Mercalli intensity scale | Luminous efficacy | High intensity training | High-intensity interval training | High-intensity discharge lamp | The Luminous Fairies and Mothra | Luminous red nova | High Intensity Drug Trafficking Area | Capital intensity |
He is largely remembered for the invention of the Hefner lamp, which provided the measure of luminous intensity used in Germany, Austria and Scandinavia from 1890 to 1942.