Well here is a lighting history question for all of you lighting professionals. I'm working on some research dealing with lighting in the theatre before the use of the current tungsten-halogen lamp that we commonly use today. I know the topic is really broad, and I'm working on narrowing it down to a more specific area, but does anyone have any suggestions for places i could look at to get get more information. Books, Websites, Videos, etc would be great! Since the topic is so broad I've been lately concentrating on the use of gas lighting in early theatre's. Any suggestions for sources for more information? I'm not concentrating on types of early instruments but rather types of lamps used. Although i understand that the type of lamp used would dictate the instrument type, so I'm open to instrumentation information also but that is not my main focus. Thanks for the Help!!