I have seen several great examples of this before.. one evening, out of the blue, I decided to experience it myself. After looking up for the nearest location where I could commute, the industrial zone in Kawasaki seems to be the best choice (from where I live). Thanks to the precise google map and some available information on other photog's blog, I could pinpoint the locations of the plant accurately without wasting time to walk around in the dark. All photos were taken handheld with Summicron 35/2 ASPH and the results are quite satisfactory. Too bad that I didn't have much time to wander around and get more surrounding scenes (due to the train time timetable commuting back to central Tokyo). If you wanna have the exact location or know any good spot not too far from Tokyo, please drop me a line!