This study categorizes the types of activities carried out in office space in order to attain a pleasant lighting environment and aims to extract an adequate lighting environment for each activity utilizing general and focused lighting methods.
The ex...
This study categorizes the types of activities carried out in office space in order to attain a pleasant lighting environment and aims to extract an adequate lighting environment for each activity utilizing general and focused lighting methods.
The experiment was carried out by constructing a full-size mock-up similar to a typical office space, and used LED surface light sources for the ceiling and working surface lighting that allows the modification of light color and intensity.
Experiment Ⅰ used 48 different lighting intensities for 3 activity types (non-work, general work and precision work) with 18 participants measured through a subjective 7-scale survey.
As a result of the experiment, for non-work activities, color temperature of 4,700K~5,200K with 450~500㏓ light intensity proved to be optimal. Also, for general work, color temperature of 4,700K~5,600K with 750~800㏓ light intensity, and for precision work, 5,200K~5,600K with 850~1,000㏓ was extracted as optimal setting.
If a ceiling light(general lighting) that was able to adjust light intensity and color temperature was used, the results of this study can be applied for applicable work type.
In experiment II the optimal lighting for LED light's focused/general interchangeable lighting in office space was extracted. General and precision work types were experimented where a work surface lighting creates the lighting environment. A total of 25 lighting environments per activity was tested and used the results from experiment I for ceiling lighting. As like in experimentⅠ, a subjective 7-scale was used to measure the results and there were a total of 20 participants.
As a results to experiment Ⅱ, in case of general work, ceiling lights from 4,700K and 470㏓ with work surface lights with 5,600K and 770㏓ to 4,700K with 630㏓ and working surface of 5,200K with 770㏓ was extracted.
During precision work, ceiling lighting at 4,700K with 470㏓ and work surface lighting of 5,200K with 980㏓ was extracted as optimal.
The preference towards ceiling light was concentrated on 4,700K with 470㏓ for both general and precision work.
The results of this experiment suggest that in a non-work activity, a general lighting of 4,700K with 470㏓ intensity through a ceiling light should be used and for general or precision work, focused lighting (work surface lighting) should be used along with general lighting. And the results extracted can be used as a standard to set the color temperature and light intensity.
From the above research results, a work environment built considering the intensity, color temperature and lighting type, a more pleasant and efficient work environment can be set up compared to the conventional fluorescent lighting. The results can also be a guide to setting up lighting in the office space using LED. Also, by utilizing high-efficiency LED light sources and focused/general range lighting together, an efficient lighting environment can be set up to save energy and tackle some of the environmental issues at hand.