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Light Bulbs At A Glance
The Guide below will explain quickly everything you need to know about light bulbs.
Bulb Shapes
Base Types
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B = Bayonet Style Bases: |
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*DC = Double Contact |
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*SC = Single Contact |
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Base Code |
Diameter |
Description |
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B7s |
7mm |
SC Bayonet with small ridges on the sides |
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B9s |
9mm |
Miniature SC Bayonet |
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BA15d |
15mm |
DC Bayonet |
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BA15s |
15mm |
SC Bayonet |
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BAY15d |
15mm |
DC Indexed Bayonet |
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BA20s |
20mm |
Flange-style SC Bayonet |
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BA20d |
20mm |
Flange-style DC Bayonet |
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B21s |
21mm |
4-knob SC Bayonet |
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B22d |
22mm |
DC Bayonet |
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*Measured outside edge to outside edge on the threaded area |
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Base Code |
Diameter |
Description |
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E5 |
5mm |
Midget Screw |
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E10 |
10mm |
Miniature Screw |
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E11 |
11mm |
Miniature Candelabra Screw |
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E12 |
12mm |
Candelabra Screw |
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E14 |
14mm |
European Intermediate Screw |
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E17 |
17mm |
Intermediate Screw |
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E26 |
26mm |
Medium Screw |
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E27 |
27mm |
European Medium Screw |
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E29 |
29mm |
Admedium Screw |
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E39 |
39mm |
Mogul Screw |
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E40 |
70mm |
European Mogul Screw |
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*Pin Spread is measured from the center of one pin to the center of the other |
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Base Code |
Pin Spread |
Description |
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G4 |
4mm |
2 Pins, .7mm pin diameter, flattened glass base |
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GU4 |
4mm |
2 Pins, .7mm pin diameter, pins from rectangular back with grooves on MR11 |
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GX4 |
4mm |
2 Pins, .7mm pin diameter, pins from round back on MR11 |
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GZ4 |
4mm |
2 Pins, 1.0mm pin diameter, pins from rectangular back on MR11 |
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G5.3 |
5.3mm |
Ceramic block 2-Pin, 1.56 mm pin diameter |
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GU5.3 |
5.3mm |
2 Pins, .7mm pin diameter, pins from rectangular back with grooves on MR16 |
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GX5.3 |
5.3mm |
2 Round Pins, for Low Volt lamps, 1.53 pin diameter |
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GY5.3 |
5.3mm |
2 Flat Pins, for Line Volt (120V) or High Volt (such as 82 volts) lamps |
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G5.3-4.8 |
5.3mm |
2 Flat Blades that are 4.8mm wide x .5mm thick |
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G6.35 |
6.35mm |
2 Pins, 1.0mm diam pins, flattened glass |
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G6.35-13 |
6.35mm |
2 Pins, 1.0mm diam pins, 13mm width flattened glass |
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G6.35-15 |
6.35mm |
2 Pins, 1.0mm diam pins, 15mm width flattened glass |
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G6.35-20 |
6.35mm |
2 Pins, 1.0mm diam pins, 20mm width flattened glass |
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G6.35 Ceramic |
6.35mm |
2 Pins, Ceramic Seal Cover, 1.0mm diam pins, small ceramic cover over flat glass |
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G6.35/15x19 |
6.35mm |
2 Pins, 1.6mm pin diameter, 15mm x 19mm ceramic block |
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G6.35/19x19 |
6.35mm |
2 Pins, 1.6mm pin diameter, 19mm x 19mm ceramic block |
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GY6.35 |
6.35mm |
2 pins, 1.25mm diam pins, flattened glass |
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GY6.35-13 |
6.35mm |
2 Pins, 1.25mm diam pins, 13mm width flattened glass |
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GY6.35-15 |
6.35mm |
2 Pins, 1.25mm diam pins, 15mm width flattened glass |
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GZ6.35 |
6.35mm |
2 Pins, 1.00mm diam pins, from back of MR16 lamp |
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Base Code |
Diameter |
Description |
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P28s |
28mm |
Medium Prefocus, 2 different-sized flanges, single contact |
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P30s |
30mm |
Candelabra Prefocus base, single contact, circular flange w/ 3 slots |
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P30d |
30mm |
Candelabra Prefocus base, double contact, circular flange w/ 3 slots |
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P35s |
35mm |
Prefocus base, flange with 4 square blades, see our catalog p. 18 for diagram |
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P40s |
40mm |
Mogul Prefocus base, 2 same-sized flanges, single contact |
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P46s |
46mm |
Bell & Howell Small Indexing Ring, flange in complete circle |
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P46L |
46mm |
Bell & Howell Large Indexing Ring |
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Base Code |
Diameter |
Description |
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R7s |
7mm |
Recessed Single Contact, ceramic ends w/bowl-shaped contact inside each end |
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R7s-12 |
7mm-12mm |
Recessed Single Contact, 7mm ceramic ends w/bowl-shaped contact inside each end with flattened glass 12mm wide |
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R7s-15 |
7mm-15mm |
same as R7s-12 except flattened glass 15mm wide |
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R7s-18 |
7mm-18mm |
same as R7s-12 except flattened glass 18mm wide |
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R7s-21 |
7mm-21mm |
same as R7s-12 except flattened glass 21mm wide |
