http://americanhistory.si.edu/lighting/history/patents/frid1.htm
Some of the history of the halogen light bulb
http://www.energystar.gov/index.cfm?c=lighting.pr_what_are
Basics on LED light bulbs
http://www.lightingprize.org/
Tells of competition for solid state lighting products and one of its winners, which features an LED product. May or may not be useful.
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