Re: Color temp of viewing lamps
Re: Color temp of viewing lamps
- Subject: Re: Color temp of viewing lamps
- From: Roger Breton <email@hidden>
- Date: Tue, 17 Feb 2004 23:31:56 -0500
>
I used to use a color temperature meter, but under any kind of
>
fluorescent lamps it gave variable results.
Care to specify which make?
>
I have been doing some work with GTI, and we observed something very
>
interesting: using their variable intensity light source, the Eye-One
>
shows that color temperature declines from 4850 K at full brightness to
>
about 4400 K at low brightness.
I hope to have some time soon to send in my old EyeOnePro to upgrade to to
EyeOneBeamer capabilities. But in the mean time, I have to rely on a pair of
Minolta ChromaMeters CL-100 and my SpectroCam, and to some extent a
MonacoOptix XR which will read ambient light. I use a GTI D5000 Soft-View
dimmable booth. At full intensity, the booth creates a light having 2470 Lux
with chromaticies of 0.342 and 0.379 or 5182K. At half intensity, I get .342
and .377 or 5179K. At 25% intensity, I get 288 Lux .342 and .373 or 5170K.
At minimum intensity I get 128 Lux .343 and .373 or 5136K. These readings
don't agree with what you describe below?
>
Our eyes (a group of very experienced eyes) told us the opposite - it
>
got bluer is it became less bright. GTI's color temperature meter
>
confirmed this.
I did not know GTI had it's own color temperature meter? Where can I find
out more about it?
>
What does this mean? At this point, I don't believe the Eye-One is a
>
valid color temperature measuring device.
I'll let you know when I get my EyeOneBeamer. But in emissive mode, the
accuracy if the i1 is quite good, IMO.
>
Mark Rice
>
Zero One
>
www.zero1inc.com email@hidden
Regards,
Roger Breton | Laval, Canada | email@hidden
http://pages.infinit.net/graxx
_______________________________________________
colorsync-users mailing list | email@hidden
Help/Unsubscribe/Archives:
http://www.lists.apple.com/mailman/listinfo/colorsync-users
Do not post admin requests to the list. They will be ignored.