Analysis of light adaptation and dark adaptation of lighting design

Introduction: from the design point of view of the design, from the perspective of the construction of lighting, which may be a lot of teachers choose the angle. What if we're going to talk about it? What will the angle can make us filled with wisdom?

Hu Guojian is the teacher of the course on another way, the lighting design from the perspective of visual perception of his research, the light can be visual acceptance, the final form of our emotions with the unique angle tricky, as a unique martial arts kung fu but mysterious master.

"In the strict sense, we do not design illuminance, but the brightness of different elevations in each space. "

When we discuss the lighting solution, to comfort perception measure about very much, but this is only know the surface of it, and to know why, the visual perception research course you must not miss. Too much knowledge hidden secrets, perhaps you will suddenly see the light, suddenly. The last time we talked about the formulation of illumination standard values is based on visual perception utility, so this time we see between those different illuminance values, which will constitute a relationship for the lighting design, which is why the design of "ethics" exist? Let's look at the relationship between adaptation and adaptation:

Adaptive and dark adaptation

When the people for a long time in a bright environment suddenly entered the dark, the original can not see anything, after a certain period of time, the visual acuity was increased gradually, gradually see in the dark objects, this phenomenon is called dark adaptation (dark adaptation).

On the contrary, when the people for a long time in the dark and suddenly into the bright place, first felt a dazzling light, can not see the object, only wait a moment to restore vision, this is called light adaptation (light adaptation).

Figure: we can clearly see from the above, from the light into the dark adaptation time is long, from dark to light adaptation time is short (red box). These feelings can also be found in our daily experience.

In theory, dark adaptation is the process of increasing the sensitivity of the human eye to the light in the dark. Is the first in the dark for about 7 minutes, the human perception of light threshold a marked decline again after more obvious decline; into the dark about 25-30 minutes, the threshold dropped to the lowest point, and stable in this state.

According to the analysis, the first stage of the dark adaptation is mainly related to the synthesis of the visual pigment of the cones, and the second stage is the main stage of dark adaptation.

The process of adaptation is rapid, usually in a few seconds to complete. The mechanism is that the rod cells accumulate a large amount of rhodopsin in the dark and break down into the bright place to meet the strong light. Only after more rapid decomposition of the pigment of the rod, the less sensitive cone pigment can be restored to the light.