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When you see green and white lights on another boat, you should slow down. This means that you are approaching another boat and you should reduce your speed.
dark out
dark out
dark out
dark out
dark out
Green light - Green, White light - Green, Red light - Black
You get light green.
The green light would be the starboard steaming light, the white the masthead light. What you would do would depend on factors such as its releative bearing and in what waters you are sailing.
All around white light
You have to mix white and green to get light green.
Magenta coloured light makes white light when mixed with green light