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2 Replaced "orbit" tag with more suitable "observation" one (the question is not about the ISS's orbit).
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Why does the International Space Station have a downward facing light?

I really enjoy watching the International Space Station fly over head. I subscribe to alerts so I know when it is in my area during the night time. I wouldn't be able to see it if it weren't for the light. Perhaps the light is only so we can see it more easily. I'm not exactly sure why there is a light on it and I've searched for answers.

Why is there a light on the International Space Station facing us on Earth?

It's a very bright white light. It's not a blinking light for collision avoidance. It uses power, maybe not a lot but still a consideration.