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Luminous flux of high pressure sodium lamps

Objective



The project is very similar to the project on high pressure mercury lamps. This had shown discrepancies between the participants and because of the commercial importance of sodium lamps it was considered important to verify that the luminous flux can be measured correctly.
Each participant was requested to carry out the measurements on four high pressure sodium lamps and four incandescent lamps.

RESULTS

A standard deviation of 0.64% was observed between eight of the laboratories involved. This result can be considered satisfactory in view of the poor stability and variations frequently found among production lamps. The work carried out should enable the other laboratories to identify errors in their measurements and correct them in the future.

Topic(s)

Data not available

Call for proposal

Data not available

Coordinator

British Standards Institution (BSI)
Links

Participants (14)

Constructions Electriques Schreder
Belgium
Links
General Electric Company plc
United Kingdom
Address
Hirst Research Centre

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General Electric Company plc
United Kingdom
Links
Instituto di Optica
Spain
Links
Istituto Elettrotecnico Nazionale Galileo Ferraris
Italy
Links
Keuring van Elektrotechnische Materialen
Netherlands
Links
Laboratoire Central d'Electricite
Belgium
Links
Laboratoire Central des Industries Electriques
France
Address
33 Avenue Du Général Leclerc
92260 Fontenay-aux-roses

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Lysteknisk Laboratorium
Denmark
Links
National Physical Laboratory (NPL)
United Kingdom
Address
Queen's Road
TW11 0LW Teddington

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Nederlandse Philips Bedrijven B.V.
Netherlands
Links
OSRAM GMBH
Germany
Address
Hellabrunnerstrasse 1
81543 Muenchen

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PHYSIKALISCH-TECHNISCHE BUNDESANSTALT
Germany
Address
Bundesallee 100
Braunschweig

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Thorn EMI Lighting Ltd
United Kingdom
Address
4 Tenterton Street
W1R 9A London

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