Originally posted by Dr. Calohandre 
does the wire still glow if the glass is broken? Could make an interesting shot as well.It would be dangerous to do that because it would live. However, I have shot some with the glass still in place. I used a table lamp with a small in-line diffuser control (you can get them in electrical shops) to lower the power level.
The light that is blue by http://www.flickr.com/people/carregwenimages/on Flickr
Red light district by http://www.flickr.com/people/carregwenimages/on Flickr