3 disadvantages of a 12v led system 1.
12v led home lighting system.
Since the resistor does not contribute to illumination we can conclude that in a 12v led strip approximately 25 of the electrical energy is dissipated as waste heat.
Most led lights are arranged so that they can run off of a 12v battery in fact 12v lights can cause a short when plugged directly into a socket which usually have 110v current.
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The 12v lights here draws another 5a h per winter night.
This draws 1 4a at 12v.
For example a 120v led system will pull 1 amp in a 120 watt system while a 12v led system will need to pull 10 amps to power the same 120 watt system.
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The bedrooms draw maybe another 1ah.
With 12v systems the lower voltage means more current must be supplied to compensate.
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The current draw is thus.
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At 3v each the total led voltage is 21v or about 88 of the 24v input.
They last for many hours and a gently used light can last up to 25 years.
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Led lights are a popular way of saving money in the home.
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Why does the amperage matter.
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In a 24v led system there is typically enough voltage overhead to allow for 7 leds in series per string.