To facilitate better understanding process of birth of the report on "Research and Survey Committee for Residential Illuminations for Achieving Energy Saving and Comfort", which is the basis of this special edition, and the residential illuminations related to this special edition, this article describes the objectives of the report, qualities and quantities of residence illuminations, and energy saving.
Based on actual data about the quantities of lamp shipments and average luminous efficiency of lamps, we analyzed annual power consumption for each type of lamps, such as incandescent or florescent lamps, and estimated expected energy savings achieved by replacing these lamps to those of higher efficiency. We also predicted the possibility of energy saving that can be achieved by LED illuminations, which are now steadily growing its number, assuming future performance improvements and replacements for conventional light sources.
We conducted the internet survey to get a grasp of the reality of illumination usage in residences, so that we can use the information as a database upon considering how we can reduce the power consumed in illuminations in a living room. We conducted the survey on types of luminaires used in a living room, a private room (including a bed room and a children's room), the number of luminaires used, types of their light sources, and conditions for using the luminaires in the living room during the weekdays and holidays, and their behaviors. This article reports on the result of the survey.
Based on the questionnaire survey, the reduction of the electric consumption for lighting in living rooms was calculated. The electric consumption was reduced by replacement of lamps (from incandescent to fluorescent lamps) and by cutting the surplus light to required illuminance and area illuminated for each task. The effect of the multi lighting systems on reducing electric consumption was also shown.
We developed some illumination usage scenarios using various types of light sources including an LED, and conducted an experiment to subjectively evaluate usage of illuminations suitable for various living activities in living and dining spaces. This article makes a report on the summary of the experiment.
Based on the subjective experiment for a living room described in the previous manuscript, relation among subjective impression of suitableness of lighting, characteristics of luminance image, and characteristics of brightness image, is examined. Finally a lighting design method to realize comfortable and energy saving lighting is proposed from the examination.
In a series of our residential-illumination-related researches for achieving energy saving and comfort, we created an illumination plan for a living area and a dining area using the distributed multiple-lamp arrangement. We at first assumed seven living activities, such as watching TV, and proposed five types of luminaire lighting patterns suitable for these activities. We also introduced some current misunderstandings about the distributed multiple-lamp arrangement, and make some discussions about the distributed multiple-lamp arrangement of the future.