| Incandescent
Bulb Types: A bulb designation
consists of a letter(s) to indicate the shape and a figure(s)
to indicate the approximate majoy diameter in eighths of
an inch. Bulbs are measured through their greatest diameter
in eighths of an inch. Thus, an F-15 bulb is a flame shape,
15/8 of an inch or 1 7/8 inches in diameter.
Filament Types: A filament designation
consists of a prefix letter to indicate whether the wire
is straight or coiled, and a number to indicate the arrangement
of the filament on the supports. Prefix letters include:
C (coiled) - wire is wound into a helical coil or it may
be deeply fluted; CC (coiled coil) - wire is wound into
a helical coil and this coiled wire again wound into a helical
coil.
Base Types: Typical screw base is shown.
One leadin wire is soldered to the center contact and the
other soldered or welded to the upper rim of the base shell.
Base shells are typically made of brass or aluminum. ANSI
designations are in parentheses.
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| Fluorescent
Bulb Types: The bulb shape and size of
a fluorescent lamp are expressed by means of a code consisting
of the letter "T" (which designates that the bulb is "tubular"
in shape) followed by a number which expreses the diameter
of the bulb in eighths of an inch. They vary in diameter
from T-2 (1/4 inch) to T-12 (1 1/2 inches). In nominal overall
length, fluorescent lamps range from 6 to 96 inches, which
is always measured from back of lampholder to back of lampholder.
For example, the actual overall length of the 40 watt rapid
start T-12, 48 inch lamp is 47 3/4 inches. Circline lamps,
which are circular, are available in four sizes: 6 1/2 inches,
8 inches, 12 inches and 16 inches outside diameter. There
are also U-shaped fluorescent types (curvalume) with T-8
and T-12 bulbs. The width of U shaped types are measured
for the distance between the ends. The overall length is
measured from the face of the bases to the outside of the
glass bend.
Base Types: For preheat and rapid start
fluorescents, four electrical contacts are required, two
at each end of the lamp. This is accomplished in the standard
line of lamps by the use of a miniature bipin for T-8 and
T-12 bulbs and mogul bipin for T-17 bulbs. In circline lamps,
the cathodes are connected to a four-pin base located between
the junction of the two ends of the lamp. High Output and
Very High Output lamps have recessed double ontact (RDC)
type bases. Slimline (Instant Start) lamps require pnly
two electrical contacts, one at each lamp end and have single
pin bases.
All compact fluorescent lamp bases shown have 2 or 4 pins.
The 2 pin lamps are designed for preheat operation, with
lamps having an internal starter. The 4 pin lamps are dimmable
and are designed for electronic ballast operation; these
lamps have no internal starter.
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| H.I.D. (High Intensity Discharge)
Bulb Types: A bulb desingation consits
of a letter(s) to indicate the approximate maximum diameter
in eighths of an inch. Thus, an ED17 is an Ellipsoidal Shape,
17/8 of an inch or 2 1/8 inches in diameter.
Base Types: Lamps with screw bases have
one lead-in wire soldered or welded to the center contact
and the other soldered or welded to the upper rim of the
base shell.
Bases with ceramic bodies have internal leads welded to
either silver plated contacts or external lead wires.
Base Types: Typical screw base is shown.
One leadin wire is soldered to the center contact and the
other soldered or welded to the upper rim of the base shell.
Base shells are typically made of brass or aluminum. ANSI
designations are in parentheses.
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