The diameter of a lamp is measured in eighths of an inch and expressed as a “T” number, such as T8 (equals 8/8’s or one inch) and T12 (equals 12/8’s or an inch and a half diameter).
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The diameter of a lamp is measured in eighths of an inch and expressed as a “T” number, such as T8 (equals 8/8’s or one inch) and T12 (equals 12/8’s or an inch and a half diameter).