I think this slide does a good job breaking things down so we remember terms based on what is physically happening.
So would radiant energy be considered the least amount of information and radiant flux density be considered the most amount of information?
@IntelligentDungBeetle Yes, at least as far as this slide is concerned. Later in this lecture we break light down further and further until we have spectral radiance, which captures basically everything you could possibly want to know. (At least according to geometric optics.)