Re: Solux Bulb color temperature
Re: Solux Bulb color temperature
- Subject: Re: Solux Bulb color temperature
- From: Beisch Clemens <email@hidden>
- Date: Tue, 17 Feb 2009 15:57:17 +0100
Hello Ken,
if you are putting all the kelvins into a xY graph, you'll get a
curve from blue to amber (dirty yellow).
Every color in the directions to greenish and purple will end up with
the same kelvin measurements as the one on the curve.
That's why Kelvin is not a good choice for this kind of work.
The CIE defined D50, D65 and so on exactly.
You can have a bulb that delivers exactly 5000K but also a heavy
green or magenta cast.
The humans eyes are much more sensible to a color cast in magenta or
green than to a difference in blue and yellow.
So I think, that a difference between 4700K and 5000K dosn't be a big
problem.
Regards,
Clemens Beisch
Am 17.02.2009 um 15:41 schrieb Fleisher, Ken:
On 2/17/09 9:33 AM, "Andrew Rodney" <email@hidden>
wrote:
Because D50 is an exact color where Kelvin is a range of colors (many
colors correlate to the same kelvin value). I think as well that you
would want the 4700K bulbs.
I was also told, the newer "5000K" bulbs are for those who refuse to
accept anything not labelled as such.
I'm not sure I would agree with that assessment. If I could get
closer to
5000K, why wouldn't I want to? Based on the paper by D. Pascale and R.
Breton noted in a previous post, the 5000K bulbs do quite well in
conforming
to the P1 condition for proofing. The 4700K bulb did not perform as
well
overall (though still excellent result), even when in overdrive to
get the
CCT closer to 5000K. The results can only degrade if run at normal
wattage
at 4700K (assuming that you actually get 4700K and not 4450K as we are
getting). In this regard, I can't see how the 4700K bulb might be
preferred
over the 5000K bulb for this purpose. (Except maybe if it is not
bright
enough in your configuration...)
--
Ken Fleisher
Photographer
Imaging & Visual Services
National Gallery of Art
Washington, D.C.
Phone: (202) 712-7471
email@hidden
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