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Luminous flux of fluorescent tubular lamps

Objective



Because of the size and shape of these lamps, the luminous flux is more difficult to measure than spherical lamps.
Four types of tubular lamps with lengths ranging from 60 cm to 1.50 m are circulated together with incandescent lamps which serve as reference.

RESULTS

Excellent agreement (about 1%) was obtained by the two laboratories which use the goniophotometer for the measurement of the luminous flux.

Even though the results of some laboratories appeared to be affected by systematic errors related to spectral distribution, length of the tube and distortions in the power supply, they were consistent with the stated uncertainties, and in no case differed by more than 5%. The results of the intercomparison should lead to the revision of the instrumentation and the procedures used in order to reduce disagreement. The intercomparison has, on the whole, managed to provide traceability to the photometric standards maintained at BIPM, IEN, NPL and PTB.

Funding Scheme

CSC - Cost-sharing contracts

Coordinator

British Standards Institution (BSI)

Participants (10)

General Electric Company plc
United Kingdom
Address
Hirst Research Centre
Istituto Elettrotecnico Nazionale Galileo Ferraris
Italy
Laboratoire Central d'Electricite
Belgium
Lysteknisk Laboratorium
Denmark
National Physical Laboratory (NPL)
United Kingdom
Address
Queen's Road
TW11 0LW Teddington
Nederlandse Philips Bedrijven B.V.
Netherlands
OSRAM GMBH
Germany
Address
Hellabrunnerstrasse 1
81543 Muenchen
PHYSIKALISCH-TECHNISCHE BUNDESANSTALT
Germany
Address
Bundesallee 100
Braunschweig
Philips Gloeilampenfabrieken
Netherlands
Thorn EMI Lighting Ltd
United Kingdom
Address
4 Tenterton Street
W1R 9A London