Old light fixture broken, time to order a new driver – sounds simple. Until you realize that there are LED drivers and LED power supplies and you don't know the difference. Both devices look similar, cost about the same – and yet, you must never mix them up.
What is an LED power supply?
An LED power supply – also known as a constant voltage device – converts the mains voltage of 230 volts into a lower, constant voltage, usually 12 or 24 volts. The connected LEDs or LED strips always receive the same voltage, regardless of how many lamps are connected.
LED power supplies are ideal for LED strips and systems where many LEDs are operated in parallel. Anyone using LED strips under kitchen cabinets or in the living room at home generally uses an LED power supply.
What is an LED driver?
An LED driver – also known as a constant current device – does not provide a constant voltage, but rather a constant current. This is important because LEDs are very sensitive to fluctuations in current. Too much current can destroy an LED in seconds.
LED drivers are mainly used for high-quality recessed lights and downlights where the LED is powered directly by the driver. Many modern recessed spotlights have the driver already built in – you don't even see it from the outside.
How do I know what I need?
The easiest method: A look at the existing light fixture or the old driver. It will state either Constant Voltage (CV) – then you need a power supply – or Constant Current (CC) – then you need an LED driver.
If you are unsure, check the light's instruction manual or give the manufacturer a quick call.
Can I substitute a power supply for a driver and vice-versa?
No – you should never do this. Connecting a constant voltage power supply to a light that requires a constant current driver can permanently damage the LED. When in doubt, always ask the manufacturer or consult a professional.
In summary
An LED power supply provides constant voltage – ideal for LED strips and parallel systems. An LED driver provides constant current – ideal for recessed lights and downlights. Knowing this ensures you always buy the right thing – and protects your LEDs from premature failure.
At Saasil, you will find both LED power supplies and LED drivers in various performance classes – the right solution for every area of application.
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