Where I should look for for the energy distribution of commercially available sources?
This is a great question. There are really only two sources. Many of the manufacturers will publish nominal spectral power distributions for their light sources. Sometimes you can even find these specs on the internet, but you should be able to get them by making a request directly to the manufacturer. The second option is to measure sources yourself. That’s expensive and time consuming, but will actually provide more useful results for real-world settings. I believe the CIE did a measurements of a lot of real fluorescent light sources to create the newer F illuminants in publication 15:2004.
