range light
noun nautical
one of a pattern of navigation lights, usually fixed ashore, used by vessels for manoeuvring in narrow channels at night
one of a distinctive pattern of lights shown at night on the masts of a powered vessel, such as a tugboat, to aid in identifying its size, number of barges in tow, etc
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
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Examples from the Web for range light
Historical Examples of range light
The range-light emits light toward all points of the compass and must be intense enough to be seen at a distance of three miles.
Artificial LightM. Luckiesh