| dc.description |
The results are presented of an international comparison of the SI photometric base unit, the candela, as realized and maintained at the National Physical Laboratory (NPL, UK) and the Metrology Research Institute at Helsinki University of Technology (HUT, Finland). Both laboratories base their luminous intensity units on absolutely calibrated photometers and these, as well as the more traditional transfer standard lamps, were used for the comparison. The results show that the units established and maintained at the two laboratories agree to well within the expanded uncertainty. |
