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The city of Kyoto witnessed Japan's first public-owned electric utility and first hydraulic station for general supply, and was the first Japanese city in which every household became electrified. Behind these achievements, the interaction between the privately owned Kyoto Electric Light Company and the government-owned Kyoto Municipal Electric Works were important. By exploring their origin, collusion, competition, and demarcation between them from 1887 to 1915, this article addresses business–government relations in the history of Japanese electrification through the case of Kyoto.

The current scenario of colorimetry shows a wide variety of different metrics which do not converge in the assessment of the color rendering of light sources. The limitations of the Color Rendering Index have promoted the emergence of new metrics, such as the Color Quality Scale. As in the case of the previous metric, these new concepts are based on the analysis of the deviation of different color samples in a color space, contrasting the results with those obtained with a light source reference, which can vary depending on the color temperature. Within this context, the Daylight Spectrum Index is proposed. This new concept aims to determine the affinity with daylighting of electric light sources, comparing the resulting spectral power distributions of the lamps studied and that observed under natural light. The affinity of an electric light source with daylighting allows for lower energy consumption due to the better performance of human vision. The new metric proposed is evaluated following the results obtained from 80 surveys, demonstrating the usefulness of this new concept in the quantification of color rendering of LED lamps and the affinity of electric light sources with daylighting. ; Government of Spain BIA2017-86997-R

This article introduces the concept of "digital light" into the Russian-language space of media theory, and also offers its conceptualization as a distributed network medium that transforms cultural practices. The article substantiates the need to distinguish digital light as a separate concept. Unlike the concept of "electric light" introduced by McLuhan, the content of the concept of "digital light" is based on the constructive and physical features of this medium, and not on abstract ideas about "pure information". This article describes the media properties of digital light, determined by its semiconductor structure and the property of sampling the electrical signal. It substantiates the productivity of considering these structures in the context of a broad concept of digital light, rather than individual technological forms or software solutions. Considered not as a separate technological form, like a light bulb or a screen, but as covering the entire set of radiating and controlling means, and as a dynamic developing network, the elements of which can be both visible to a person and invisible to him (as a part of the infrastructure), digital light creates various situations of multi-channel exchange of electrical signals, eliminating the boundaries between its own digital structure and the illuminated objects of the environment. In particular, digital light allows interactive digital installations to exist and can process and visualize big data in real time. Digital light, understood in this way, turns out to be a medium with its own "message", which overcomes McLuhan's claim of electric light as a "medium without a message".

At head of title: The Commonwealth of Massachusetts. Board of Gas and Electric Light Commissioners. ; Mode of access: Internet.