Book excerpt: Held every three years, The International Symposia on the Science and Technology of Light Sources (LS) provide a unique forum for the international community of engineers, scientists, research organizations, and academia from the lighting industry. In Light Sources 2004, leaders in their respective fields discuss the latest findings and exciting developments in light source research. Contributors provide valuable analyses and discussions on topics such as incandescent and halogen sources, fluorescent discharge sources, lamp-related electronic gear, high intensity discharge sources, diagnostics, solid state sources, modeling, dielectric barrier sources, excimer devices, and nonlighting applications.