The buck converters are way more efficient than the old linear voltage regulators. Just make sure you get the good ones. (I have had 2 designs that didn't work well, one that's great. The ones with the LM2596 chip in it work the best. I add a good sized capacitor at the output to keep the lights from flicker. I run strings of LED"s 22 inches long and these guys can handle the current.
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