I don't have my Tillandsia yet because I'm still in the research/see-if-I-can-talk-myself-out-of-yet-another-plant phase. But in my research I've come across a lot of useful information about growing these plants.
Mr Loeb was no art neophyte. His parents collected French and Italian pictures, and he already had a collection of German Expressionists. Impressed by Danish art, he started buying. The four paintings by Hammershoi in Luminous Modernism are from the important Danish art collection he built.
Luminous emittance is a deprecated term for Luminous Exitance. (Terms of photometry). Luminous flux density is photometrically weighted radiant flux density, which means luminous flux per unit area at a point on a surface where the surface can be real or imaginary.