When you walk from outside, which is illuminated by sunlight, to inside, which is illuminated by “tungsten” illumination, your perception of colors remains fairly constant. But under some illuminations, such as street lights called “sodium – vapor” lights that sometimes illuminates highways or parking lots, colors do seem to change. Why do you think color consistency would hold under some illuminations, but not others?

Tungsten is a thin wire, this is what has been a part of the traditional light bulb design since its initial invention by the man himself Thomas Jefferson. Electricity will run a current through, which will then glow brightly, these are artificial lights that can be found in our ceiling fixtures, and common lamps. By producing more heat, we will be encountering a warmer light, one with a reddish source. Street lights, range from very white lights to ones that produce a color rendition that is more yellow- orange in color when it glows. When we discuss why would color consistency hold up under some illuminations and not others. Some bulbs burn warmer than others, this could affect how we see color consistency. Those lights that produce a white color tend to have better color rendition that is, colors, objects and shapes will continue to be their true color. Yellow lights tend to obscure illumination; even producing the color to become different, this color tends to lean towards the gray scale. The image that comes to mind is one where we are driving in a car at night, at some point while driving we notice that the lights illuminating our view are not crisp, like that of a flash. Dimly lit streets can morph roads together especially for those who suffer from vision impairments. Light source plays an effect, surfaces may reflect light differently depending on the source which provides the illumination. Affects like that of changes from nearby surfaces are considered to be a reflected light change. Our surroundings and the conditions that are a part of the surroundings. Our visual system then ends up compensating; meaning scene illumination changes when our light source is changed by physical processes. It is important to take into consideration that the color constancy condition matters when proposing if the changes in stimulation are given to the natural or artificial nature of the illumination source.