You have found the perfect light, and now the details on the box say E14 or G9. Here is a clear guide to the most common bulb fittings, so you always buy the right bulb first time.
E27: the standard screw fitting
E27, also called ES (Edison Screw), has a 27 mm screw base. It is the most common fitting for pendants and ceiling lights and offers the widest choice of bulbs, from classic shapes to decorative filament bulbs.
E14: the small screw fitting
E14, or SES (Small Edison Screw), has a 14 mm screw base. It is typically used for candle bulbs in chandeliers and for smaller wall lights.
G9: the compact pin capsule
G9 bulbs are small capsules with two looped pins that push straight in. Their compact size makes them ideal for crystal chandeliers and sculptural designs where the bulb needs to stay discreet.
GU10: the twist-lock spot
GU10 bulbs have two short, thick pins. You push them in and twist to lock. They are common in spotlights, downlights and some wall sconces.
An important note for UK homes: B22 bayonet
Many UK homes use B22 bayonet bulbs, which push in and twist with two side pins. A B22 bulb will not fit an E27 screw fitting, even though they look similar in size. Always check the fitting listed on the product page before buying bulbs.
| Fitting | How it fits | Typical use |
|---|---|---|
| E27 (ES) | 27 mm screw | Pendants, ceiling lights |
| E14 (SES) | 14 mm screw | Chandeliers, wall lights |
| G9 | Two looped pins, push in | Crystal chandeliers, compact designs |
| GU10 | Two pins, push and twist | Spotlights, sconces |
| B22 | Bayonet, push and twist | Traditional UK fittings |
Integrated LED: no bulb at all
Many modern designs use integrated LEDs built into the light itself. There is nothing to buy or replace, and the light can follow sculptural shapes that a bulb never could.
Dimming
If you want to dim a light, you need both a dimmable bulb and a compatible dimmer switch. Not every LED bulb is dimmable, so check the packaging.
The essentials
Check the fitting on the product page before buying bulbs, remember that B22 bayonet bulbs do not fit E27 lights, and choose a warm white LED bulb for the cosiest result.
