Identification of signal lights:
Various light signs are distinguished by different light qualities. Light quality includes light color, light rhythm and light cycle.
1. Light color
It's the color of the light. There are four common colors: white, red, green, and yellow.
2. Lighting rhythm
It refers to the periodic light and dark law of light. Such as fixed light, flash, combined flash, light and dark light, combined light and dark light, equal interval light, mutual flash, interconnected flash, mutual light and dark light, long flash, short flash, fast flash, fast flash, very fast flash, very fast flash , Morse lighting, etc.
3. Lighting cycle
Refers to the rhythmic light, the time interval that elapses from the start until it repeats at the same rhythm. The unit is seconds.
4. Recognition of light symbols on charts
If the lighthouse flashes white and red for 15 seconds at 50 meters and 18 nautical miles, it means that the lighthouse has two colors of flashing, white and red, with a flash period of 15 seconds. The lighthouse is 50 meters high and has a light range of 18 nautical miles.
