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LINEAR FLUORESCENT LAMPS
68
PHOSPHOR
Coating inside the lamp transforms
ultraviolet radiation into visible
light. Color of light produced
depends on composition
of phosphor.
LAMP
Usually straight
glass tube. May
also be circular
or U-shaped.
BASE
Several di erent types used
to connect the lamp to the
electric circuit and to support
the lamp in the lampholder.
MERCURY
A minute quantity of
mercury is placed in
the lamp to furnish
mercury vapor.
GAS
Usually argon or a
mixture of inert gasses
at low pressure.
STEM PRESS
The lead-in wires have an air
tight seal here and are made of
Dumet wire to assure about the same
coecient of expansion as the glass.
LEAD-IN WIRES
Connect to the base pins
and carry the current to
and from the cathodes
and the mercury arc.
CATHODE
“Hot cathodes” at each end
of lamp are coated with
emissive materials which
emit electrons. Usually made
of coiled-coil or single-coil
tungsten wire.
EXHAUST TUBE
Air is exhausted through this
tube during manufacture
and inert gas introduced
into the lamp.
CATHODE GUARD
For maximum lumen maintenance,
a “cathode guard” surrounds each
electrode to e ectively reduce lamp
darkening and retain a clean
appearance for thousands
of hours.
FLUORESCENT LAMP COMPONENTS
Mini BiPin
Medium BiPin
Single Pin
Recessed D.C.
4-Pin
GU10q
FLUORESCENT LAMP BASE TYPES
FLUORESCENT LAMP SHAPES
T5 Shape T8 Shape
T12 Shape
U-Bent Shape T6 2C Circular Shape
T9 CircularShape