The relationship between the temporary loss in contrast sensitivity and the ratio of luminances of successive visual fields. While color preference for environmental surroundings is obviously subjective, green and blue seem to be preferred over red, and all three over yellow. The saturation of a color is an important point for lighting. Although some people appear to prefer deeper, saturated colors, lighter colors are most often used on walls and large surfaces because they reflect more light. That difference may be quite noticeable in the overall room light level.
Natural lighting poses some problems in office environments.
Direct sunlight may be over 100,000 lux. If an office area is large and there is light from outdoors, considerable interior lighting may be required to maintain reasonable light balance throughout the room. Glare also may be a problem with higher intensities of natural light. Owing to the brightness range of natural illumination, it is usually best to position the display so that the screen is perpendicular to the plane of windows. This not only helps keep windows out of the field of view, but reduces the probability of bright light from windows being reflected into the user's eye.