This is an alternate version of the photograph I posted here on Tuesday (http://audiidudii.aminus3.com/image/2011-05-03.html). In fact, this was my first exposure of this scene, although it wasn't the scene I was intending to photograph. That is because the second light lighting this parking lot suddenly blinked out, literally as I opened the shutter for what I'd intended to be a 15-second exposure. Once I saw how much darker the scene became without the second light, though, I decided to leave the shutter open for 35 seconds longer (I was using the "bulb" mode with a cable release, so the shutter would remain open until I manually closed it), wagging a guess based upon experience that 50 seconds would be about correct.
In retrospect, another 5-10 seconds of exposure would have been better, but before I could get a second exposure off, the recalcitrant light blinked back on and I was back to where I had started approximately two minutes earlier.