Picking A 12V Transformer For Patio Lights

Using low voltage lighting for patio lights, is something which more and more people do these days. There are certainly good reasons for doing so – you get the same amount of light but using less electricity – and in some cases (with some types of LED’s) you also get a much more flexible lightsource, capable of changing colors for instance. But using low voltages for lighting adds an extra element – the transformer. A typical voltage used for the types of lightsources mentioned here, is 12 volts.

To get 12v from mains voltage, you need a 12v transformer – and one that will accept the mains voltage in your country. Thankfully, many such transformers today are made with a switchable input voltage setting, making it easier for you to find one that fits your needs. You also need to know how much electrical power is consumed by your lightsources, because that is how much power the lighting transformer of your choice must deliver. In fact, I would recommend you get one with a bit more power than the total consumption of your system (which is calculated as the sum of the power rating numbers on the bulbs used). You should also try to use power wiring which is not too conservatively dimensioned, as that can cause problems as well. Whether a transformer outputs AC or DC voltage is also important. AC – or alternating current – is what old fashioned incandescent bulbs run on, and indeed, many low voltage systems such as halogen lights uses it too. In fact, if you see a 12v transformer advertised as DC, it is actually a transformer plus additional components, to rectify AC to DC. Some lightsources (mostly LED’s) uses DC voltage – but you can certainly also get them for AC (any kind of LED which can be used to replace a mains powered bulb is AC compatible).

Finally, you should consider some of the nifty extras provided with many lighting transformers. I am talking about such things as light sensors to automatically turn on the light at nightfall, thermal breakers to shut the transformer down temporarily if too much power is drawn from it (which could cause a meltdown otherwise) and also take a look at the popular option for timers. This way, you set an interval in which the transformer comes on and off – fully automatically. All very useful features for patio lights and other outdoor lights.

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