http://www.lrc.rpi.edu/programs/solidstate/  - Lighting Research Center
http://www.iesna.org/   - Illuminating engineering society
http://www.darksky.org – International dark sky association
http://www.ledsmagazine.com/ - LEDs Magazine, the leading global information source for the LED lighting market.
http://light-building.messefrankfurt.com/frankfurt/en/besucher/willkommen.html - Light Building, leading fair in lighting industry
http://www.strategiesinlight.com/index.html  - Strategies in light, leading events for the global LED and lighting industry
http://www.sileurope.com/index.html - Strategies in Light, Europe

http://www.intertek.com/marks/etl/
http://www.ul.com/global/eng/pages/?noredirect

Useful links to additional studies

http://designlights.org/
http://www.lightingfacts.com/
http://www.jedec.org/
http://www.energystar.gov/