How do I choose the right LED driver for my lighting application?

Choosing the correct LED driver is vital when installing LED lighting that is not 230-240v as it will directly affect the operation, safety, and lifespan of the LED lights.  A LED driver converts mains electricity (typically 230-240V AC in the UK) into the required voltage that the LED light needs.  This could be 12V or 24V and might also require the voltage to be constant voltage or constant current.

The first thing you should do is identify if your LED product requires a constant voltage or constant current driver.  LED strip lights for example will almost always use a constant voltage driver rated at 12V or 24V.  In contrast, many integrated LED fittings will require a constant current driver.  This includes fittings such as downlights or LED panels.

Once you’ve identified the correct type of driver you will then need to match the output specifications.  If you are using a constant voltage driver you will need to match the voltage exactly.  For example - a 24V LED strip must use a 24V driver.  Using a 12V for example would result in dim or non-functioning lights and a higher voltage driver would likely cause permanent damage to the LEDs.  If you are using a constant current driver you must match the current rating (e.g., 350mA, 700mA).  This is crucial as it determines how much electricity flows through the LED light.

Next you should consider the wattage/power capacity of the driver.  To figure out what you need you will need to add up the total wattage of all connected LEDs and include a safety margin of around 10–20%. For example, if your LED strip consumes 80W we would recommend that you choose a driver rated for at least 90–100W.  This 10-20% buffer prevents the driver from running at full capacity continuously and this reduces heat buildup which helps to extend the lifespan of the driver.

Environmental conditions are also crucial.  By this we mean that you will need to consider where the driver is being installed.  If your installation is outdoors, in a bathroom, or in any damp or dusty environment you will need a driver with an appropriate IP rating (Ingress Protection).  For any of these environments listed you will need an IP65 driver or above.  IP65 drivers are protected against water jets, while IP67 or IP68 offer higher levels of protection.  If you are using the LED driver indoors with no risk of water a driver that is IP20 rated will be suitable.

When you are installing your driver you should consider where you are going to install the light and if there will be adequate ventilation.  LED drivers generate heat and poor airflow can shorten their lifespan.  If you are needing to install the driver into a tight space you should choose a compact, high-efficiency driver designed for enclosed environments.

Another important factor to consider is dimming compatibility.  If you are looking to dim your LED lights you need to make sure that the driver supports the type of dimming system you intend to use.   This could be trailing edge; leading edge, 0–10V, or DALI.  Using an incompatible driver can cause flickering or mean that the lights will not dim at all.  You can establish the type of dimming you need by looking at the specifications for your dimming system (such as the controller or dimming switch) and on the lights as well.