Here are some sites that deal with plant lighting, hopefully they will help you-these are not hard to find though and if you type in your questions to a search engine you should be able to get more results if these are not what you are looking for:
http://www.bio.net/bionet/mm/plantbio/1 ... 03008.html
http://www.bio.net/bionet/mm/plantbio/1 ... 03021.html
http://iubio.bio.indiana.edu:7131/bione ... 03030.html
http://cals.arizona.edu/pubs/garden/mg/ ... ental.html
In response to some of your earlier questions [I am not a botanist but have studied plant biology]:
â€¢ You should probably test 2-3 plants for each light color. When doing experiments more is always better, because it will give you a more accurate answer.
â€¢ I am not sure if the hydroponic industry uses light, but this could probably be answered through a search engine. However, when observing your plants you should note that the plants that have grown to be bigger are simply growing faster than others. In looking at plant growth rather than development, bigger = the plant is growing faster. If you follow-up by looking at plant development, then you would want to look for bigger plants with more leaves, longer stems, etc.
Hope this helps! Please come back with any questions-good luck!