Re: Regarding 6500K light source
Re: Regarding 6500K light source
- Subject: Re: Regarding 6500K light source
- From: DScharf <email@hidden>
- Date: Fri, 01 Feb 2002 15:48:48 -0800
- Organization: David Scharf Photography
Thermionic light sources DO emit a continuous spectrum, but not
flourescent or discharge sources. The usual problem with thermionic, of
course, is that the color temperature does not start out high enough to
filter down to D50.
Here's a good reference page on the subject:
http://www.highend.com/news/colortemp.html
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DAVID SCHARF PHOTOGRAPHY
Scanning Electron Microscopy
Los Angeles, CA 90039
http://www.microscopy-today.com/Scharf.html
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You could filter sunlight to D50, because the sun emits a fairly
continuous spectrum, but manmade light
sources don't -- they emit
spiky wavelengths, so there isn't much to
filter.
The best we can do is to make light sources
that produce tristimulus
values equal to those of the D50 reference
illuminant, or more
strictly to a correlated color temperature of
5000K.
B
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email@hidden