My mate has an XT660 - I should have been specific in asking:-
a) Will it fit the BMW fitting and
b) Has it made any diference
............which is what I wanted to know before trying to fit it on my own bike.
Gunz - I hear you, I was thinking HID but wondered if these were comparable (since web hype says 80%) - thanks for the feedback - at 20% increase I don't think they would be a HID competitor so I think I'll still go for the HID's.
Thanks