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LED Dimmer Switches

An LED lamp draws so little power that an older dimmer often cannot see it, which is why a dimmer that worked for years starts to flicker or buzz after a relamp. We stock Knightsbridge's intelligent dimmers, built for low LED loads and sold in one to four gangs, two way, each with the wattage range printed on its own page so you can match it to the circuit before you buy.

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Why an LED lamp needs a different dimmer

A halogen lamp is a resistive load and behaves predictably as the voltage falls. An LED lamp is an electronic driver, it draws a fraction of the current, and it responds to being dimmed in whatever way its driver was designed to. That is the whole of the problem: a dimmer built for filament lamps often sits below its minimum load with LEDs on the circuit, and the symptoms are flicker, a buzz from the plate, lamps that will not strike at the bottom of the range, or a dimmer that runs hot. Replacing the dimmer rather than the lamps is usually the fix.

What intelligent means here

Almost everything in this range is described as intelligent, and that is a specific behaviour rather than marketing. The dimmer senses what it is driving and sets its own dimming method to suit, instead of asking you to pick one and hope. In practice that means one part number works across a mixed house, and it is why these are the safer choice when you do not know which driver is inside the lamps you already own.

Reading the load range

Every dimmer here carries two figures and both matter. The first is the range for ordinary lamps, the second the range for LED, and the LED figure is always the lower of the two because an LED circuit draws so much less. Add up the lamps on the circuit and check the total sits inside the LED range, not just under the top of it: falling below the minimum is what causes flicker at the dim end, and it is far commoner in a modern house than exceeding the maximum.

Two way dimming, and why only one end dims

Most of this range is two way, so a light can be controlled from two positions. What surprises people is that only one of the two positions is the dimmer. The other is an ordinary two way switch: it turns the light on and off at whatever level the dimmer was left at. Fitting dimmers at both ends of a two way pair does not give you two dimmers, it gives you an unreliable circuit.

One to four gangs

The range runs from single gang up to four, and the multi-gang plates are the reason a kitchen or an open-plan room can be controlled from one position. Worth knowing before you order: every gang has its own load range and they do not pool, so a four gang plate is four separate small dimmers rather than one big one. A heavily loaded circuit is better on its own single gang plate than crammed onto a four.

Plates, finishes and depth

Screwless, flat plate and curved edge profiles all appear across the finishes, so a dimmer can match the switches already on the wall rather than announcing itself. The practical constraint is depth: a dimmer is a bulkier mechanism than a switch and frequently needs a deeper back box than the plate it replaces. Check the box before ordering, because a dimmer forced into a shallow box runs hot, and heat is what shortens its life.

Frequently Asked Questions

Will any LED lamp work on these dimmers?
Only lamps marked dimmable. A non-dimmable LED on a dimmer will flicker, buzz or fail early, and no dimmer can correct that. Check the lamp box first, then check the circuit total sits inside the dimmer's stated LED range.

My LEDs flicker at the bottom of the range. What is wrong?
Usually the circuit is below the dimmer's minimum load rather than above its maximum, which is common in a house relamped to LED. Either move to a dimmer whose LED range starts lower, or check the lamps are all marked dimmable, which is the other frequent cause.

Can I dim from two positions?
You can control from two positions, but only one of them is the dimmer. The second position is an ordinary two way switch and turns the light on and off at the level the dimmer was left at. Two dimmers on one two way pair is not a working arrangement.

Do the gangs on a multi-gang dimmer share their load?
No. Each gang has its own stated range and they do not pool, so a four gang plate behaves as four separate dimmers. Size each circuit against one gang's range rather than against the plate as a whole.

Will a dimmer fit the back box my switch is in?
Often not. A dimmer mechanism is deeper than a switch and frequently needs a deeper box. Measure before ordering: a dimmer squeezed into a shallow box runs hot, and heat is what shortens its life.

Can I put a dimmer on my bathroom lighting?
That depends on where the plate sits relative to the bath or shower, which is a zoning question for the electrician doing the work. The dimmer itself is not the deciding factor.

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