. Electrical news and engineering. aylight. This characteristic has been present throughoutthe centuries in which lighting sources have evolved fromthe torch to the incandescent electric lamp. The influenceon this characteristic is manifest in the red. brown, andamber tones which predominate in the decorations of roomsdesigned to appear at their best under artificial light. Thata light of this quality is essential to the prevailing colorschemes is evidenced by the frequent choice of amber coloredshades. On the other hand, an artificial illuminant whosecolor quality is approximately the same as
. Electrical news and engineering. aylight. This characteristic has been present throughoutthe centuries in which lighting sources have evolved fromthe torch to the incandescent electric lamp. The influenceon this characteristic is manifest in the red. brown, andamber tones which predominate in the decorations of roomsdesigned to appear at their best under artificial light. Thata light of this quality is essential to the prevailing colorschemes is evidenced by the frequent choice of amber coloredshades. On the other hand, an artificial illuminant whosecolor quality is approximately the same as natural daylightis welcomed by many as opening new possibilities in interiordecoration design. The Mazda C-2 lamp has the proper screening propertiesincorporated in the glass of the bulb. The excess of redand yellow rays of the light are absorbed while the blueand green rays arc permitted to pass through, thus a lightof afternoon sunlight quality is produced at an efficiencyabout equal to that of the Mazda B lamp. While the color. MAZOA C-ZFig. 1—Comparative color content of various lamps. quality of such a light is sufticiently near that of daylightto serve for general illumination, and from this standpoint isa decided improvement over the light emitted by the un-colored bulb lamps, it is not of the proper quality to permitextremely accurate color matching. Where an accurate dup-lication (jf north sky light is necessary, units employingMazda C lamps and properly designed color-screen plates •Engineering Department, National Lamp Works of General Electric( oniitany in tlu- Stalioi-;. should be used. The light from such units is of constantquality and therefore more dependable than the natural northsky light, which varies in quality from day to day. The diagrams in Fig. 1 show a comparison in primarycolor content of the light of carbon, Mazda B, Mazda C andMazda C-2 lamps. It will be seen that a very decided im-provement in the color quality of artificial light has
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