Re: Proofing light recommended CRI ?
Re: Proofing light recommended CRI ?
- Subject: Re: Proofing light recommended CRI ?
- From: Roger Breton <email@hidden>
- Date: Mon, 10 May 2004 08:27:58 -0400
>
What's most important is a full spectrum. The SPD or spectral power
>
distribution curve shows how much energy is emitted at each wavelength. A
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curve that closely matches daylight with no dips, drop outs or peaks is far
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more important than the color temperature or even the CRI which is a
>
subjective measurement. The RHEM indicator is a device that can reveal a
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deficiency in the SPD, but it's by no means the end all proof of good
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illumination.
>
>
john c.
I suspect there's more than full spectrum involved. I have rigged Solux
lamps left and right and they have full spectrum. Although they say they
have a CRI of almost 100, I'm still not convinced to go large scale with
them in my own and my client's proofing environments. Short of having a
spectroradiometer to physically measure the spectral power distribution
curve of all these lamp, I find CIE chromaticities to be the best substitute
for making an informed judgement about how close is a lamp to meeting
ISO-3664 requirements for graphic arts. The RHEM indicator is another tool
to confort us in our judgement but is not the panacea, I agree.
Roger Breton | Laval, Canada | email@hidden
http://pages.infinit.net/graxx
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