Re: 5000° K Full Spectrum Lighting
Re: 5000° K Full Spectrum Lighting
- Subject: Re: 5000° K Full Spectrum Lighting
- From: "dpascale" <email@hidden>
- Date: Tue, 26 Feb 2008 17:33:24 -0500
Richard,
Do you intend to illuminate the area around your monitors with 5000 K light?
If yes, are your monitors also at D50? (or somewhere between D50 and D60)
Do you intend to compare your prints against your monitor? If not, then buy
these low cost tubes and keep the ambient level low (100 lux recommended).
If yes, read what follows.
The required illumination for correct viewing assessment, 500 lux+, is too
high to be used as ambient (even your 390 lux is way too high for many).
Thus, you need a separate, somewhat confined, viewing booth. You will also
need to adjust your booth light output so that the luminance of the viewed
print matches your monitor luminance (typically 100 to 160 cd/m2).
If you compare your prints under a 5000K lamp near your monitor, your
monitor better be at 5000K also. If your monitor is "far away" from your
viewing booth, a D65 calibrated monitor will be OK.
If you critically compare printed material with printed proofs, without a
need to compare the prints against a nearby monitors, then a room full of
fluorescents at 5000 K, with much more than 500 lux, is the way to go (2000
lux is recommended, which is quite bright !).
You better use less of the more expensive fluorescents and place them at
select locations where they do not interfere with the monitors (a booth, or
a low hanging fixture is preferable to a ceiling fixture). And keep all the
other lights off (the window shades also if applicable). The indirect
illumination from the booth areas should be enough to work comfortably. If
not, individual desk lamps should be used when required.
And, finally, to add to what Andrew mentioned, fluorescents are fluorescents
(!), even the best ones are not perfect, imagine the second tier...
Danny Pascale
email@hidden
----- Original Message -----
From: "Richard Frederickson" <email@hidden>
To: <email@hidden>
Sent: Tuesday, February 26, 2008 4:14 PM
Subject: 5000° K Full Spectrum Lighting
My manager and I have had an ongoing discussion for some time now
regarding whether or not 5000° K lighting is justifiable in our
illustration/photography workstation areas. We do some prepress work and I
have a GTI viewer at our scanning workstation. Most of our material is
printed in-house (e.g., scientific posters) and our color is important,
but not critical.
The folks at GTI quoted me a price of $23 a lamp, which my boss absolutely
will not go for. I've seen a number of "Full Spectrum" lamps on the market
that are the same color temperature for as little as $6 a tube, and I'm
thinking that something is better than nothing. Am I right in this line of
thinking and how prevalent is full spectrum lighting in the real world?
Also--beyond color fidelity issues--are there any additional benefits
documented about working in this lighting environment?
The corollary question is how bright should the working environment be? I
took few quick measurements around the office with my eye-one found a
value of 74 Lux at the monitor is about 390 Lux at the keyboard and quite
comfortable to work in.
Many thanks for your thoughts,
Richard
--
Richard Frederickson (Contractor)
Scientific Publications, Graphics & Media (SPGM)
Advanced Technology Program, SAIC-Frederick, Inc.
National Cancer Institute at Frederick
Post Office Box B
Frederick, MD 21702
Phone: (301) 846-1546
FAX: (301) 846-6563
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