THE ACTUAL USING OF ELECTRIC LIGHT AND DAYLIGHTING IN THE NON-LIVING SPACES : Survey on the actual condition of electric lighting and sunshade in the housing (Part 1)

The electric lights in the house are used in not only nighttime but also daytime. It is thought that power consumption with the electric lights can be reduced if brightness is secured by daylight sufficiently. Although some surveys on the electric lighting are conducted, the survey on the relation between the use of the electric light in the living act and the daylighting in the house is few. We conducted the survey on the actual condition of electric lighting and daylighting in the non-living spaces of house with questionnaire. As a result, the use of the electric light in daytime was related to the amount of the introduction of the daylight. When enough daylight is not obtained, a lot of people light not only the localized lighting but also the general lighting.