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Abstract

To determine the ratio of the luminous flux of high pressure mercury vapour lamps (HPMV) to the luminous flux of reference incandescent lamps, a set of 5 HPMV lamps with a clear bulb, 5 with a coated bulb and 5 incandescent lamps were circulated. Participants in this intercomparison were six laboratories and one industrial laboratory within the EC. The value of the luminous flux of one HPMV lamp can only be determined with an uncertainty of 5%. If the mean value of the luminous flux of 5 HPMV lamps is considered, the uncertainty can be reduced to 1%. The contributions to the total uncertainty (statistical behaviour of the lamps, a.c. power supply, or spectral evaluation of the light) are discussed. From the circulation of the incandescent lamps it could be separately concluded that the lumen (or candela) agreed within 0.5% between the participating laboratories.

Additional information

Authors: FOERSTE D, PHYSIKALISCH-TECHNISCHE BUNDESANSTALT, BRAUNSCHWEIG (GERMANY);SAUTER G PHYSIKALISCH-TECHNISCHE BUNDESANSTALT, BRAUNSCHWEIG (GERMANY), PHYSIKALISCH-TECHNISCHE BUNDESANSTALT, BRAUNSCHWEIG (GERMANY)
Bibliographic Reference: EUR 10574 EN (1986) FS, 95 P., BFR 350, EUROFFICE, LUXEMBOURG, POB 1003
Availability: Can be ordered online
Record Number: 1989124133500 / Last updated on: 1987-01-01
Category: PUBLICATION
Available languages: en
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