I popped-out two plugs that the factory put in the rear bumper of my Mazda and inserted red LED lights in the holes. The lights are wired into my LED DRLs on the front. So, when I'm moving, I've got lights front and rear.
The reason I installed them is because the grey color of my car makes it hard to see under some conditions. I don't want to be run over. The 8W load per light is a small economy cost.
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