There is certain
nomenclature which is used while labelling tube lights.
The actual fluorescent
tubes are identified by several letters and numbers and will look something
So, the typical labeling
is of the form FSWWCCC-TDD (variations on this format are possible):
· F - Fluorescent
G means Germicidal
shortwave UV lamp.
· S - Style - no
letter indicates normal straight tube; C for Circline.
· WW - Nominal power
in Watts. 4, 5, 8, 12, 15, 20, 30, 40, etc.
· CCC -
BL/BLB=Black light, etc.
· T - Tubular
· DD - Diameter of
tube in of eighths of an inch. T8 is 1", T12 is 1.5", etc.
For the most common T12
(1.5 inch) tube, the wattage (except for newer energy saving types) is usually
5/6 of the length in inches. Thus, an F40-T12 tube is 48 inches long.
There are lamps (bulbs
and LED who are available in different sizes and ratings in the market. There
are most commonly used bulb sizes with Nomenclature starting with A and
thereafter its size. Most commonly used are A15, A17, A19, A20, A21, A23
. These all sizes are multiple of 1/8th of inch. In Houses most commonly used
size was of A19 having 100 W or 125 W rating.
Where A stands for
There are other models
designed according to shapes of bulbs are:-