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Designing Light

Designing Light

The companion blog to the book Designing With Light

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Welcome to the companion web site for Jason Livingston's Designing With Light: The Art, Science, and Practice of Architectural Lighting Design.

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Designing With Light is available in English as a soft back book and as an ebook for Kindle, Nook, iBooks, and the Google Play Books app. It is also available in Simplified Chinese as a hard back book.

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You are browsing the Blog for Daylighting.

TM-30 and Daylight

August 6, 2018 in Daylighting

An architect recently emailed me asking if it was possible to use TM-30 metrics with daylight.  My short answer was something like, “I suppose you could, but why would you?”

The long answer is that all of the TM-30 measurements (Rf, Rg, the 16 chroma shifts, the 16 hue shifts) are relative – comparing the light source in question with the reference light source.  With daylight, you’d be comparing the daylight SPD you captured at a moment in time with the CIE definition of daylight at the same CCT.  On an average day I doubt that any of the measurements would deviate from 100 by more than a couple of points.  So, using TM-30 (or CRI Ra) is like measuring a ruler with another ruler.  You’re essentially comparing one thing to a definition of itself.

Tags: color rendering, CRI, TM-30
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Yes, Your Sleep Schedule is Making You Sick – The New York Times

March 10, 2017 in Daylighting, Health

Here’s an article from today’s New York Times that gives a good overview of the relationship between light, especially morning light, and physical and mental health.

Source: Yes, Your Sleep Schedule is Making You Sick – The New York Times

Tags: Light and Health
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About The Author

Jason Livingston IES, LC, LEED Green Associate is the principal of Studio T+L. In addition to his extensive design career, he has taught theatrical and architectural lighting design in New York City since 1993. He currently teaches architectural lighting design at Parsons The New School For Design and Pratt Institute.
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