It was actually used in many old systems as it was much easier to create a 12vac transformer compared to a dc transformer and incandescent bulbs could care less about ac or dc power.
Low voltage transformer for led lights.
Low voltage lighting systems require lower voltage to operate than the typical power source supplies.
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In addition led lamps will turn on at both higher and lower voltages without having their brightness affected like old school halogen lamps would.
No low voltage ac lighting is not just used in landscape lighting to try and spite all those switching to leds.
So if the power source in your wall outputs 120 volts low voltage lighting fixtures require an input of just 12 or 24 volts.
House current 120 volts is reduced by a transformer to 12 to 20 volts the current needed to operate low voltage landscaping lights.
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The input voltage stands between 100v to 240v and the output voltage is around 12v.
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The voltage that the light fixture needs is the same as the voltage supplied from your wall.
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In the world of low voltage landscape lighting led lamps have also become prevalent.
It is known as a perfect voltage regulator for lights that are considered as low voltage single color or the rgb led types of lights thanks to its operating power of 60w.
In fact they have allowed us to create larger lighting systems often without the need for larger transformers.