Robuta

https://www.nist.gov/publications/recheck-lamps-used-intercomparisons-standards-luminous-intensity-2042-degrees-k-made
lampsusedstandardsluminous
https://www.nist.gov/publications/report-luminous-intensity-8-lamps-and-luminous-flux-8-lamps-used-intercomparisons-made
on theluminous intensityreportlamps