I would just make sure the underrun the Lumileds and keep them voltage regulated. Although Lumileds are quality and very hardy, they will be run in a constant on state when the running lights are on and for extended periods at stop lights which can build up heat if they're pushed too far. I presume they're the 70mA ones. I would suggest running them at 50mA with a 12v regulator.
Also, AZDave at hidplanet.com sells a PWM setup that includes a voltage regulator. It's cheap and does everything you need.
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