THE property possessed by certain discharges of radiating relatively large proportions of their energy in the visible part of the spectrum is well known. Thus efficiencies of the order of 50–70 lumens per watt are obtained from high pressure mercury vapour and sodium vapour discharges.
Fluorescent Lighting
Aircraft Engineering and Aerospace Technology ; 14 , 4 ; 112-116
01.04.1942
5 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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