How to Replace a Bulb and Choose the Right One for Your Lamp

Quick answer

To replace a bulb, switch off and unplug the lamp, let the old bulb cool, then twist it out and match the base, wattage and brightness before fitting the new one. For most lamps, choose a warm 2700K bulb for relaxing rooms and a brighter 4000K bulb for tasks or entryways.

A burnt-out bulb is a small annoyance, but choosing the wrong replacement can leave you with a lamp that flickers, feels too dim, or simply does not fit. The good news is that replacing a bulb takes a minute once you know which details actually matter: the base type, the brightness in lumens, and the colour of the light.

This guide walks through the replacement process step by step, then explains how to choose a bulb that suits the room and the lampshade. You will also find honest notes on where the information on a bulb label can be incomplete, so you can make a confident choice without guessing.

Before you start: safety and the right bulb base

Always switch off the lamp at the wall and unplug it if possible. If the bulb has been on, give it a few minutes to cool, because halogen and incandescent bulbs get very hot. LED bulbs stay much cooler, but the metal base can still be warm.

The most common base in home lamps is E27, a standard screw fitting about 27 mm across. Smaller lamps and some decorative fixtures use E14, a narrower screw base. Bayonet fittings exist too, but they are less common in modern Danish-style lighting. Check the old bulb or the lamp holder to confirm which base you need before buying.

• Common mistake: forcing a bulb that does not thread smoothly. If it resists, stop and check the base type.
• Checkpoint: the old bulb should unscrew with light pressure, not a hard twist.

Step-by-step: removing the old bulb

Hold the bulb by the base or the glass, not by the metal threads, and turn it counterclockwise. If it is stuck, wait until the lamp is fully cool, then use a dry cloth or a rubber glove for extra grip. Never use water or a wet cloth near a socket.

Once the bulb is out, look at the socket for any signs of damage: scorch marks, a loose centre contact, or a cracked housing. A damaged socket needs a replacement lamp or a qualified repair, not a new bulb.

• Common mistake: twisting the glass instead of the base on a stuck bulb, which can break it.
• Checkpoint: the empty socket should look clean and undamaged before you fit a new bulb.

Choosing the right brightness and colour temperature

Brightness is measured in lumens, not watts. As a rough guide, a 400–500 lumen bulb suits a bedside table lamp, 800–900 lumens works well for a living room floor lamp, and 1500 lumens or more is better for overhead lighting or an entryway. Colour temperature is measured in Kelvin: 2700K gives a warm, relaxing glow, while 4000K is a natural white that feels crisper and more alert.

If you want a bulb that is visible through the shade, size and shape matter as much as brightness. A large, warm bulb can become part of the design, while a small bulb disappears behind an opaque shade. For dimming, check that both the bulb and the lamp are dimmable, because not all LEDs dim smoothly.

• Common mistake: buying a bulb by wattage alone. Watts tell you energy use, not light output.
• Checkpoint: match the lumen output to the room's task, and the Kelvin to the mood you want.

Fitting the new bulb and testing it

Screw the new bulb in clockwise until it is snug. Do not overtighten, especially on E14 bases, as this can damage the socket. Restore power and switch the lamp on. If it flickers or does not light, switch off again and check that the bulb is fully seated and that the lamp is compatible with the bulb's wattage.

If the light feels too harsh, try a warmer Kelvin rating. If it feels too dim, move up in lumens rather than watts. Keep the packaging or note the model number so you can reorder the same bulb when it eventually wears out.

• Common mistake: leaving a bulb loose enough to flicker, then blaming the lamp.
• Checkpoint: a steady, instant light means the bulb is correctly fitted.

Bulb replacement steps at a glance

1. Switch off and cool down: Turn off the lamp at the wall and unplug it. Wait a few minutes for the old bulb to cool before touching it. Never rush a hot bulb; a cool bulb is easier and safer to remove.
2. Remove the old bulb: Grip the base or glass and turn counterclockwise. Use a dry cloth or rubber glove if it is stuck, but never force it. If it will not budge, stop and check for damage rather than risking a break.
3. Match the base and brightness: Confirm E27 or E14, then choose lumens for brightness and Kelvin for warmth. Check dimmer compatibility if you use one. Buying by lumens and Kelvin gives a better result than buying by watts.
4. Fit and test the new bulb: Screw the new bulb in clockwise until snug, restore power and switch on. If it flickers, switch off and reseat it. A steady light means you are done; if it still flickers, the lamp or dimmer may be the issue.

Bulbs that suit common lamp needs

• Good Idea E27, 6W LED, 2700K, 830 lm | bulb: Good Idea has an E27 base and a warm, medium-bright light, making it perfect for places where you want a relaxing atmosphere, like a living room or bedroom. If you are replacing a bulb in a lamp used for winding down, this warm 2700K output is a straightforward match.
• Bright Idea E27, 13W LED, 4000K, 1580 lm | bulb: Bright Idea 13W has an E27 base and a natural white light that is a balance between warm and crisp, suitable for overhead lighting or an entryway. Choose this when you need more lumens and a crisper colour for tasks, hallways or general room lighting.
• Big Idea E27, 3W LED, 2200K, 350 lm | bulb: Big Idea 3W has an E27 base and, at 12.5 cm, is the biggest lightbulb in the range, making it perfect for lampshades where the bulb is meant to be seen. If your lamp has a shade that shows the bulb, this large, warm bulb becomes a visible design feature rather than a hidden component.

Replacing a bulb is simple when you check three things: the base, the lumens and the Kelvin. Start with the old bulb in hand, match those details, and your lamp will look and feel the way you intended.