Interiors & Sources, Feb. 2014.
http://www.interiorsandsources.com/article-details/articleid/16887/title/versus-4-way-lighting.aspx

"Whether you’re working alone or with help, it’s important to understand the fundamental differences between these four most common lighting options currently on the market: incandescents, halogens, CFLs, and LEDs. Keep in mind that these are general guidelines, and may not apply to specialty fixtures or newer technologies. When in doubt, ask!"