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How is lamp diameter measured? How can I determine the diameter of the lamp from the lamp name or description?

April 26, 2017description determine diameter lamp measured

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How is lamp diameter measured? How can I determine the diameter of the lamp from the lamp name or description?

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The shape of a bulb is followed by its maximum diameter, expressed in eighths of an inch. For example, a R40 has a maximum diameter of 40 eighths of an inch which equals 5″. The chart below will help you to quickly make these conversions.