It is a common misconception that LED bulbs aren’t dimmable. But that isn’t the case. Dimmable LED bulbs are dimmable as long as you team them with a compatible LED dimmer switch.
If you have an existing dimmer that is currently dimming incandescent or halogen lamps then it is unlikely that it will be suitable for dimming LED lamps. This is because most traditional dimmer switches are designed to be used with high-power circuits to drive filament lamps which were dimmable by just a voltage change.
So, make sure to find a compatible LED dimmer switch to replace your old fixture. Some dimmer switches are suitable for both low voltage 12v LED lighting dimming and 240V mains LED dimming.
CHECKING EXISTING DIMMERS FOR LED COMPATIBILITY
If you currently have dimmer switches, your electrician will need to check with the manufacturer to see if the switch supports LED for dimming lighting. Your electrician will ensure that the correct dimmer, driver and number/type of lamps used are correct for your LED installation. We wouldn’t recommend trying to do this yourself.
We also recommend that this is done each time an existing dimmer needs to be checked. This is because manufacturers change and update their products and components from time to time. There are instances where LED lamps have been used with existing dimmers and it has been found at a later date that the LED lamp components have changed and the dimmer and LED lamp are no longer compatible.
The use of either a leading edge or trailing edge LED dimmer will be needed for an LED installation. However, which one used will depend on the manufacturer’s recommendations. As a general rule, leading edge has been found to be more compatible with LED lighting. Check on the dimmer – it should state LED if compatible. If it has markings such as 60 – 400 watts then this is unlikely to be compatible.