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Bulbs are typically identified by a code such as F##T##, where F is for fluorescent,
the first number indicates the power in watts (or strangely, length in inches
in very long bulbs), the T indicates that the shape of the lamp is tubular,
and the last number is diameter in eighths of an inch. Typical diameters are
T12 (1½" or 38 mm) for residential bulbs with old magnetic ballasts,
T8 (1" or 25 mm) for commercial energy-saving bulbs with electronic ballasts,
and T5 (5/8" or 16 mm) for very small bulbs which may even operate from
a battery-powered device.
High-output bulbs are brighter and draw more electrical current, have different ends on the pins so they cannot be used in the wrong fixture or with the wrong bulb, and are labeled F##T12HO, or F##T12VHO for very high output.U-shaped tubes are FB##T##, with the B meaning "bent". Most commonly, these have the same designations as linear tubes. Circular bulbs are FC##T#, with the diameter of the circle (not circumference or watts) being the first number, and the second number usually being 9 (29mm) for standard fixtures.
Color is usually indicated by WW for warm white, EW for enhanced (neutral) white, CW for cool white (the most common), and DW for the bluish daylight white. BL is often used for blacklight (commonly used in bug zappers), and BLB for the common blacklight-blue bulbs which are dark purple. Other non-standard designations apply for plant lights or grow lights.Odd lengths are usually added after the color. One example is an F25T12/CW/33, meaning 25 watts, 1.5" diameter, cool white, 33" or 84 cm long. Without the 33, it would be assumed that an F25T12 is the more-common 30" long.Compact fluorescents do not have such a designation system.
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