Since Mercury Vapor and coated Metal Halide lamps seem to come out green on my digital camera,
I was toying around with my pictures of those from Boston and Holbrook in Microsoft Picture It! 2002 edition and I found a way.
Read the description and you'll learn how I managed to edit green out of Mercury Vapor lamps on camera.
http://www.angelfire.com/planet/tpirman1982/Mercury_Vapor_Edits.html