C7 style typically uses an E12 candelabra base.

When choosing, match the base code first (E12 or E17), then select the bulb shape that fits your fixture, the brightness you want (look at lumens or wattage equivalence), and a color tone you prefer, such as soft white (warm) or daylight (cool). If you’re using a dimmer, look for bulbs labeled “dimmable.”

E26 and A19 describe different things. E26 is the base size—a 26 mm medium Edison screw commonly used in standard household sockets. A19 is the bulb shape and size (the familiar pear shape). In North America, many A19 bulbs have E26 bases, but they aren’t the same term.

• Base first: Match your fixture’s base (E26, E12, E17, etc.).
• Then shape/size: Choose A19, A15, B10, G16, and so on, based on fit and look.
• Check details: Confirm brightness, color (soft white vs. daylight), and dimmer compatibility.

Verifying both the base and the shape helps you avoid fit issues and get the look and light you want.

Two common screw bases smaller than the standard E26 medium base are:

• E17 (intermediate) – a bit smaller than E26, used in some ceiling fans and specialty lamps.
• E12 (candelabra) – smaller still, common in chandeliers, sconces, and night lights.

You may also encounter small non-screw bases like G4 bi‑pin in compact lamps.

1. Power off and remove the old bulb.
2. Read the etching on the bulb or fixture for a code (E12/E17/E26).
3. Measure the threads across the diameter if needed (in millimeters).

On Walmart.com, you can filter by base type to narrow options and choose pickup or delivery where available. Matching the base code is the most reliable way to ensure a proper fit.

They can, but both the bulb and the switch need to support dimming. Many E12 candelabra and E17 intermediate bulbs come in dimmable versions, while others are non‑dimmable.

• Check the packaging: Look for “dimmable.” If it isn’t stated, assume it’s not.
• Use an LED‑compatible dimmer: Traditional dimmers may cause flicker or limited dim range with LEDs.
• Don’t mix types: Combining dimmable and non‑dimmable bulbs can lead to inconsistent performance.
• Tune the setup: Some dimmers have a low‑end trim to reduce flicker.

If you notice humming or flicker, trying a different dimmer or a bulb labeled as dimmable may help, but results can vary by fixture and components.