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From "My Workbench" page ...

March 14 2018 at 12:40 AM

Paul Budzik  (Login P_Budzik)
HyperScale Forums
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Response to Modelling lights...which is the best light temperature..?

I always use a combination lamp over my work surface, Fig. 2. (The image in the glass was done for effect) Overhead, I use fluorescent tubes, Fig. 3. The key to fluorescents are that they need to be color balanced. Do not confuse color balance with color temperature. If you look on the label of fluorescents, you will see two numbers: Color Temperature and CRI (color rendering index). It is essential that you understand the difference. Color temperature refers to the temperature of the total wavelength of the tube but does not describe the recipe of the spectrum elements that generate that temperature. The CRI relates to how close is the tube’s balance of spectrum elements when compared to sunlight. In other words, you can use many different mixes and come up with 5000K but what is essential is the spectrum mix be as close to sunlight as possible. The minimum CRI for any sort of color accuracy is 90. The gold standard was the T12 Chroma 50’s. Today, the current standard size tube is the T8 that have only recently become available in high CRI tubes. Color balanced CFL’s are available through photographic equipment suppliers and color balanced circular fluorescents are also available. To understand the importance of these lighting elements, I can suggest no better source than chapter 1 in the book, “Color Management,” by Bruce Fraser, Chris Murphy, and Fred Bunting.

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