E14 E27 light bulbs

Start with the socket, not the wattage: E14 screws into compact fixtures, E27 into most ceiling lights, pendants and table lamps. Note the maximum wattage engraved on the fixture, then choose the colour temperature for the room. This guide covers the two most common threads and the key points for replacing a bulb without getting it wrong.

What is the difference between an E27 and an E14 bulb?

The number in the name gives the thread diameter: E14 is a small 14 mm cap, E27 a large 27 mm cap. It is the shape of the socket that changes, not the mains voltage. A fixture takes one or the other, never both without an adapter.

E14 and E27 bulbs: the cap diameter

The E comes from the German Edison, and the number that follows gives the thread width in millimetres. It has nothing to do with consumption or brightness: an E14 bulb can light as much as an E27 if the fixture allows it. The cap only determines the mechanical compatibility with the socket.

How to identify a bulb cap without tools

Unscrew the bulb in place and compare: a thread as wide as a thumb is E27; a fine thread, barely wider than a pencil, is E14. Without a reference bulb, read the fixture label or the socket itself, where the format is often moulded. If in doubt, measure the thread with a ruler. Other formats exist, such as G9 or GU10, and can be found among the other caps such as G4 or G9.

For a large living room fixture, look at the E27 large cap bulbs; for a wall light or bedside lamp, the E14 small cap bulbs.

What is an E14 bulb?

An E14 bulb is a bulb with a small 14 mm thread, intended for compact fixtures: wall lights, bedside lamps, small pendants, accent lights. It comes in LED or filament versions, in clear or frosted glass. Check the maximum wattage stated on the fixture before replacing it.

E14 bulb: which fixtures it fits

The small cap is used on everything that needs to stay discreet: a hallway wall light, a bedside lamp, a small pendant above a side table, an accent lamp on a shelf. Its reduced size lets less heat through to the shade, which matters on short-socket models. It is the format found among bedroom bulbs, where a low, enveloping light is often sought.

E14 lamp: which light to choose

The result depends on the glass and the type. Frosted glass diffuses the light and reduces glare: comfortable near a bed. Clear glass directs the flux and shows the filament: interesting in an open fixture, less so in a bedside lamp. Glass bulbs come in both finishes, in LED as well as filament.

How do you choose a bulb for the room and the fixture?

To choose, start from the socket: E14 for small fixtures, E27 for living rooms. Then look at the maximum wattage the fixture accepts, then the desired effect. A warm light suits the living room and bedroom, a more neutral light suits workspaces.

Identifying the cap, the wattage and the useful flux

Three pieces of information to note before buying: the socket format, the maximum wattage engraved on the fixture or its label, and the lumen flux suited to the surface. Lumens measure the light emitted, watts the consumption. A flux of one thousand lumens gives a strong light, useful for a living room or a workspace; a more moderate flux is enough for ambience. The feel also depends on how the shade diffuses light.

Colour temperature: living room, bedroom, kitchen

Generally, 2700K gives a warm light and 3000K a more neutral result. The living room and bedroom call for warm light, listed among the living room bulbs; a kitchen or office can take a more neutral tone. In the same room, keep a single temperature to avoid visible differences from one fixture to another. Compare the 2700K results and the 3000K light before deciding.

Between affordable models and an exceptional piece, the difference lies in the glass material, the fineness of the filament, the shape of the bulb and the consistency of diffusion, more than in the cap. The bulb range groups these variants by format and by effect.

To do now: note the cap and maximum wattage of your fixture, then choose the colour temperature. The catalogue shows today's price on each reference.

How do you convert an E14 socket to E27?

A cap adapter screws into the existing socket and takes the bulb of the other format: E14 to E27 or the reverse. It is a temporary fix, but it adds length and remains limited by the maximum wattage of the fixture. Check that the bulb fits under the shade once mounted.

E14 E27 bulb adapter: how it is fitted

Switch off the power, unscrew the bulb, screw the adapter into the socket then the bulb into the adapter. Tighten without forcing: the weight of the bulb now rests on two threads instead of one. Check that the assembly stays straight and that no contact touches the metal frame of the fixture.

When the adapter is not the right solution

In a closed fixture, the added length may prevent the shade from going back on or bring the bulb closer to a heat-sensitive surface. On a pendant where the bulb stays visible, the adapter shows. For daily use, it is better to choose the right format from the start in the bulb range, or to change the fixture.

