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The dual intensity could be controlled by different voltages. LED's have different brightnesses at different voltages, especially if you get the really bright ones. If you could make a circuit that would output like 2.7V when the lights are on, and 3.3V when the brakes are applied (I'm just making those voltages up, the actual voltages are dependent on the LED's used), it should work. You'd need something that would output those voltages regardless of the input voltage, because the input will probably be fluctuating between 12 and 14V.
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