• Is that bulb completely directional?

    Yes, or at least i think so. It looks like an LED MR16 lamp. Why the fuck you want to shine it at a mirror is beyond me. On the off chance you don't get direct glare as you walk anywhere near it you can rest assured when you sit down you'll have a bright light source reflected back in your face.

  • You can adjust the height of the light source and those bulbs have a beam angle as narrow as 10°, usually around 40°, getting it glare-free seems trivial.
    Mirrors, either glass or polished metal, work fairly well for reading lamps, see Castiglioni's Gibigiana.

    This one seems to use some sort of coated specialty glass.

    https://vimeo.com/242368762

  • With a visible light source and sharp cut off lines it's not gonna make a great reading light IMO.

    As an interesting looking piece of furniture it works well.

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