I'd always thought bars had strong, direct above lighting, so one would be perfect for this day's prompt.
I usually never go into bars and I was actually pretty dissapointed by how diffuse the light really was. There was a bunch of color differences but not a lot of value. (For example, faces lit by red on one side and green on the other, but kind of medium in tone all the way through).
I found I had to do some fudging and I'm afraid they came out a little vague. But the light above the pool tables was pretty good.
It was fun to draw people playing pool too, as they tend to freeze for a couple of seconds while aiming.
(And by the way, I had chili and lemonade, so no violation of our rule...)