Overview
Changing a lightbulb might seem too basic to need a guide — but there are genuinely useful things to know: how to do it safely, how to read bulb specifications, and how to choose the best replacement. This guide covers all of it, step by step.
What You'll Need
- A replacement bulb (correct fitting and wattage — more on this below)
- A sturdy step ladder or stool (if needed)
- A dry cloth or rubber gloves (optional but helpful)
- A few minutes
Step 1: Turn Off the Light and Allow It to Cool
Switch off the light at the wall switch. If the bulb has been on, wait at least 5–10 minutes before touching it — bulbs, especially halogen and incandescent types, get very hot. Touching a hot bulb with bare skin can cause burns, and touching a halogen bulb with bare fingers (even when cold) can leave oils that cause the glass to heat unevenly and crack.
Tip: For extra safety with ceiling or overhead fixtures, consider also switching off the circuit at the fuse box, especially if you're unsure about the wiring.
Step 2: Position Your Ladder or Stool Safely
If the fitting is overhead, use a proper step ladder rather than balancing on a chair. Make sure the ladder is on a flat, stable surface and positioned so you don't have to overreach. Overreaching is one of the most common causes of falls.
Step 3: Remove the Old Bulb
The removal method depends on the fitting type:
- Bayonet (B22): Common in the UK. Push the bulb gently inward, turn anti-clockwise until it unlocks, then pull it out.
- Screw (E27 / E14): Common in Europe and increasingly the UK. Simply turn anti-clockwise until it releases.
- GU10 / spotlight: Push gently and turn anti-clockwise (about a quarter turn), then pull straight down.
- Pin base (G9, G4): Pull firmly but gently straight out. Use a dry cloth to avoid touching the bulb directly.
Handle the old bulb carefully — if it's a compact fluorescent (CFL) bulb, avoid breaking it as these contain a small amount of mercury vapour.
Step 4: Check the Fitting and Wattage
Before buying a replacement, check the old bulb for:
- Cap/fitting type (e.g., B22, E27, GU10) — usually printed on the base
- Wattage rating — don't exceed the maximum wattage listed on the fixture
- Voltage (most UK fixtures are 240V; some spotlights use 12V)
Step 5: Choose the Right Replacement Bulb
In most cases, LED bulbs are the best choice for replacements. Here's a quick comparison:
| Bulb Type | Energy Use | Lifespan | Heat Output |
|---|---|---|---|
| LED | Very low | 15,000–25,000 hours | Low |
| CFL (Compact Fluorescent) | Low | 8,000–15,000 hours | Low–Medium |
| Halogen | Medium | 2,000–4,000 hours | High |
| Incandescent | High | 1,000 hours | Very High |
When buying an LED, check the lumen output rather than watts to match the brightness of your old bulb. As a rough guide: a 60W incandescent is equivalent to roughly 800 lumens from an LED.
Step 6: Install the New Bulb
Insert the new bulb using the reverse of the removal process — twist clockwise for screw fittings, push and twist clockwise for bayonets. Don't overtighten. Once secure, switch the light back on to confirm it works.
Disposing of the Old Bulb
Don't put CFL or fluorescent bulbs in general household waste — they contain small amounts of mercury and should be taken to a local recycling centre or electrical retailer that accepts them. LED and incandescent bulbs can generally go in general waste, though check your local council's guidance.
You're Done!
That's all there is to it. With the right bulb choice, especially switching to LEDs, you'll also save on energy bills and won't need to repeat this process for many years to come.