Why Are My Lights Flickering in Melbourne?

Diagnosing the Scope of the Flicker

To pinpoint the fault, determine whether the issue is localised (one globe), circuit-wide (one room or group of lights), or whole-house:

• Single Fitting: Loose globe, dying LED driver, or a worn lamp holder.
• Single Room / Circuit: Incompatible dimmer mechanism, overloaded circuit, or loose junction box in ceiling.
• Entire House: Loose neutral connection at switchboard or incoming street mains connection problem.

Our electricians use digital oscilloscopes and true-RMS multimeters to measure supply voltage stability under load and rectify the root cause safely.

Common Causes of This Issue

1. Incompatible or Outdated Dimmer Mechanism

Older leading-edge dimmers designed for 50W halogen globes cannot regulate low-wattage (8W-10W) LED downlights smoothly, causing strobing and flickering at mid-range brightness levels.

2. High-Draw Appliance Inrush Voltage Drop

Large motors (such as air conditioning compressors, pool pumps, or vacuum cleaners) draw heavy starting current, causing momentary voltage dips on shared lighting circuits.

3. Loose Wiring Terminals or Junction Connections

A loose screw terminal at the light switch, ceiling rose, or junction box creates variable contact resistance as vibrations occur throughout the building.

4. Loose Main Neutral Connection (Hazardous)

A deteriorated neutral connection in your main switchboard or at the overhead service mains connection causes severe, whole-house voltage imbalance.

What You Can Check Safely vs What Requires a Licensed Electrician

✅ What You Can Check Yourself

• Check whether the flickering affects only a single light globe or multiple rooms.
• If it is a single lamp, turn off the switch and ensure the globe is seated tightly in its socket.
• Observe whether flickering coincides with the refrigerator compressor or ducted heating turning on.
• If dimmable LEDs are installed, adjust the dimmer wheel to full brightness to see if the flickering stops.

⛔ Requires a Licensed Electrician (REC)

• Testing incoming supply voltage and verifying neutral loop impedance.
• Replacing obsolete leading-edge dimmers with electronic trailing-edge LED dimmers.
• Tightening and testing busbar connections and neutral links within the main switchboard.
• Tracing circuit wiring in the ceiling cavity to locate failing cable joints.

Under Victorian law, all fixed electrical wiring, switchboard modifications, and power point replacements must be performed by a Registered Electrical Contractor (REC) and issued a Certificate of Electrical Safety (CES).