Re: Proofing light recommended CRI ?
Re: Proofing light recommended CRI ?
- Subject: Re: Proofing light recommended CRI ?
- From: "jc castronovo" <email@hidden>
- Date: Sun, 9 May 2004 22:42:18 -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
curve that closely matches daylight with no dips, drop outs or peaks is far
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
deficiency in the SPD, but it's by no means the end all proof of good
illumination.
john c.
----- Original Message -----
From: "Roger Breton" <email@hidden>
To: <email@hidden>; <email@hidden>
Sent: Sunday, May 09, 2004 7:49 PM
Subject: Re: Proofing light recommended CRI ?
>
> I don't have the actual lights in front of me to compare, only the
specs.
>
> But one is a 5000k CRI-91 tube and the other is a 5500k CRI-95 tube.
Seeing
>
> that they both offer a high CRI and a colour very close to natural
>
> daylight, I wonder if there would be a big difference between them?
>
>
>
> Obviously 'real daylight' would be ideal. But are there recommended
specs
>
> for proofing lights that set a target range such as "5000-5500k and CRI
of
>
> 90 or higher"?
>
>
>
> Reason I ask is that some lamps cost a LOT more for only a slightly
higher
>
> CRI. Would this make a difference in real world practice?
>
>
>
> Thanks for any insight.
>
>
>
> Russell Proulx
>
> Montreal
>
>
I've experimented at lengths with Ott lights, GTI lights, Gretagmacbeth
>
lights and Normlicht lights. The best one I've seen so far, and my
customers
>
agree with me, are the Normlicht ColorControl D50 fluorescents. You can
look
>
at them with a RHEM indicator for more assurance. But they're plenty
kosher
>
for my eyes. Thre's always Solux but you'll have to become somewhat of an
>
electrician to extract actual D50 chromaticities out of them.
>
>
Roger Breton | Laval, Canada | email@hidden
>
http://pages.infinit.net/graxx
>
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