Bulb sizing is very straightforward and simple, it is based on the diameter of the bulb at its widest point, measured in eighths of an inch (⅛”). For example, the designation “T12” indicates a tubular bulb that is 12 eighths of an inch (12/8”) in diameter (or 1 ½”).

Do candle bulbs come in different sizes?

Their range of sizes and base types (including E27, E12, G5, and G13) make them suitable for a wide range of applications: Chandeliers.

What is the standard lamp bulb size?

For example, an “A19 bulb” means that that the bulb comes in a standard household shape and is 19/8 inches in size. A19 bulbs are the most common light bulb shape, so this is what you’ll see the most.