Most bulbs are measured in eighths of an inch, however decorative lighting globe-shaped (or G) bulbs are measured in millimeters. For example, an S14 would be a sign bulb shape and 14/8" (or 1.75") and our decorative lighting G40 bulbs are globe shape and 40 mm (or approximately 1.5").

Are light bulbs standard size?

An E26 is the most common base size used in the manufacturing of incandescent, CFL, LED, and halogen light bulbs. The “E” stands for Edison and “26” means the base diameter measures 26 millimeters across.

How do I know what size light bulb I need?

The light bulb size is determined by the maximum overall diameter (MOD) of the bulb's shell. It is represented in eighths of an inch (1/8"). It's also important to keep in mind the bulb's length (or height) that is defined as the maximum overall length (MOL) expressed in inches.