The Busch & Müller Ixon is an oldie but a goodie. This light has been on the market at least a couple of years, which is eons in the fast-paced world of bike lighting, but it still has some characteristics that makes it an excellent choice as a secondary bike light.
My ideal light set-up is a bright, focused-beam light mounted low on the bike (around mid-fork) to highlight debris and reach down the road, and a secondary light with a wider beam and more spill mounted on the handlebars to supplement the main light and improve visibility to motorists. The old Ixon, with its large reflector, wide beam, forward facing emitter, and gobs of side spill, serves this latter function perfectly. It’s pretty expensive to be used as a secondary “be seen” headlight, but the Ixon is a bit of a rarity amongst the new crop of inexpensive LED lights, many of which are designed with tight beams to put a bright, focused patch of light on the road surface. These new tight-beamed headlights are certainly good at laying down an intense patch of light, but they don’t do nearly as good a job as the old Ixon at announcing your presence to other road users.