When you consider lighting it is also necessary to pay attention to
the color temperature expressed in Kelvin units and CRI or the
efficiency of the light. I cover this fairly comprehensively in my
book but briefly: Different light sources have different temperatures
and therefore are of different colors and affect the look of the item
being viewed. Hologen light bulbs come in temperatures between 3200
and 4800k. Noon white daylight is approximately 6,000 kelvin. So,
3200 is quite yellow and 4800 begins to approach balanced daylight.
In my office I have created a balanced white daylight grading
enviorment because I sell all sorts of colored gems and although
different gems put their best foot forward in different sorts of
light, on average, they look better in white light. Flourescent
lights do come in balanced white daylight betwee 5500-6500 kelvin.
Unfortunately to much reliance on this type of lighting will make a
jewelry store look like the inside of a fishmarket. So, in our new
gallery we mix both types of light with the objective of getting as
close to balanced daylight as possible.
For Information and sample chapters from my new book: