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<p>[QUOTE=&quot;benveniste, post: 1991543, member: 25547&quot;]5500K is generally considered daylight, although in reality &quot;daylight&quot; varies from 3000K at sunrise or sunset up to perhaps 10000K in heavy overcast.&nbsp; The once typical household 60W incandescent bulb, on the other hand, puts out light in the 2700-2800K range.</p><p><br /></p><p>One concern with CFL bulbs is that the light output is often concentrated in a few frequencies, whereas sunlight or an incandescent bulb puts out light at all frequencies.&nbsp; You can see the difference in a spectral power distribution chart such as those shown by GE <a href="http://www.gelighting.com/na/business_lighting/spectral_power_distribution_curves/" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://www.gelighting.com/na/business_lighting/spectral_power_distribution_curves/" rel="nofollow">here</a>.&nbsp; Using standard &quot;supermarket&quot; CFL&#039;s can result in a green cast, especially on red copper or gold.</p><p><br /></p><p>It is possible to buy &quot;high CRI&quot; compact flourescents which minimize the &quot;spiky&quot; nature of the light output.&nbsp; They are sold for purposes of photography, aquarium lighting and plant growth among others.&nbsp; I use a brand called &quot;Indoor Sunshine&quot; which claims a CRI of 95 -- I&#039;ve had no problems photographing gold with them.</p><p><br /></p><p>Standard incandescent lights will also work perfectly well, so long as you use appropriate settings on your digital camera and your setup allows you to cope with the heat they generate.&nbsp; For those few of us still occasionally using film, it&#039;s a bit more of a challenge, but even then one can use color correction films as needed.[/QUOTE]</p><p><br /></p>

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