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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.
jono84-
mirror
Is there a reason everyone is so sure that it is a mirror?
On first look I assumed it was glass, and the reflection of that little bit of string is just reflection you'd get with a normalish glass (there is nothing else, like the sofa showing). The angle of normal glass would give a bit of directional light reflection as well as refracting the light upwards - which based on the bulb is what I assumed the main purpose is.
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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
hugo7
gertrudestein
Is that bulb completely directional? Otherwise it would be rather harsh at standing height, maybe even if it is.
I went through a bare bulb phase, I like lampshades now.