There's three components to aux lights: the lights themselves, the wiring with a relay and a waterproof switch, and the lighting bar to mount the lights on the bike. The advantage of the TT/Wunderlich stuff is that all three come in one purpose designed pack, but then you pay the earth for them.
I have a pair of the Halfords lights (brand name is Ring) on my Tenere and they are ideal for my needs which are additional 'presence' plus some additional light.
Some of the Halfords sets come with a ready made lighting harness, though this is for a car and needs to be cut down a bit. Alternatively make your own with a relay. You'll still need a waterproof switch and a lighting bar.
I have yet to find a lighting bar for my F650GS twin, otherwise I would put them on that bike as well.
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