I just saw a window with a very prominent red light  displayed in my apt complex in Henederson, NV just outside of VEGAS.

Is that a signal that they are working?

How should i go forward?

Thanks for the help!

I think Sting was referring to another city, but maybe Henderson, NV is the same as Amsterdam? I just don't know......

A "Red Light" is the traditional signal for a" house of ill-repute" .  I saw a very obvious red light used at the Nevada Brothel I visited once.  

But the need for discretion would keep ladies from using such a signal.  Its best to keep things looking like every other apartment (or house) in the area.

I guess all you have to do is see who lives there and just be a good neighbor by letting them know they left the light on. "red light" and see how they take it. You never know how they will answer the door. Maybe a good invitation of what you are seeking or maybe it is just a red light that they like to display. Don't let your imagination take you to places that might get you in trouble.