Light bulb glossary shopping for light bulbs can be confusing especially since one size no longer fits all.
What is a br20 light bulb.
Light bulbs have identifying characteristics that are represented by a letter or series of letters and a number.
These are known as light bulb codes.
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Here s a quick reference list to help you explore the types of bulbs available.
Learn more about bulb codes and browse a visual guide to find what fits your fixture.
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Knowing this the formula is 1 8 th of an inch multiplied by the number shown after the bulb s category.
Br30 1 8 x 30 3 3 4 inches.
These codes tell you if a bulb will fit in your fixture and if it s the right shape.
The r in br and r bulbs stands for reflector which is the mirror like coating found on the inside of the incandescent and halogen versions of this type of bulb that helps boost the light output.
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The designation 20 on a light bulb indicates the size of the bulb.
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The characteristics of r20 and br20 bulbs.
Incandescent bulbs are the traditional bulb likely what you think of when someone says light bulb.
The base unit of any light bulb is 1 8 th of an inch.
This means that r20 and par20 bulbs are the same size.
More options available.
Br40 1 8 x 40 5 inches.
Br20 1 8 x 20 2 5 inches.
Light bulbs are measured in eighths of an inch so a bulb designated as a size 20 measures 20 eighths of an inch or 2 1 2 inches across at the largest point.
They have a filament inside of them that heats and.