Hong Kong, Tokyo, London, New York—San Francisco. That's right, with no shortage of world-class light installations, SF holds more than a candle to the globe's most important art cities in the digital age.

And when light, natural or not, is used as an artistic medium, all kinds of uploadable, no-filter-needed joy ensues.

Even when Karl the Fog comes rolling in, our city by the sea can't help but be aglow with dozens of delightful light art installations. Some play off the natural light that cuts through the overcast skies come high noon; others take advantage of an absence of light, utilizing LEDs and fluorescent tubings to transform otherwise dark spaces.

Here are 18 luminous artwork that will brighten up your night.