LED Bulb Swap Guide

The 'Why'

LEDs flicker, stay off, or buzz because of wrong fittings (e.g. non-dimmable on a dimmer), incompatible bases, or failed lamps. Old halogen dimmers often don't work with LEDs. Matching the base and using "dimmable" bulbs fixes most issues.

The 5-Minute Fix

• Switch off and cool: Turn off the light, wait a minute, then remove the old bulb (twist anticlockwise for bayonet, unclip for GU10). Match the base: B22, E27, E14, or GU10.
• Choose the right LED: Same base and wattage (or lower). On a dimmer? Use "dimmable" and ideally "trailing edge" compatible. Non-dimmable LEDs on dimmers often flicker or buzz.
• Fit firmly: Push and twist clockwise (bayonet) or screw in gently (Edison). Don't overtighten. Try the bulb in another fitting to rule out a faulty lamp.

When it's more than a simple reset

If the right bulb still fails or flickers, likely causes include:

• Incompatible or old dimmer - trailing-edge dimmers may be needed; upgrade by a qualified electrician.
• Faulty lampholder or fitting - loose contacts, corrosion, or damaged wiring.
• Downlight transformer/driver failure - LED downlights often have built-in drivers that can fail.

For dimmer upgrades, downlight replacements, or full lighting design, see our LED Downlight Conversion and Lighting services.