First, they both use a magnitude less energy then incandescent and halogen lights and still less then compact fluorescent lights. But between the two types of LED lights? - Low voltage lights actually draw higher amperage (refer Ohm's Law.) This means that you ONLY save more energy with a Low voltage LED light than with a High voltage one if you do one of these:

- Use maximum possible length operated from the same transformer -- best exploited with a low voltage LED strip light; OR

- Power your LED from a low voltage source such as a 9V battery.

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