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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.

Funding Scheme

CSC - Cost-sharing contracts

Coordinator

British Standards Institution (BSI)

Participants (14)

Constructions Electriques Schreder
Belgium
General Electric Company plc
United Kingdom
Address
Hirst Research Centre
General Electric Company plc
United Kingdom
Instituto di Optica
Spain
Istituto Elettrotecnico Nazionale Galileo Ferraris
Italy
Keuring van Elektrotechnische Materialen
Netherlands
Laboratoire Central d'Electricite
Belgium
Laboratoire Central des Industries Electriques
France
Address
33 Avenue Du Général Leclerc
92260 Fontenay-aux-roses
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
Thorn EMI Lighting Ltd
United Kingdom
Address
4 Tenterton Street
W1R 9A London