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Methods for improving colour rendering - Part 3
Another part of our series on improving colour rendering has been published in Světlo magazine. The third part focuses on monochromatic radiations and their combinations. Can monochromatic radiation have a chromaticity temperature? What color rendition can be achieved by combining two monochromatic radiations? Find the answers in the online article. Author. Antonín Fuksa NASLI & Blue stepPublished in Světlo 6/2021
Plants and light in a biophilic interior
The final - seventeenth - part of the series "Plants and Light in Biophilic Interiors" by Ing. Stanislav Haš, CSc. (1931-2020) et al. Ing. Fuksa from NASLI co-authored the first parts of the series and editorially completed the works in progress after the departure of the main author. The individual parts of the series are available on the website of the journal Světlo and also via our signpost. Z [...]
Methods for improving colour rendering - Part 2
The first part of this miniseries (see Light 1/2020, pages 16-17) demonstrated increasing the general color rendering index of a white LED by adding one or two colored LEDs. This part explores improving the Ra of light sources by using a filter that, in turn, attenuates the appropriate spectral region. The experiment again uses the method of shifting a Gaussian curve across the entire visible spectrum, but here the [...]
Methods for improving colour rendering - Part 1
This article draws inspiration from less common practices that some light source and luminaire manufacturers use to improve the general colour rendering index (Ra according to [1]). Although these methods have pitfalls and some can be considered tricks, it is worth exploring them in more detail using algorithms for calculating colour rendering indices. The idea for this experiment was [...]
Light for the elderly
The non-visual effects of light - We shine not only to see
Light allows us to see, but its effect is far from over. Already in his habilitation thesis in 1948, Dr. Hollwich, a well-known German ophthalmologist and author of textbooks on ophthalmology, distinguished between the visual and the energetic (non-visual) transmission path of light. [1] The visual effects of light are well known, and there are three types of cones for colour day vision: blue (S) [...]
