Understanding LED light bulb base types is essential for anyone looking to upgrade their home or office lighting. These bases come in various shapes and sizes, including common types like E26, E27, GU10, and B22, each designed for specific fixtures and purposes. Choosing the right base not only ensures compatibility but also optimizes performance and energy efficiency. With the growing popularity of LED technology, familiarizing yourself with these base types can lead to smarter lighting decisions, enhancing ambiance while saving on energy costs. Dive into the world of LED light bulbs and discover how the right base can illuminate your space perfectly!
| Category | Base Type | Typical Use | Description | Size (mm) | Region |
| Screw Base | E10 | Indicator lights, flashlights | Miniature screw base, used for tiny fixtures and indicators | 10 | Global |
| Screw Base | E11 | Small fixtures and appliances | Mini candelabra base for small fixtures | 11 | North America, Asia |
| Screw Base | E12 | Chandeliers, night lights | Candelabra screw base for decorative lighting | 12 | North America |
| Screw Base | E14 | European lamps and appliances | Small Edison screw base, European standard | 14 | Europe |
| Screw Base | E17 | Ceiling fans, desk lamps | Intermediate screw base for appliances | 17 | North America, Japan |
| Screw Base | E26 | Standard North American household bulbs | Medium screw base, most common in North America | 26 | North America |
| Screw Base | E27 | Standard European household bulbs | Medium screw base, common in Europe | 27 | Europe |
| Screw Base | E39 | Streetlights, industrial lighting | Mogul base for high-wattage industrial lighting | 39 | North America, Industrial |
| Bi-Pin | G4 | Under-cabinet, desk lamps | 2-pin base with 4mm spacing, compact fixtures | 4 | Global |
| Bi-Pin | G5 | T5 fluorescent tubes | 2-pin base with 5mm spacing, linear tubes | 5 | Global |
| Bi-Pin | G6.35 | Stage and studio lighting | 2-pin base with 6.35mm spacing for high-intensity lights | 6.35 | Global |
| Bi-Pin | G8 | Pendant lights, under-cabinet | 2-pin base for small, low-profile fixtures | 8 | Global |
| Bi-Pin | G9 | Decorative fixtures, chandeliers | Looped bi-pin base for capsule bulbs | 9 | Europe, Global |
| Bi-Pin | GU5.3 | Recessed and track lighting | 2-pin base with 5.3mm spacing, MR16 bulbs | 5.3 | Global |
| Bi-Pin | GU10 | Spotlights, downlights | Twist-lock 2-pin base for spotlights | 10 | Global |
| Bi-Pin | GU24 | Energy-efficient fixtures | Twist-lock base for energy-saving bulbs | 24 | North America |
| Bayonet | BA15s | Automotive, marine lighting | Single contact bayonet for automotive bulbs | 15 | Automotive (Global) |
| Bayonet | BA15d | Automotive, industrial lighting | Double contact bayonet for dual-filament bulbs | 15 | Automotive (Global) |
| Bayonet | B22 | Household lighting in UK, Australia | Bayonet cap standard in UK and Australia | 22 | UK, Australia, India |
| Specialty | R7S | Floodlights, security lighting | Linear base for double-ended halogen bulbs | 78 | Global |
| Specialty | GX53 | Under-cabinet, display lighting | Flat twist-lock base for low-profile fixtures | 53 | Europe, Asia |
| Specialty | GY6.35 | Stage and display lighting | Bi-pin base with 6.35mm spacing, halogen replacements | 6.35 | Global |
| Specialty | G13 | T8 and T12 fluorescent tubes | Bi-pin base for T8 and T12 tube lights | 13 | Global |
| Specialty | 2G11 | Compact fluorescent lamps | 4-pin base for CFL tube lights | 11 | Europe, Asia |
| Specialty | 2G7 | Compact fluorescent lamps | 4-pin base for compact fluorescent tubes | 7 | Europe, Asia |
| Screw Base | E5 | Miniature indicators, model railways | Tiny Edison screw base for micro-bulbs | 5 | Europe, Asia |
| Screw Base | E40 | Industrial and street lighting | Large mogul screw base for high-wattage fixtures | 40 | North America, Europe |
| Bayonet | B15d | Small decorative and automotive fixtures | Bayonet base with double contact for low-watt bulbs | 15 | Europe |
| Bayonet | B22d | Dual-contact version for UK lighting | Double-contact bayonet cap for higher stability | 22 | Europe |
| Bi-Pin | GU4 | Miniature reflector bulbs (MR11) | Mini twist-lock 2-pin base for small fixtures | 4 | Global |
| Specialty | G24d | CFL base, 2-pin | 2-pin CFL base with starter in lamp | 24 | Europe, Asia |
| Specialty | G24q | CFL base, 4-pin | 4-pin CFL base for electronic ballasts | 24 | Europe, Asia |
| Specialty | GX24q | CFL base with locking mechanism | 4-pin CFL base with keyed lock design | 24 | Europe, Asia |
| Specialty | R7s | Linear halogen tubes | Double-ended linear base for halogen tubes | 78 | Global |