RE: ISO-3664:2009 illumination
RE: ISO-3664:2009 illumination
- Subject: RE: ISO-3664:2009 illumination
- From: Roger Breton via colorsync-users <email@hidden>
- Date: Sun, 16 Jun 2019 08:20:26 -0400
Thank you, Refik!
I knew this information was "somewhere"...
So the new code is the letter "E" -- sounds like Sesame Street, "Today, we'll
learn the letter "E", as in "Elephant", ha! ha! ha! Sorry, I could not resist 😉
I could not find the spectral power distribution data, you said was on the page?
Thanks / Roger
-----Original Message-----
From: Refik Telhan <email@hidden>
Sent: Sunday, June 16, 2019 6:03 AM
To: ''colorsync-users?lists.apple.com' List' <email@hidden>
Cc: email@hidden
Subject: Re: ISO-3664:2009 illumination
Hi Roger,
The lamp code indicates that it is an old one. Below is the link to the GTI web
page explaining the differences between the old and the new lamps:
https://www.gtilite.com/2011/01/whats-new-in-the-iso-3664-standard/
Below image from that page shows the new lamp codes should end with an E,
instead of an X.
https://www.dropbox.com/s/6euebxuxph0uelc/GTI_Lamp_Codes.jpg?dl=0
The same page also contains the spectral power distributions of the old and the
new lamps.
New generation Just Normlicht lamps are clearly marked.
https://www.dropbox.com/s/77eyu0wbcd9i6ux/JUST-daylight-5000-proGraphic-ISO.jpg?dl=0
Best,
Refik Telhan
Light and Color Management Consultancy
On 15.06.2019 22:27, "colorsync-users on behalf of Roger Breton via
colorsync-users" <colorsync-users-bounces+rtelhan=email@hidden on
behalf of email@hidden> wrote:
I suspect this "old" GTI lamp was manufactured a long time ago.
https://1drv.ms/u/s!AkD78CVR1NBqkLRy3q1Y_l3gK8VkWg
I gather there is a code that identifies lamps that meet the new
specification.
Does anyone know what code I should be looking for?
One thing, though.
I found this lamp installed in an old GretagMacbeth overhead luminaires, at
a client, yesterday.
See the data here, in Excel (measured with Minolta FD-7) :
https://1drv.ms/x/s!AkD78CVR1NBqkLRz_XP0GZyvIEZh7w
The thing is, according to ISO-3664:2009, the light produced by these lamps
"shall" (or "should") have energy in the UV part of the spectrum. I'm not
sure they specify down to 360nm but that's typically where the optical
brighteners components in the paper are excited from, according to my humble
information. If the lamp does not produce any energy in that part of the
spectrum, hence, the appearance of the proof "will be compromised". (I hope
TC130 is starting to work on the new type of LED illumination which will
gradually replace Mercury-based fluorescent tubes, because it's going to
happen sooner than later.).
Just curious, for those who have long measured the "new" 2009 lamps, would
you have some kind of data to share? So that I can compare? GTI lights,
preferably.
Thank you / Roger Breton
www.graxx.
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