Outdoor E27 bulb: what should you check?

For outdoors, do not look only at the E27 cap: check the protection rating of the fixture and the socket, the exposure to rain and the glass material. A standard bulb is fine in a sheltered, sealed fixture. In an exposed area, you need an outdoor fixture designed for humidity.

Outdoor bulb: which IP protection rating

The IP rating is read in two digits: the first concerns solids, the second water. Outdoors, a fixture sheltered under an awning is fine with a moderate rating; a wall light exposed to rain requires a higher rating. The rating belongs to the fixture, not the bulb: a standard bulb in an open fixture is still an indoor bulb.

Wiring an outdoor bulb: the point on sealing

The fixture gasket, the cable gland and the orientation of the socket provide the sealing. A socket facing down drains water better than a horizontal socket. Also check that the glass withstands frost. For these locations, prefer E27 LED bulbs fitted in a fixture designed for outdoors, and browse all our fixtures to find the right model.

Wiring 3 bulbs in parallel: how do you do it?

In parallel, the three sockets receive the same live and the same neutral: each bulb works independently and keeps the mains voltage. Switch off the power at the breaker, identify the wires, tighten the terminals and check the total wattage allowed by the switch and the cable.

Three sockets on one switch: the principle

The three sockets are fed from the same supply: the live is looped from terminal to terminal, the neutral follows the same path, the earth is connected if the fixture provides for it. Each bulb switches on and off with the others, but a blown bulb does not switch off the other two. Use suitable terminals and identify the conductors by their colour.

What changes compared with a series connection

In series, the voltage is shared and the light weakens: this arrangement has no place in domestic lighting. In parallel, each bulb receives the full voltage and can be swapped without cutting the circuit. Add up the wattage of the three bulbs and compare it with what the switch and cable can take. At the slightest doubt about the wiring, call an electrician.

What happens if you use a LED bulb that is too powerful?

Exceeding the maximum wattage engraved on the fixture heats the socket and can damage the shade or the support. LED heats less than a classic bulb, but it is not cold. The rule remains the maximum wattage stated by the fixture manufacturer, never that of the bulb.

LED bulb: the drawbacks to know

An LED dissipates its heat poorly in a closed volume, which shortens its life. Not all are compatible with a dimmer: some flicker or buzz. Light quality varies by model, especially the consistency of colour temperature and colour rendering. The bulb may also be longer than a classic bulb and hit a small shade.

Replacing a 40 watt bulb with a LED

Compare lumens, not watts: a LED consumes less for a flux comparable to a filament bulb. Note the maximum wattage of the fixture, then choose the flux suited to the room. Finally check the cap, the bulb length and dimmer compatibility. The LED range and the contemporary design models cover these uses.

How do you match bulbs, fixtures and dimmer?

In the same room, keep a single colour temperature: 2700K for a warm ambience, 3000K for a more neutral result. Pair glasses of the same finish and a consistent filament. For a dimmer, choose a bulb stated as compatible, otherwise it may flicker or buzz.

2700K or 3000K bulbs: which ambience

2700K leans yellow and suits relaxation rooms; 3000K stays warm but whiter, practical for a kitchen or a worktop. Two different temperatures in the same room create a visible break, especially on light walls. Also harmonise the glass finish: clear with clear, frosted with frosted.

Dimmable bulb: why some flicker

Flicker almost always comes from an incompatibility between the dimmer and the bulb, or from too low a load when a single bulb is connected to a dimmer intended for several. The solution lies in a bulb stated as compatible: see the E27 dimmable bulbs, the small dimmer-compatible caps, or a model with visible filament among the retro bulbs.

How do you order your E14 and E27 bulbs?

Your order is made by cap, then by light effect: E14 for small fixtures, E27 for the others, LED or filament depending on the ambience. Payment is secure, delivery tracked, returns are provided for and the Designix customer service answers if you are unsure about a model.

Go back to your notes: socket format, maximum wattage, colour temperature. All that remains is to choose the glass finish and the bulb type. If your fixture cap is neither E14 nor E27, other formats exist, such as G9 or GU10. If you hesitate about a reference, Designix customer service can confirm compatibility before purchase. To equip a whole room, complete with the fixture catalogue and the E27 LED bulbs.

Frequently asked questions about E14 and E27 bulbs