A Model for the High Pressure Sodium Lamp Characteristic Curve

Strok, J.M.

doi:10.1080/00994480.1991.10748925

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Lamp Efficacy Model1

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1992

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Cited by 5 publications

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“…The wall thickness and geometric end loss factors in equation 6 are fixed by the arc tube construction. Secondly, a previous paper (9) showed that the electric field is described by A exp( -b /7J over ranges of bore size, amalgam composition, and cold-spot temperature which span most of the design space for commercial HPS products. The value of ~9 depends upon the bore size and amalgam Na/Hg ratio, but the value of b may be considered constant.…”

Section: Lamp Efficacy Modelmentioning

confidence: 99%

High-pressure sodium lamps: Practical design model

Strok

1992

Lighting Research & Technology

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A model is presented which predicts HPS lamp efficacy to within about 5 1m W -1 over a wide span of design space. When the input wattage is fixed and the cold-spot temperature of standard colour HPS arc tubes is varied, a universal curve of normalised lamp efficacy versus relative electric field is followed. The curve peaks where the spectral power distribution is optimum for luminous efficacy. Published lumen ratings and physical measurements were used to determine an arc thermal conduction loss of 6.6 & p l u s m n ; 0.5 W cm -1 for commercially available products.

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Section: Lamp Efficacy Modelmentioning

confidence: 99%