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General Technical Information
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The technical information presented
in this catalog is intended to provide
basic fundamentals of lighting technology
and terminology. In addition, there
are a variety of references pertaining
specifically to the lamp types that
appear in the catalog, such as bulb
types, filament configurations, part
number suffixes and rated life data.
Lamp Number
All lamps are identified by a standard
industry number indicating physical
and electrical characteristics, design
voltage, current, mean spherical candela
(MSCD) or end foot candles (EFC) (whichever
is applicable), filament configuration,
rated life, and primary applications.
The number is sometimes followed by
a suffix denoting material and/or color
characteristics.
Physical
Characteristics
Bulb Type
Bulb shape is indicated by one of
the following letters:
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| B |
Blister |
RP |
Reflector
Parabolic |
G
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Globular |
S
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Straight-side |
| PAR |
Parabolic Aluminized
Reflector |
T |
Tubular |
| R |
Reflector |
TL
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Tubular, Lens end |
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| Attributive
Suffixes |
The suffixes
below denote material and/or color:
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| A |
Amber-coated |
K |
Krypton-filled |
| F |
Frosted |
NA |
Natural amber |
| H |
Halogen-filled |
NI |
Nickel-plated base |
| IF |
Inside frosted |
Q |
Quartz-filled |
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Light
Center Length (LCL)
LCL is measured from the geometric center
of the lighted filament to that part
of the base listed below: |
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Double Contact (D.C.)
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Bayonet Top of base
pin
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Double Contact Index
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Top of lower base pin
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Midget Bi-Pin Base
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Flat bottom of base
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Midget Grooved Base
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Center of groove
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Midget Flanged Base
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Top of the flange
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Miniature Bayonet
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Top of base pin
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Screw Bases
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Bottom of end contact
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Single Contact (S.C.)
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Bayonet Top of base pin
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Single Contact Midget Flanged
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Top of flange
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Single Contact Miniature Flanged
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Top of bosses in flange
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Single Contact or Double
Contact Prefocus
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Bottom of indentations on
prefocusing collar
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Wedge Base
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Center of notch
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Filament Configurations
These are identified by the letters
below and a suffix number (or number
and letter) indicating the shape of
the filament and the number of any supports.
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| S |
Straight |
| C |
Coiled Wire |
| CC |
Coiled Coil |
Click here to view filament
configurations. |
Electrical
Characteristics
Design Volts
The socket voltage for which
the lamp was originally designed
and at which the following characteristics
are measured:
Design Amps
The approximate current which
the lamp will draw at design
volts.
Watts
The approximate power the lamps
will consume at design volts.
Watts = Amps x Volts
Mean Spherical
Candela (MSCD)
The average value of the luminous
intensity of a light source
in all directions. To convert
MSCD to Lumens, multiply by
4pi (12.57).
Approximate
Initial Peak Beam Candlepower
(AIPBC)
The initial peak beam candlepower
of a sealed beam lamp is the
amount of light at the point
of highest intensity in the
beam (historically known as
the approximate initial maximum
beam candlepower).
End Foot
Candles (EFC)
A measure of that portion of
the total light output of a
T-2 lamp that passes through
a .250" orifice placed
at the end of the lamp.
Rated Life
The rated average laboratory
life to be expected operating
the lamps on stationary racks,
energized with regulated D.C.
voltage. Actual service life
will vary with application.
In incandescent lamps, the filament
resistance, temperature, current,
watts, light output, and life
are all greatly affected by
the voltage. Empirical equations
are available, relating those
parameters to voltage over ranges
of as much as 10% from nominal
voltage. The designer may improve
one parameter by changing the
voltage, but in doing so shifts
all the other parameters. For
example, the life varies so
that a small decrease in voltage
will greatly extend the life;
but the light output will simultaneously
decrease as the fourth power
of that voltage. The nomograph
and curve diagrams below show
the interrelationships of current,
candlepower, and operating life
to voltage.
All life
data presented in the catalog
are given as B50
@ 14.0 volts for halogen products
and at bulb rated voltage for
all others unless noted.
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Click here for more information on
lamp life measurements.
Fig.1 Click on graph to enlarge.
Fig.2
Click on graph to enlarge.
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