Using a relay isn't a particularly good idea, unless you are using an ultra fast non automotive relay, but regular automotive relays have a switching time usually around several milliseconds, which although doesn't sound a lot in an emergency situation on a motorway could mean that someone stuffs up the back of you.
It wouldn't be your fault, but I would prefer not to have to go through the hassle of going through insurance etc.
The standard switch can easily switch a pair of standard lights plus a LED high level light.
Paul
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