Seoul has 25 areas of City Hall, the ward office has been operating theater at least 1 in maximum 4-5 locations to various sized places. The purpose of theater has been used for a variety of purposes to typical performances of Drama and Musicals, School play, Lecture. This points to a Variety of ideas for use, when replacing an exsting halogen luminaires, appropriate LED luminaires, Learn more if there is any advantage in terms of the energy saving part. it will be applied to the value for the energy saving to ward office hall of the actual targets. In case replacement in existing halogen luminaires to LED luminaires, to energy savings of about 80% appear around. Get the advantages of the various functional properties a device chip of the LED itself, Forward will be referred to as easy to replace the halogen luminaires and LED luminaires.