To choose an E27 bulb for a table lamp, check six things: socket type, maximum wattage, lumens, colour temperature, physical size and whether dimming is required. It is not enough for the bulb to screw into the socket: it must also fit inside the shade and produce the type of light you need.
What E27 means
E27 identifies an Edison screw socket with an approximate diameter of 27 millimetres. It is one of the most common formats in European domestic lighting.
E27 only describes the connection. It does not tell you the bulb's size, wattage, colour temperature, lumens or whether it is dimmable.
1. Respect the lamp's maximum wattage
The light fixture specification should state the maximum compatible wattage. Modern LED models often have relatively low limits because they can produce enough light with low energy consumption.
Do not install a bulb that exceeds the stated maximum. Many Valma Home table lamps use an E27 socket and specify a maximum of 8 W for LED bulbs, but always check the individual product page.
2. Choose lumens according to use
Lumens indicate the amount of light. A purely ambient lamp needs less than a lamp used for reading or working.
- Soft ambience: fewer lumens and a diffusing shade.
- General use: medium intensity.
- Reading: enough light on the book, correctly directed and without glare.
There is no universal figure because distance, shade shape and the other light in the room change the result. See how many lumens you need according to the room.
3. Choose the colour temperature
- 2000K: very amber and decorative.
- 2700K: warm and versatile for bedrooms and living rooms.
- 3000K: warm with a cleaner appearance.
- 4000K: neutral and more functional.
For a domestic table lamp, 2700K is often the easiest option to integrate. In a reading or work area, 3000K can provide slightly more definition without looking cold.
4. Check the size and shape
Two E27 bulbs can have very different shapes. Before buying, check:
- The maximum diameter that fits inside the shade.
- The available height.
- The distance between the bulb and the shade material.
- Whether the socket is centred or offset.
Common shapes include A60, globe, candle and tubular. A bulb that is too large can stick out, touch the shade or change how the light is distributed.
5. Opal, clear or filament
Opal bulb
The white finish diffuses light and reduces bright hotspots. It is usually a good choice when the bulb can be seen through the shade.
Clear bulb
It can create stronger reflections and shadows. It is useful when a decorative look is desired or the fixture leaves the bulb visible.
Filament bulb
It visually resembles traditional bulbs. It can be attractive, but check the lumens, light distribution and whether the filament remains visible through the shade.
6. Check whether it needs to be dimmable
A dimmable bulb only dims when the switch, module or dimmer is also compatible. A non-dimmable bulb connected to a dimmer can flicker or work incorrectly.
If the lamp has a conventional switch, you do not need to pay more for a dimmable bulb unless you plan to use it in another system later.
7. Consider CRI
A CRI of 80 or above is common for general use. CRI 90 or higher helps wood, textiles, food and skin tones look more natural. Read our guide to CRI and colour rendering.
Quick choice by use
| Use | Guidance |
|---|---|
| Ambient bedside lamp | 2700K, soft intensity, opal finish |
| Reading | 2700K–3000K, enough lumens and good glare control |
| Decorative living room | 2000K–2700K, depending on the atmosphere |
| Home desk | 3000K–4000K, high CRI if you work with colours |
Common mistakes
- Buying by watts instead of lumens.
- Not checking the maximum wattage.
- Choosing a bulb that does not fit inside the shade.
- Using a colour temperature that is too cold for the desired atmosphere.
- Confusing “dimmable” with “automatically dimmed”.
- Ignoring whether the bulb is opal or clear.
Frequently asked questions
Do all E27 bulbs work in every E27 lamp?
The screw fitting will be compatible, but wattage, size, shape and dimming requirements may not be.
Which is better, 6 W or 8 W?
It depends on lumens and the lamp's maximum wattage. Two bulbs with the same wattage can emit different amounts of light.
Which bulb gives the cosiest light?
A bulb between 2000K and 2700K, usually opal and with moderate intensity, often gives a warm result.
Can I use a smart bulb?
Yes, if it uses an E27 socket, fits physically, respects the maximum wattage and works correctly with the lamp's switch.
Browse our table lamps to compare designs for warm lighting and check the specifications of each model. For example, Akari and Rinkō use an E27 socket and support LED bulbs up to 8 W.