I fitted a set of the Ring Micro Cruise-Lite on a custom milled Alu lightbar. They're bloody bright lights (55w H7's I think) and quite small.
On an quiet road they do make the bike very noticable, but they have a very wide flood, so they aren't great for lighting.
I find they are less noticable in evening traffic. They just don't attact enough attention with all the other similar colour lights around.
I put Blue LED's on the last bike I had, and this seemed to get the attention of dozing drivers. Looked a bit boy racer-ish and tacky buy certantly got attention.
I think I'll get a pair of the lights with LED's. Blue is best to get attention, but the White is also quite noticable.(Like those Cateye LED lights on bicycles).
I thought you guys in UK had hassle with the Law using Led's though... Other option is to paint your Aux lights yellow, just like your Dad did 20 years ago when you went on holiday to france..
Yellow doens't look cool... Buy it stands out.
P.