Northern (indirect) light is wonderful, it has a neutral blue leaning quality that allows a relatively constant and even lighting for long periods of time. Natural sunlight has a color rendering index or CRI of 100 and Kelvin of around 5500. These numbers are important to the artist for only one reason, accurate artificial lighting.
I have found consistent indirect light hard to come by. My problem lies in that my home has too much lighting from the east and west and none from the south or north. This lighting is neither consistent, nor indirect due to my homes positioning to the suns travel throughout the day. To counteract this I rely on painting once the sun has set or is setting, and the use of artificial lighting.
When searching for lighting attempt to find bulbs that have a CRI and Kelvin as close to natural light as possible. Don’t fall into the trap of getting expensive “art” lighting and bulbs. Much cheaper bulbs and setups can be easily found with a little reading (or online).
Once set up they will seem much too blue, especially if you were using incandescents in the room previous to setting up the new lighting. This is normal as most normal bulbs have a yellow cast to them. Allow time for your eyes to adjust (or do this in the day with the room naturally lit to minimize the perception shift).
If possible set you lighting up to minimize reflections but maximize an even coverage on your painting area (especially on your palette!) and your setup. It’s really important to get you palette lit correctly as this is where all your mixing takes place, if you’re off here you’re painting will be off as well.

The photograph above is quite lacking, I hadn’t retouched the painting yet so it was impossible to get the lighting not to wash out some areas, the peels shadow suffers the most from this phenomena. The colors to the left are more accurate. Also, to be perfectly honest this is actually a Clementine not an orange, but orange is a much more accessible word for a search so… orange it is.
