Unusual flat-beam "window sill" light

An unusual light that puts out a flat beam in all directions. It is apparently intended for mounting on windowsills to create a beam of light around a whole window bay from a single point, but is also frequently shown in Ali/eBay listings in corridors creating a series of tunnels of light.

Although the beam of light does diverge fairly rapidly over distance it is still tight enough to create very nice laser-like effects with a light fog swirling through it.

Here's the AliExpress listing I bought it from, but there are also many other listings and styles.
https://www.aliexpress.com/item/1005001438047975.html
Guide price - around £20.

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