Watts the Difference between Lumens, Watts, and Kelvin?
Why does °c/watt equal °k/w? - Quora
hofstein Deckenleuchte »»Piani«, moderne Deckenlampe aus Metall in Schwarz/Weiß/Goldfarben, Lampe mit Stoffschirm, 2100 Lumen, 3000 Kelvin, 24 Watt (inkl)«
Why doesn't the unit for thermal conductivity, watts per meter per Kelvin, include the perpendicular unit of area through which the heat energy flows? - Quora