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Lumens, watts, Kelvin. Warm light, fugitive light. A crowd of about 100 learned about all of it and more.

Fred lawrence whippleJohn grahamePam westonJoannah hinksGreen valley council planningCanoa hills centerArchitecture committeeDarksky international southern arizona chapterCornell universityPima countyGreen valley councilDan iceGreen valleyFred lawrence whipple observatoryMount hopkinsSanta rita