When I was 10 or 11, I had access to the head from a streetlight who's pole got nocked over not far from the bridge in Juneau AK., but my dad and stepmpther would have strongly objected, so I ended up having to leave it be.
Hopefully, another flashaholic retrieved it before it was hauled to the city dump. /ubbthreads/images/graemlins/frown.gif
The streetlight fixture in the above photograph looks like it uses a mogul screw base bulb; probably a 400 watt metal vapour bulb like yuandrew said. I don't see a ballast (a very large and heavy iron core transformer), so finding the correct bulb may be of little use in this case.
Oh, and please don't put it on your commode to use as a gigantic toliet seat. /ubbthreads/images/graemlins/icon15.gif /ubbthreads/images/graemlins/eek.gif /ubbthreads/images/graemlins/icon15.gif