High-pressure mercury vapor (HPMV) lamps were studied in their color appearance and color rendition to obtain appropriate properties to be introduced to the general indoor lighting.
The general color rendering index in this type of lamps was examined and it was realized that the blue-green emitting phosphors were effective to raise the index when combined with the current red emitting phosphors.
A series of new Ba-Mg-aluminate phosphors was developed and this proved to be suitable for application to HPMV lamps. These phosphors have two emission bands having peaks at 450 and 520nm, and maintain high efficacy at elevated temperature.
The color appearance and the appearance of human complexion were optimized mainly through subjective estimations of various test lamps.
Basing on the estimation results, the final lamps were designed to the color temperature of 4200 K and DUV of+4.0 (the deviation from blackbody locus). These lamps seemed suitable to the general indoor lighting, they go well with standard fluorescent lamps or natural daylight. The distinctive feature of this new type of lamps is in its temperate appearance.
In order to appreciate the feature prorerly, a new view point is also suggested, viz. the numerical evaluation of color rendering properties of this kind of lamps.
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