How to Choose the Right Light Bulb for Your Table Lamp

Quick answer

Start with the fitting: most table lamps in the UK use E27 or E14, and the bulb must match. For a typical bedside or living room lamp, choose a warm white LED (around 2700K) with a lumen output of roughly 400-800lm, then pick a shape that suits the shade. If you want to dim the lamp, check that both the bulb and the dimmer are compatible.

A table lamp is only as good as the bulb inside it. The wrong bulb can glare, flicker, look ugly through a shade, or simply not fit. The right one makes a small pool of light that feels calm and useful.

This guide gives you a simple order of decisions: fitting, shape, light colour, brightness, dimming, and smart control. Work through them in that order and you will avoid the most common mistakes.

First, match the fitting and the physical size

Check the lamp holder before anything else. In the UK, table lamps usually take an E27 (standard screw) or E14 (small screw) bulb. Some older or imported lamps use B22 bayonet or GU10, so look at the holder or the old bulb if you have it. If the lamp has a shade with a narrow opening, measure the space: a bulb that is too wide or too tall will either not fit or will poke out above the shade.

Also check the maximum wattage or LED equivalent stated on the lamp. Most modern LED bulbs run cool, but a high-output bulb in a small enclosed shade can still shorten the life of the fitting. When in doubt, choose a lower-lumen bulb and add a second lamp rather than overloading one.

• E27 and E14 are the most common table lamp fittings in the UK.
• Measure the shade opening and the height inside the shade before buying a large bulb.
• Never exceed the maximum wattage printed on the lamp holder.

Choose a shape that works with your shade

The shape of the bulb changes how the light leaves the shade. A classic A60 or golfball shape gives a fairly even glow and suits most fabric or paper shades. A tube or tubular bulb, such as a T30, can look striking in an open shade or a bare-bulb lamp, but it can also create a more directional light. A larger globe or porcelain bulb makes a feature of the bulb itself, so it works best where the bulb is visible.

If your lamp has a narrow shade, a smaller golfball or candle shape is usually the safest choice. If the bulb is hidden, shape matters less and you can prioritise brightness and warmth.

• Visible bulb? Treat it as part of the design and choose a shape you like.
• Hidden bulb? Prioritise light quality over looks.
• Tubular bulbs can look sharp in open frames but may glare in a deep shade.

Pick the light colour and brightness for the task

Light colour is measured in Kelvin (K). For a table lamp used for relaxing, reading, or bedside use, warm white around 2700K is the usual choice. Cooler white (4000K and above) can feel clinical in a living room and is better for a desk or utility area. Brightness is measured in lumens (lm), not watts. A bedside lamp often needs 400-600lm, while a reading lamp may need 800lm or more.

If you use the lamp for close work, look for a bulb with a high colour rendering index (CRI) so colours look natural. For general atmosphere, a slightly lower output with a warm colour is usually more comfortable than a very bright cool bulb.

• 2700K for warmth and relaxation; 4000K for focused tasks.
• 400-600lm for bedside; 800lm+ for reading.
• Higher CRI (90+) helps with reading and colour accuracy.

Decide whether you need dimming or smart control

Dimming is one of the most useful upgrades for a table lamp, but it only works if the bulb and the dimmer are compatible. Some LED bulbs are marked as dimmable and will work with a trailing-edge LED dimmer; others will flicker or buzz. If your lamp has a built-in dimmer, check the bulb’s dimming specification before buying. If you want to add dimming, a plug-in dimmer or a smart plug can be a simpler route.

Smart bulbs add app control, scheduling, and sometimes colour tuning. They can be useful for bedside lamps that you want to fade out at night, but they add complexity and usually need a hub or Wi-Fi. If you just want a warm, reliable glow, a simple dimmable LED is often the better buy.

• Only use dimmable bulbs with a dimmer, and match the dimmer type.
• Smart bulbs are handy for schedules but need a stable network.
• A plug-in dimmer can add dimming without changing the lamp.

Decision rules for buying a table lamp bulb

• If the bulb is visible: Choose a bulb whose shape and finish you like, such as a porcelain or tubular design. Check that it fits within the shade and does not overpower the lamp. Visible bulbs are part of the decor, so treat them as a design choice.
• If the lamp is for reading: Aim for at least 800lm and a warm white colour around 2700K. A higher CRI will make text and colours easier on the eyes. Brightness and colour quality matter more than shape when the bulb is hidden.
• If you want to dim the lamp: Buy a bulb marked as dimmable and check it matches your dimmer type. If your lamp has no dimmer, consider a plug-in dimmer or a smart plug instead of changing the wiring. Dimming only works when the bulb and dimmer are compatible.

Bulbs that work well in table lamps

• Tala Porcelain III E27 Bulb - 3x: The Porcelain III is a larger version of the Porcelain II, with a matte porcelain finish designed to last and emit a soft warm light. It is described as lasting 15 times longer than a traditional bulb. A good choice when the bulb is visible and you want a soft, warm glow with a sculptural look. Its larger size means you should check the shade opening before buying.
• Tagra Golfball E27 Bulb - 5x: A 5-pack of small LED filament lamps with a warm white glow from Tagra. A practical, low-cost option for smaller table lamps or where you want a neat, unobtrusive bulb. The golfball shape suits most standard shades.
• Baton T30 E27 LED CLEAR - 5x: A tubular LED filament lamp with a flat bottom and an E27 fitting. It is dimmable on an LED dimmer and produces a 2700K atmospheric light distributed over the whole shape. Useful if you want a dimmable, warm bulb with a distinctive tube shape. The flat bottom helps it sit neatly in some lamp holders, and the 2700K colour suits relaxed settings.

Is this bulb right for your table lamp?

Best for

• Bedside lamps where a warm, soft glow is more important than maximum brightness
• Living room table lamps with a visible bulb where shape and finish matter
• Reading lamps that need a brighter, higher-CRI bulb

Not for

• Lamps with a non-standard fitting such as B22 or GU10 unless you match the fitting
• Enclosed shades where a large bulb may not fit or may overheat
• Anyone who wants a simple on/off bulb and does not need dimming or smart features

Choosing a table lamp bulb comes down to fitting first, then shape, colour, brightness, and control. Take a minute to check the holder and shade, and you will end up with a lamp that looks good and works the way you need it to.