LXXXI. The luminous efficiency of the high pressure mercury vapour discharge

Francis, V.J.; Isaacs, G.G.; Nelson, E.H.

doi:10.1080/14786444608521570

Cited by 3 publications

(2 citation statements)

References 3 publications

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“…It will be seen that there is an apparent upper limit to the 54 suggest that, in fact, this limit should be at about 85 lumens/watt. Lamps at present on the market have luminous efficiencies of between 40 and 50 lumens/watt and it is natural to ask whether it is likely that these high efficiencies can «ver be obtained in practical lamps.…”

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confidence: 92%

The high-pressure mercury-vapour discharge and its applications

Francis¹,

Stevens²

1947

Journal of the Institution of Electrical Engineers - Part II: Power Engineering

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After a brief review of the development of high-pressure mercuryvapour lamps and their applications, the present position is considered, both as regards the understanding of the properties of the discharge itself and the applications to lighting. Some attempt is made to examine the ultimate possibilities of the discharge from the point of view of efficiency and colour. Present applications are discussed, and the demand that future applications are likely to make on lamp design are considered. 00) = /* : == P I V %•a •-P

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confidence: 92%

The high-pressure mercury-vapour discharge and its applications

Francis¹,

Stevens²

1947

Journal of the Institution of Electrical Engineers - Part II: Power Engineering

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“…In this way the limitations of power loading, imposed by the softening point of the material used for the envelope, are effectively removed, and then a range of pressures and power loadings of the arc column may be investigated which would otherwise be' impracticable. Exploration of this region by such means has shown that much higher luminous efficiencies are possible than was thought to be the case (8). At pressures of some 5 atmospheres or more, the variation of luminous efficiency with pressure is small provided the power input to the arc is maintained constant; accordingly the luminous efficiency is a function only of the latter.…”

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confidence: 97%

Air-Cooled High Intensity High Pressure Mercury Vapour Lamps

Francis¹

1950

Transactions of the Illuminating Engineering Society

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During and since the war there have been important developments in high pressure mercury vapour lamps. As a result much more is now known of the properties of lamps with high power loading per centimetre of arc than was the case ten years ago. As well as significant progress with small source high brightness lamps proper, there has emerged intermediate betweerr these and the older tubular lamps a design of lamp yith luminous efficiencies greater than those previously obtainable.. Useful progress has been made also with the colour rendering properties and new applications are in consequence being found.

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Design Principles Relating to Lamps and Artificial Lighting

1993

Studies in Inorganic Chemistry

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LXXXI. The luminous efficiency of the high pressure mercury vapour discharge

Cited by 3 publications

References 3 publications

The high-pressure mercury-vapour discharge and its applications

The high-pressure mercury-vapour discharge and its applications

Air-Cooled High Intensity High Pressure Mercury Vapour Lamps

Design Principles Relating to Lamps and Artificial Lighting

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