Previously, we studied how materials behave under light. In essence, the two qualities of a surface, in the illumination study are:
Reflection: O how light is reflected.
Reflectance: O how much light is reflected.
Well, the color is a quality that affects the reflectance of a material. Dark colors, such as blue or red, reflect less light, while bright colors like yellow or turquoise, reflect much light. We can see the following example:
The picture shows three spheres of different color, from left to right, red, yellow and blue. Next, let's take a measurement, in false color map of the luminance emitted by each sphere. The luminance is a measurement unit in cd/m2, which represents the brightness of an object .
As we can see, the yellow sphere reflects a lot of light (in this particular case, almost 30,000 cd/m2) while the red sphere reflects much less. Finally we can see that the blue sphere reflects very little light.
Consequently, we can say that color is decisive in reflectance. To realize this statement, we represent a graph where we see how much light is able to emit every tone, as a percentage:
Later, we will study the effect of color radiation, decisive on the use of the architecture.
Until next time.
 CIE: International lighting vocabulary. Commission Internationale de l’Eclairage, 2011.