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2018 AAAS Annual Meeting February 15 - 19, 2018Austin, TX

Radiosity methods assume that all surface materials have perfectly diffuse reflectance, i.e., they reflect light equally in all outgoing directions for all incident angles of incoming radiations.

One of the criticisms of the radiosity approach for daylight simulation is that it can only model diffuse reflections. Quoting IES RP-5-13, Recommended Practice for Daylighting Buildings (IES 2013):

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True – these color shifts are starkly evident, and would be completely unacceptable for retail and residential lighting. However, we need to remember that the topic of discussion is roadway lighting, specifically where municipalities are considering replacing high-pressure sodium (HPS) lamps with LED modules. With this, we need to look at the SPD of a typical HPS lamp (Figure 6).

The beauty of the von Kries transform, however, is that it enables us to mathematically predict the color shifts due to a given test illuminant. Given a set of test colors – the Gretag-Macbeth ™ is an obvious choice – we can predict and display what these colors will look like (e.g., Figure 5).

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Prior to attending law school, Mr. Meier worked as a computer hardware engineer at various large companies and start-ups including: Hewlett-Packard Company, STMicroeletronics, StarGen Inc., and Ambric Inc. He worked at Rockwell International, Cyrix Corporation, and Microsoft Research as an intern. Mr. Meier also held research and teaching assistant positions at the University of Washington and the University of Colorado. Prior to joining the firm, Mr. Meier worked as a law clerk at Mentor Graphics Corporation, Stoel Rives LLP, and Alleman Hall McCoy Russell & Tuttle LLP.

FIG. 1 – Horticultural lighting in greenhouses. (Source: Colorado State University)

“This element has been left open for use with other photometry definitions. Photometric data is required for various forms of lighting analysis. This tag provides a way for the photometric data to be passed. Since this can be done in a variety of ways (iesna LM-63, cibse TM14, ELUMDAT, etc.) a specific format is not being specified.”

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Biochemically, phytochrome is a with a .


FIG. 3 – Lumileds SunPlus 20 Deep Red

The aurea(au) and yellow-green-2(yg-2) mutants of tomato (Solanum lycopersicum L.) are unable to synthesize the linear tetrapyrrole chromophore of phytochrome, resulting in plants with a yellow-green phenotype. To understand the basis of this phenotype, we investigated the consequences of the au andyg-2 mutations on tetrapyrrole metabolism. Dark-grown seedlings of both mutants have reduced levels of protochlorophyllide (Pchlide) due to an inhibition of Pchlide synthesis. Feeding experiments with the tetrapyrrole precursor 5-aminolevulinic acid (ALA) demonstrate that the pathway between ALA and Pchlide is intact inau and yg-2 and suggest that the reduction in Pchlide is a result of the inhibition of ALA synthesis. This inhibition was independent of any deficiency in seed phytochrome, and experiments using an iron chelator to block heme synthesis demonstrated that both mutations inhibited the degradation of the physiologically active heme pool, suggesting that the reduction in Pchlide synthesis is a consequence of feedback inhibition by heme. We discuss the significance of these results in understanding the chlorophyll-deficient phenotype of the au andyg-2 mutants.

FIG. 4 – Lumileds SunPlus 20 Far Red

The advantage of gbXML is that it is based on the international data exchange standard (eXtensible Markup Language)15. The details of this standard are complex and exhausting, but basically every XML document consists of text strings called “elements” such as:

Or you can make a one-time payment via :

Unfortunately for lighting design professionals, the gbXML schema has an XML “element” (see below) called “Photometry,” whose description reads:

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Building on this simplest of representations, virtually any type of data can be unambiguously represented within an XML document. If a person or computer program reading an XML document encounters an unknown element tag, the element and its children (if any) can simply be ignored.

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This, of course, is the problem with including LM-63 or EULUMDAT text files verbatim (i.e., as a multiline text string) within gbXML or similar BIM documents. Yes, it can be done, but the computer program reading the document needs to be able to somehow identify and read these files. Designing IES TM-xx as an XML document resolves this problem.

FIG. 1 – Howdy Doody, NBC television star (1947 – 1960)

Physics: “Oscillations. Springs and pendulums”. Oscillations. Simple harmonic motion. Horizontal springs. Pendulums. Vertical springs. Amplitude, period, frequency, and angular frequency

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