And those LEDs are actually "dual intensity" lights. The array has a separate feed that allows the lights to come on at a low level, just like your tail lights. So, if you were inclined to do so, you could have the light gently glowing by wiring it in to the tail light feed (on an ERA that's actually
easier than the brake feed). The high intensity would still come on with the brakes. I might do that, just to see how it looks. I vaguely recall that most states have rules requiring tail lights to be in pairs, not that we pay much attention to that sort of stuff.
Yeah, I think I will do that.
EDIT -- It occurred to me, in the shower, that I don't have to tap off the tail lights. The feed to the license plate light itself is the same feed and it's literally right there. I'd have felt pretty dumb if I had run a feed from the tail lights over to the LED and then thought of that....