Editing Fluorescent lamp (section)

==Lamp sizes and designations==
{{Main|Fluorescent lamp formats}}
Systematic nomenclature identifies mass-market lamps as to general shape, power rating, length, color, and other electrical and illuminating characteristics.

In the United States and Canada, lamps are typically identified by a code such as FxxTy, where F is for fluorescent, the first number (xx) indicates either the power in watts or length in inches, the T indicates that the shape of the bulb is tubular, and the last number (y) is the diameter in eighths of an inch (sometimes in millimeters, rounded-up to the nearest millimeter). Typical diameters are T12 or T38 ({{frac|1|1|2}} inches or 38&nbsp;mm) for residential lamps, T8 or T26 (1 inch or 25&nbsp;mm) for commercial energy-saving lamps.