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The current USDOT regs date to 2007, so they're obsolete. They even still talk about sealed beam bulbs. Most LEDs aren't DOT approved because the approval process takes not months but years. As a manufacturer by the time your LED gets tested you've probably moved on to the next product generation. As for finding the DOT regs with respect to lumens, good luck. You'll sooner find Waldo. Most of what you can decipher from the DOT regs relate to beam patterns and minimum candlepower measured at 100 feet.
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