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I'm watching the live TV from NASA broadcasting the ISS / SpaceX Dragon docking and I've seen a red light and a white flashing light. See them at the bottom of this image

screenshot from NASA live TV.

What are they for?

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    $\begingroup$ Navigation lights. If you see a spaceship the red/green split, and white tail mast tells you direction it is going. (Making a bad boating joke here). $\endgroup$
    – geoffc
    Commented Aug 16, 2017 at 13:14

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Navigation lights. Red on port, green on starboard, white on top, and yellow on bottom. The white light is also usually used as a tracking light from distance.

https://en.wikipedia.org/wiki/Navigation_light

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    $\begingroup$ Really? Red/Green/white? Just like a boat! I was joking earlier! Yellow for the bottom that is not useful on a boat. Cool. $\endgroup$
    – geoffc
    Commented Aug 16, 2017 at 23:03
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    $\begingroup$ @geoffc -- And just like an airplane. The similarity is intentional, as are the terms docking and berthing. $\endgroup$
    – David Hammen
    Commented Aug 17, 2017 at 3:03

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