Most flicker is a dimmer and a driver that were never designed to work together, and it costs almost nothing to put right. A small proportion is a connection failing, and that one does not improve on its own.
Flickering lights: a dimmer and driver that do not match
Modern lamps contain a driver, and not every driver works with every dimmer. The symptom is flicker or a faint buzz at the lower end of the range, steady at full output, and identical every time. It is a compatibility problem rather than a fault, and it is a different thing entirely from light fixture repair.
The fix is matching the two, which usually means the right dimmer rather than different lamps. Anyone selling you a rewire for this is answering the wrong question. Where the fitting is being changed anyway, light fixture installation covers picking the pairing before ordering rather than afterwards.
The same applies to downlights, which are the most common place this shows up because there are so many drivers on one dimmer. Pot light installation sets out how the pairing gets checked at the point of specification, which is where it belongs.
Fresh install
How it runs
A flickering lights call in Buffalo, four steps
Describe the pattern
One fitting or several, at full output or only dimmed, and whether it follows something switching on. The pattern is most of the answer.
Rule out the control
Dimmer and driver checked together first, because that is what it usually is and it costs least to establish.
Then the connections
If the control is not the cause, we work back along the circuit rather than replacing fittings hopefully.
Fix and verify
Tested through the whole dimming range rather than just switched on, so the same complaint does not return.
The kind that matters
Flickering lights that follow a large load
The pattern to take seriously is different. Lights dip when something large starts, and keep dipping after the appliance has settled. Or several rooms flicker together rather than one fitting. Or it comes and goes with no pattern at all.
Those point at a connection rather than a control: a loose termination somewhere between the panel and the fitting, which heats under load and degrades further each time. That is the same failure described in breaker panel repair, and thermal imaging is the quickest way to find it.
Where several rooms flicker together and lights brighten in one part of the house while dimming in another, that is a different fault again and a partial power outage covers it.
Almost always a dimmer and driver that were never designed to work together. It is a compatibility problem, it is consistent, and matching the pair fixes it cheaply.
Only one kind. Flicker that follows a large appliance starting, affects several rooms at once, or comes with warmth or a smell is a connection rather than a control.
Sometimes, and it is a reasonable first try for a single fitting. It will not help if the cause is a loose connection, which is why the pattern matters more than the lamp.
The nuisance kind, no. The kind caused by a failing connection, yes: it means heat where there should not be any, and heat gets worse rather than better.
The diagnostic is priced up front either way, but we will tell you plainly when the answer is cheap rather than dressing it up.
They show it more. An incandescent filament stays hot through the dip and hides it; an LED driver does not. The same supply problem was always there, the bulb just made it visible.
Customer reviews
What Buffalo customers say about their flickering lights
