Adam Wilt goes full on into the numbers of color meters and color temperature.
I bought the Lighting Passport for some product development work I’m doing, along with the well-used (and well out of calibration) Minolta Color Meter II. The two Sekonics I borrowed from Art Adams: his own, recently-calibrated C-500, and a C-700 prototype on loan from Sekonic.
The Minolta Color Meter II and the Sekonic C-500 are “traditional” color meters; they use separate R, G, and B sensors to measure the relative intensities of those three colors, and they compute a “correlated color temperature” (CCT; see below) from those readings. They also report the green/magenta balance of the light, a.k.a. the “tint”.
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