Just gotta say, if you pay the premium to have actual DOT-rated, legal LEDs, you'll pay a lot for them...plus the company probably went to the effort to make them "omnivolt" to work in 12 or 24V systems. They still don't have to do that, so read the packaging and make sure they are rated for the application before buying and committing.
If you cheap out and buy lights not actually DOT certified, it's a total crapshoot. They're probably low quality lights, and the company has no obligation to ensure they hold up to automotive standards. You're much more likely to encounter single voltage LEDS here.
And last point, LEDS are extremely voltage sensitive... go buy an unprotected LED and put it about 3V over its rated voltage and watch how fast it changes color, permanently turns off, and possibly even catches fire! Voltage surges kill LEDS frequently. Because of this sensitivity, quality manufacturers build voltage regulators to keep the actual delivered voltage to the emitter in-check, so most saw the advertising benefit of using hardware that would adapt to a much wider voltage range since they're already needing to build more of the hardware in the first place to keep them safe from 12V surges.
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