Abstract
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 between these and the older tubular lamps a design of lamp with 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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