JOURNAL OF THE ILLUMINATING ENGINEERING INSTITUTE OF JAPAN
Online ISSN : 1349-838X
Print ISSN : 0019-2341
ISSN-L : 0019-2341
Helios versus Luminance
A Overview of Historical Development of Illumination Engineering
Takashi Higo
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1997 Volume 81 Issue 5 Pages 446-448

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Abstract

A discussion of the relationship between helios and luminance showes that helios has the same concept of luminance.
To date helios, the photometric concept is introduced to the photometric system on the basis of a surface light souce by P. Moon, has been misunderstood for a long time.

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