I have 5500 K fluorescent ceiling lights in my studio/office. I usually 
calibrate with them on, then work with them on. This makes it consistent, day 
or night. However, I have at times calibrated with all the lights off. That 
works fine as well, although I have to turn on the overhead lights to inspect 
the print. Consistency is the goal here.
Paul
On Feb 5, 2011, at 5:12 PM, Christine Nielsen wrote:

> ...If I may butt in with a related question... what about room
> lighting?  I'm trying to get my own system color-managed, but I've
> seen conflicting answers... for calibrating the monitor, should my
> room be illuminated "to a reasonable reading level", or "as dark as
> possible as long as you can still operate the controls on your
> monitor" (http://www.robertstech.com/blog/?p=64!) ..?
> 
> Then, once we're all calibrated & editing is underway, how should the
> room be lit?  The same way as for calibrating?  I'm guessing that the
> main goal would be consistency in the ambient light... and that it be
> consistently daylight-balanced?  What about daytime vs nighttime
> editing...?
> 
> Thanks...
> :)
> -c
> 
> On Fri, Feb 4, 2011 at 12:04 PM, Godfrey DiGiorgi <[email protected]> wrote:
>> On Fri, Feb 4, 2011 at 8:01 AM, David J Brooks <[email protected]> wrote:
>>> I finally got around to hooking up my Epson 2400. I needed to clean
>>> the heads so all are fine now.
>>> 
>>> I do not have my iMac calibrated but i wanted to see how it would
>>> print out and match the screen.
>>> 
>>> Test print is coming out darker than the screen by a fair amount using
>>> LR 3 to adjust and print. If i lower the brightness of the screen by
>>> 5-6 clicks i get on screen what the print looks like.
>>> 
>>> Is this a classic case of "get the dam monitor calibrated" or maybe a
>>> print setting. ??  I have checked those several times and cannot see
>>> any change it what i had been doing on the P C. No colour adjustment
>>> set, proper paper specs set etc.
>> 
>> Yes, it's a "get the darn monitor calibrated" moment. ;-)
>> 
>> 1- Set room illumination to a reasonable reading level.
>> 2- Calibrate and profile the display. *
>> 3- check the adjustments you've made on screen using the "Lights Out"
>> mode with a *white* fill. Once it looks right, you're ready to print.
>> 
>> * Note that in some circumstances and with some displays, it's hard to
>> get the brightness down to the right level. Particularly with today's
>> very bright, very contrasty LCD displays. If you do all this and the
>> prints are still a little dark, raise the room illumination so that
>> your eye when adjusting the images on screen sees them a little
>> darker.
>> 
>> My display calibration targets using the Eye One Display 2 colorimeter
>> and its software application are 120 luminance, 1.8 gamma and 5500K
>> white point. I find this works beautifully in my normal room
>> illumination with color managed output to the R2400. You can choose
>> other targets if you prefer, what's important is that you choose your
>> targets, calibrate and then have a working reference for your eyes
>> that does the right thing.
>> --
>> Godfrey
>>   godfreydigiorgi.posterous.com
>> 
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