Welcome to the confusing world of lamp bases! The following key will help you understand the codes of the various bases. If you need further assistance, please do not hesitate calling:
| Code | Description |
| BA15s | Candelabra Bayonet Single Contact |
| BA15d | Candelabra Bayonet Double Contact |
| E10/12 | Miniature Screw |
| E11 | Minican Screw |
| E12/15 | Candelabra Screw |
| E17/20 | Intermediate Screw |
| E26/24 (E26s) | Medium Screw S.C. |
| E26d | Medium Screw D.C. |
| E39 | Mogul Screw |
| Fa8 | Single Pin |
| G2.4 | Two Pin, 2.4mm pin spacing |
| G3.18 | Two Pin, 3.18mm pin spacing |
| G3.9 | |
| G4 | |
| GZ4 | |
| G4.5 | |
| G5.3 | Miniature Two Pin |
| GX5.3 | Two Pin, Low Voltage |
| GY5.3 | Two Pin, Flat Pin |
| G6.35 | Glass Two Pin |
| GX6.35 | |
| GY6.35 | Glass Two Pin |
| GZ6.35 | |
| G7.9 | Side Pin |
| GX7.9 | Side Pin, Low Voltage |
| G9.5 | Medium Two Pin |
| GX9.5 | |
| GY9.5 | Prefocus Two Pin (Higher Wattage) |
| GZ9.5 | Prefocus Two Pin |
| G13 | Medium Bi Pin |
| GX13D | Extended Mogul End Prong |
| G17T | Tri Pin Prefocus |
| GY16 | |
| G17q | Four Pin Prefocus |
| G17t | Three Pin Prefocus |
| GX17q | Four Pin Prefocus, Low Voltage |
| G20 | Mogul Bi Pin |
| G21 | |
| G22 | Medium Bi Post |
| G38 | Mogul Bi Post |
| P28S | Medium Prefocus |
| P30S | Candelabra Single Contact Prefocus |
| P30D | Candelabra Double Contact Prefocus |
| P40S | Mogul Prefocus |
| R7S | Recessed Single Contact |
| RX7S | Recessed Single Contact |
| R17d | Recessed D.C. |
| Wedge | |
| Special A | Miniature 3 Pin |
| Special B | DC Medium Ring |
| Special C | G17 Special Connection |
| Special D | Small Indexing Ring |
| Special E | Large Indexing Ring |
| Special F | Locking 4 Pin |
| Special G | Screw Terminals |
| Special H | 2 Button |
| Special I | Two Pin Plug |
| Special J | Ferrule Contact |
| Special K | Special Cable Leads |
