Daylight efficiency of artificial illuminants . WASHINGTON GOVERNMENT PRINTING OFFICE 1910 National Bureau of StandardsSEP 2 1952 QCl • US DAYLIGHT EFFICIENCY OF ARTIFICIAL ILLUMINANTS. By Herbert E. Ives. Among students of illumination it is generally agreed that thebest light for human use is daylight. Therefore the nearer anartificial light approaches daylight in color and distribution, thehigher it should rank. There has been developed, however, nosimple means of measuring an artificial light source in such amanner that a numerical value can be given to its approach inquality to daylight.
Daylight efficiency of artificial illuminants . WASHINGTON GOVERNMENT PRINTING OFFICE 1910 National Bureau of StandardsSEP 2 1952 QCl • US DAYLIGHT EFFICIENCY OF ARTIFICIAL ILLUMINANTS. By Herbert E. Ives. Among students of illumination it is generally agreed that thebest light for human use is daylight. Therefore the nearer anartificial light approaches daylight in color and distribution, thehigher it should rank. There has been developed, however, nosimple means of measuring an artificial light source in such amanner that a numerical value can be given to its approach inquality to daylight. In other words, there has been no basis forestimating the daylight efficiency. In so far as color is concerned, progress has recently been madealong two lines which should make possible and profitable anattempt to supply this deficiency. On the side of physical researchextended series of spectrophotometric measurements of daylighthave been made, notably by E. L. Nichols. On the technicalside there have been developed new illuminants of highdayl62312461909125125unse
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