RichardE Loc: California

Much info on this subject all over the internet.
1) Red backlight behind the computer bouncing off wall.
2) Or white backlight, etc.
3) fLux app to keep the color temp at 6500K (I am trying this out)
4) Indirect light somewhere in the room at 5000K
5) Window light at 90 deg from computer monitor
6) Overhead light and wear a baseball cap

Then again, if a set Kelvin, what lumens?

What are your opinions?

John_F Loc: Minneapolis, MN

Am I correct in assuming the problem is the extent to which the ambient lighting affects what you perceive on the computer monitor? It is fairly obvious that reflected ambient light mixes with the monitor emitted light, so that the closer the ambient light spectrum matches natural light the less the monitor colors might be modified. Color management is one of the most complicated subjects in the computer field. This is not the place to delve into the intricacies of the subject, but there is no dearth of written treatises on the subject. When fiddling with images in software one vital step is the erase color casts. To take oneself out of the process is to use a cookbook method in, fir example, Photoshop in the Curves adjustment eyedroppers. This is fully explained in most Kelby books. But the core requirement is the subject must have something that was real white and something else real black. If not, now you have to go with your gut and room ambient light raises its ugly head.

Morning Star Loc: West coast, North of the 49th N.

Are you asking how many lumens at a certain Kelvin temperature?
Or am I reading that wrong?
Lumens is the amount of light, degrees Kelvin the colour of light.

RichardE Loc: California

That is my question. What number of lumens do you typically use with 5000K or 6500K? There are several options I see.

Morning Star Loc: West coast, North of the 49th N.

OK, now I understand: you want to know how many lumens to use with a certain Kelvin temperature, not convert from one to the other.

this is concerning headlights on card, but may give some insight anyway:
http://headlightretrofits.com/bulbs-info/hid-kelvin-color/

From this website I get the impression that tempK and lumens are tied together: as the number of one goes up, the number of the other goes down.
http://www.audizine.com/forum/showthread.php/352911-HID-info-kelvin-%28color-temp%29-vs-lumen-%28brightness-output%29

I may be completely out on a limb with this, but I used to have a bedside lamp with a 25 watt bulb. The light coming from it, looked very yellow to me. In another room I had a floorlamp with a 150 watt bulb. Same brandname, same type of bulb, just different wattage. But the light from that bulb seemed a whole lot whiter.
That seems to match the above: as the lumens (wattage) goes up (25-150) the temperature in Kelving goes down: Yellow 2700K - white 4000 K. It does make me wonder if you can keep the same tempK and increase or decrease the lumens.
I'm really interested now. Undoubtedly there are some folks on the Hog who know the definite answer, and I will be keeping an eye out for their responses!

BTW, I have my desktop computer, where I do most of my photo editing, in a west-facing bedroom. The walls are painted a pale-medium gray of the "eggshell" kind: somewhere between glossy and mat. There is no light from outside that can shine directly on the monitor. In the daytime I never have the light on in that room, in the evening I use an Ott Lite, positioned behind and above the monitor. And of course the monitor is calibrated. When I send out photos to be printed I always tell the lab "no colour correction, please" and I'm more than happy with the prints I get back.

RichardE Loc: California

quote"When I send out photos to be printed I always tell the lab "no colour correction, please" and I'm more than happy with the prints I get back."

I do the same. I have a south facing room window and blinds closed in the AM. 60 watt bulb behind me, No reflections. I was thinking of using a 60 watt equiv LWD at 5000K to shine on the wall / blinds behind the iMAC at night.

Waiting for other UHG'ers to chime in...

rpavich Loc: West Virginia

I sit at the dining room table with several sources of mixed lighting on.

In other words, I don't do much about it.

I have seen folks use monitor shields to keep out stray light or glare.

Yooper 2 Loc: Ironwood, MI

I work under Natural Daylight bulbs. Only minimal tweaking is needed to Hard Proof for printing compared to fluorescent or incandescent bulbs.

buckbrush Loc: Texas then Southwest Oregon

RichardE, Hope this will help you.
I've just been changing my over head kitchen lights from incandescent to LEDs and I found that I could buy similar bulbs having the same lumens (like wattage) but having different Kelvin ratings.
Therefore I had to try different bulbs until my wife got the 'brightness' she liked. 3300 K was too 'warm or yellow' and 6500 K was too 'bright or white' for her to like it.
We settled on 4500 K as a happy medium. Still too white for me as I liked the warmth feeling of the light given off by incandescent bulbs.

JD750 Loc: SoCal

I think you are mixing up brightness (intensity) with color (frequency).

You like a warmer color than she, but have wisely ceded to your wife's preference over your own.

JD750 Loc: SoCal

For what purpose?

RichardE Loc: California

I just want to go easy on my old eyes and I have an opportunity to set up a room for me to work in other than the Dining room table!