top of page


What Does 1/8" Have to do With Bulbs Anyway?
HOW DO I MEASURE MY LIGHT BULB?
​
Bulb sizing is very straightforward:
​
All bulbs are based on the diameter of the bulb at its widest point, measured in eighths of an inch (â…›”)
​
Some Examples:
​
The designation “T12” indicates a tubular bulb that measures 12 eighths of an inch (12/8”) in diameter (or 1-½” wide/around)
​
The designation “T8″ indicates a tubular bulb that measures 8 eights of an inch (8/8″) in diameter (or 1” wide/round)
​
The designation “T5″ indicates a tubular bulb that measures 5 eights of an inch (5/8”) in diameter
​
The designation “Par38″ indicates 38 eights of an inch (38/8″) in diameter (or 4.75” wide)
​
The designation “A19″ of the most common household bulb indicates 19 eights of an inch (19/8″) in diameter (2-3/8” wide)
bottom of page