A light pillar is caused by the reflection of light from ice crystals that have near horizontal parallel surfaces. The reflected light usually comes from the sun when it is low in the horizon; the light can also come from the moon or from other sources of light such as streetlights.
Light pillars are caused by light from ice crystals that reflects near horizontal parallel planar surfaces. The light can come from either the sun or the moon. It can come from sources of light on Earth too though. Streetlights are one of these sources.
Here is an image of light pillars in Alaska:
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