Anyone using recessed spotlights or low-voltage lights will sooner or later come across a specific term: the transformer. But what does a transformer actually do – and when do you even need one?
What is a transformer?
A transformer converts standard mains voltage of 230 volts into a lower voltage, usually 12 volts. This is necessary because certain light sources, such as GU5.3 or MR16, cannot be operated directly at 230 volts. Without the right transformer, the lamp would either not work or burn out immediately.
What does low voltage mean?
Low voltage simply means: a low voltage – i.e., 12 or 24 volts instead of the standard 230 volts from the wall outlet. Many people are familiar with this from cars or camping, where 12 volts is also used. In the lighting sector, this primarily applies to older recessed spotlights with GU5.3 sockets as well as many LED strips.
When do I need a transformer?
You need a transformer whenever light sources are operated with low voltage. Modern recessed spotlights with a GU10 socket, on the other hand, operate directly at 230 volts and do not require a transformer – you can simply insert the lamp directly here.
How do I know if my lamp is low voltage?
It’s easier than you think. Simply look at the existing lamp or light fixture – the voltage is usually stated directly on it: 12V means low voltage, 230V means standard mains voltage. Alternatively, take a look at the socket: GU5.3 and MR16 are almost always low voltage, whereas GU10 operates at 230 volts.
Which transformer is right for my lamps?
The most important thing when buying a transformer is the wattage. The transformer must be able to handle at least as much wattage as the sum of all connected lamps. A small buffer upwards never hurts.
For example, if you are operating four LED spots with 5 watts each, you need a transformer with at least 20 watts – preferably one with 30 watts, so that it does not constantly operate at its capacity limit.
LED transformer vs. halogen transformer – is there a difference?
Yes, and that is important. Old halogen transformers often do not work reliably with modern LED lamps. They can cause flickering or shorten the lifespan of the LED. If you are switching to LED, you should therefore also switch to an LED-compatible transformer at the same time.
In a nutshell
A transformer converts 230 volts into low voltage and is necessary wherever low-voltage light sources or LED strips are used. Anyone switching to LED should always check the transformer as well – a compatible LED transformer ensures reliable operation and a long service life.
At Saasil, you will find both classic transformers for older recessed spotlights and modern LED power supply units for current LED systems – meaning there is the right solution for every need.
Discover LED power supply units & constant voltage devices at Saasil now
