Quecksilber-hochdruckleuehtstofflampen niedriger Farbtemperatur und erhöhter Lichtausbeute.

For the lighting of interiors as well as street lighting high pressure lamps with lower colour temperature were wanted, This could be obtained with a thicker fluorescent layer, which gives however a loss of luminous flux of 10%. By the use of Yttrium-vanadium of profit of luminous flux of 16% can be obtained. This new lamps with a more agreeable colour are better fitted for public lighting.