arc aaa is only a nichia, the kl1 will completely obliterate it!
the arc ls-p however, has a good chance of beating the kl1 in terms of brightness however, because the premium uses top-notch luxeons, the kl1 is still luck of the draw.
if you are thinking about carrying the kl2 (or arc ls for that matter) with your aaa, then great! if you were referring to the ls, then i would suggest another additionaly light, as the arc ls and the kl1 are quite close in terms of light output.