Lamp and Ballast Catalog - The Lighting Company

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BULBS
A bulb designation consists of a letter(s)
to indicate the shape and a
number(s) to indicate the approximate
maximum diameter in eighths of
an inch. Thus, an E17 lamp is an
Ellipsoidal shape and 17/8 of an inch
or 2 1/8 inches in diameter. Other letter
designations include: BT=Bulbous
Tubular; E or ED=Ellipsoidal;
ET=Ellipsoidal Tubular;
PAR=Parabolic; R=Reflector;
T=Tubular.
E17
ET18
ET23.5
E25
T J Base
ED37
BT28
BT37
T Ceramic
Spade
BT56
PAR20
PAR30 LN
PAR38
H
I
D
R30
R40
T
RSC base
T
G12 base
T
G8.5 base
T
Mogul base
T
BY22d base
BASES
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.
G8.5
G12
E26
E26
E39
E38
EX39
E26
BY 22 d
Ceramic
#8 - #10
Spade
J
RRSC
RSC
OPERATING POSITIONS
A designated operating positions
assure maximum lamp performance.
Where it is not specified, the lamp is
suitable for operation in any position.
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For more complete product information visit www.sylvania.com Symbols/Footnotes on page 101-102
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