Are there efficient alternatives to halogen track lighting?

If you’d asked this question a mere year or two ago, the answer would have been: no, there really aren’t energy-efficient alternatives to halogen track lighting, at least not for residential or small commercial applications. There are fluorescent track fixtures, some quite nice, but they are usually for a different sort of lighting -- wide spread or wall washing -- than the more directed, focused lighting that halogen offers.
Since then there’s been a rapid growth in

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