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light, e.g. "W" for white, "G" for green, "R" for red, "Y" for yellow, "Bu" for blue. If no color is given, a white light is generally implied.
* The cycle period, e.g. "10s" for ten seconds.
* Additional parameters are sometimes added:
:* The height of the light above the chart datum for height (usually based on high water). e.g. "15m" for 15 metres.
:* The range in which the light is visible, e.g. "10M" for 10 nautical miles.

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