Lightforum.com: Resource center for the lighting community with lighting projects, articles and a discussion forum.
Lighting-Linx: Information about the lighting industry, with a database to search companies and products.
Lighting.com: Portal for lighting professionals with searchable listings of vendors, discussion forum and lighting industry news.
Lightsearch.com: Searchable directory of lighting sites.
The LightNetwork: An online community for theater lighting professionals and students with news and discussion forums.