A21 light bulb (E26 base) — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/a21-light-bulb/  (CC BY 4.0)
Basis: Philips product datasheet (Philips 16A21/PER/830/P/E26/DIM)
Catalog version: 2026-10-20

Overall (mm): length 78, width 78, height 140
- A21: Ø78 mm, 140 mm maximum overall length, E26 base — figures from the Philips 16A21/PER/830/P/E26/DIM datasheet.
- The shape code gives the diameter in eighths of an inch (A21); the ANSI C78 envelope limits are paywalled, so a typical current product is quoted. Other brands differ by a few mm in length.
- The file is a cylinder envelope Ø × MOL (the bulb fits inside it).

dimension  value
diameter  78 mm (3.07 in)
max overall length  140 mm (5.51 in)
base  E26
reference product  Philips 16A21/PER/830/P/E26/DIM

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- Philips: Philips 16A21/PER/830/P/E26/DIM datasheet — web — Publisher's page; dimensions are facts — https://www.assets.lighting.philips.com/is/content/PhilipsLighting/fp929001836904-pss-en_us

Free files (CC BY 4.0, Xem Studio; STEP + STL, 1 parts): https://xemstudio.com/files/hardware/a21-light-bulb/index.json
API: https://xemstudio.com/api/geometry?object=a21-light-bulb