An ST19 is 19 eighths of an inch, or 2-3/8", across, the same width as an A19 but taller. Feit and GE sell it as an Edison-style bulb. The ST19s listed here from both makers have the standard E26 base.
The filament shapes by code
Edison or vintage is a style, not a size. Feit sells its Edison bulbs in ST19 and ST21 shapes, and filament bulbs also come as T tubes and G globes. The number is the width in eighths of an inch.
| Code | Across | Length | Example |
|---|---|---|---|
| ST15 | 1-7/8" | 4.65" | Westinghouse 4.5ST15 |
| ST19 | 2-3/8" | 5.51" | GE Relax HD ST19 |
| ST20 | 2-1/2" | 5.43" | Westinghouse 6.5ST20 |
| T10 | 1-1/4" | 4.1" or 7.1" | Feit BPT1040/927CA/RP, T10L60CL927CAWF/2 |
| G25 | 3-1/8" | 4.52" | Westinghouse 5.5G25 |
Lengths from GE’s and Feit’s product pages and the maximum overall length in Westinghouse’s 2022 catalog. Bulbs with the same code differ.
ST19 or A19?
Both are 2-3/8" across by the code. The ST19 is the taller one: GE’s Relax HD ST19 is 5.51" long, against 4.33" for its 60 watt replacement A19. In a shade, a cage or a small pendant, check there’s room for the extra inch or so.
What to check on the box
- Lumens. The glass and filament change the light. Feit’s amber 60ST19, a 60 watt incandescent, gives 260 lumens, while its clear ST1960/CL/927CA/4 LED gives 800 on 8.8 watts and its ST19100/CL/LED/HDRP 1,400 on 15 watts.
- Closed fixtures. That 15 watt ST19100/CL/LED/HDRP isn’t rated for enclosed fixtures. Its 8.8 watt sibling is.
- Dimming. Look for the dimmable label. GE lists its Cync smart ST19 as dimmable with its app, where its other ST19s dim with a dimmer switch.
- Outdoors. Feit’s ST19 LEDs are rated for damp locations, such as under a porch roof. Its dusk-to-dawn ST19s are on outdoor light bulbs.
Where they’re used
Feit describes its Edison bulbs for exposed pendants, open shelving and anywhere the bulb is meant to be seen, and its 60ST19 for lanterns. It tags its short T10 for pendants. Which look you want is your choice. For G25 globes over a bathroom mirror, see vanity light bulbs.
Turn the light off and let the bulb cool before you take it out of a pendant or cage.
Another shape?
Bases and shapes