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Message:: [QUOTE="Vess1, post: 484610, member: 13650"]If you want the true color of the coin under any lighting, just set your custom white balance under the lighting you're using and then the color temp won't matter.   In the aquarium hobby, it's known that a 6000k bulb is like a midday sun, or yellow in color.  10,000k is white.  20,000k is blue and 14,000k is in the middle.   If you used 20,000 k over a coin, it will make it look blue, for example.  If you set your custom white balance under that 20,000k, it tells the camera that this is real white under this light, the camera will adjust and you can take a picture under that light and still get the real color of the coin.      To do this, you select custom WB on your camera, put a white sheet of paper or something pure white under the full lighting.  Fill your camera's viewfinder with the paper and hit set, or ok.   Just remember that your camera is now set to that light until you switch back to auto or change the custom setting again.  If you try it, I think you'll like it.   I don't know what benefits color temps really have on a coin unless you're trying to make it look different from what it is.    I think I'm getting Numismatic Photography by Goodman for Christmas.  Maybe I'll be more educated then.[/QUOTE]