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LED transformer - what should you watch out for?

If you gradually convert your light sources from conventional lamps to LEDs, it is often necessary to replace the associated technology. For example, a must Transformer for halogen lights can usually be replaced with an LED transformer.

You can find out why this is the case and what needs to be considered with a transformer for LEDs in this article.

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When do I need an LED transformer?

There are LED bulbs that can with 230 V. operate. But there are also those with a Voltage of 12 V. must be operated. A 12 V transformer is used for the latter. This regulates the standard voltage in the house down from 230 V to 12 V, which is compatible with the LEDs.

With LEDs, it doesn't really matter whether Direct current (DC) or Alternating current (AC) is present. Most of the LED light sources have an integrated converter which converts AC into DC. The disadvantage here, however, is that heat is generated during this conversion process, which heats the light source and reduces the service life of the LED. It is therefore always advisable to use a transformer that supplies direct current. In principle, however, AC transformers can also be used.

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You have to pay attention to these 3 things with the LED transformer!

LEDs have a quite sensitive electronics, which is why they place special demands on a transformer and a transformer for halogen lights cannot simply be taken over.

Note the basic load

The nice thing about LEDs is that they are so consume little electricity. What is usually a reason to be happy comes with a few problems when using conventional transformers. Because halogen lamps, for example, have a very high power consumption, many transformers for halogen lamps have a minimum load that they need for operation.

In the case of a transformer with a minimum load of 30 W, for example, at least 3 halogen lights with 10 W each would have to be connected. LEDs, however, consume much less power, which is why only LEDs with 5 watts each would be needed for the same light output. So it is difficult to achieve the base load of the transformer with LEDs. If the base load is not reached, the transformer cannot work properly, which is in Flickering, erratic lighting as well as a shorter lifespan.

It is therefore recommended to use LED transformers which do not need a base load in order to be able to work optimally.

Exact tension is required

While other bulbs in stuff Voltage variance are quite robust, the electronics in the LEDs are quite sensitive. If the voltage deviates upwards or downwards by more than 0.5 V, the light source can be damaged or completely unusable.

That is why a transformer is required for LEDs, which always delivers exactly 12 V - these are so-called stabilized transformers or constant voltage transformers.

Allow for high inrush current

Another point that should not be ignored with LEDs is that high inrush currentswho need these special bulbs. Although they consume little power during operation, they briefly require significantly more power for the duration of the switch-on. This is used, for example, to charge the capacitors.

This additional consumption should be taken into account when dimensioning the LED transformer, otherwise the transformer will register an overload and switch itself off. As a rule, one speaks of 30 to 40 percent, which should be included as a buffer.

The determination of the transformer power could look like this, for example:

4 LEDs with 6 W each are to be connected:

4 x 6 W = 24 W.

The buffer must now be calculated for this:

24 W x 1.4 = 33.6 W.

In this case, a 35 W transformer would have to be used. If you want to change the light source again later and connect more powerful LEDs, you can also consider installing a 40 W LED transformer.

LED transformer with dimmer

The Possibility to dim LEDs has developed rapidly in recent years, but is still associated with certain difficulties. A ballast is always required for this, which decouples the LED light source from the alternating current and is also able to forward the corresponding signals to the LED for dimming.

To solve this problem, there are now also LED transformers that are dimmable. The prerequisite is of course that the light source is compatible with the corresponding device. Most LED manufacturers, however, have lists on their websites on which you can give recommendations for compatibility. As usual for dimmers, the LED transformer dimmers are also available with remote control.


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