Abstract
The tea-ceremony room has generally many windows, though the room itself is very small. The depth of tea-ceremony room is in many cases 1.5 or 2ken (2.7 or 3.6 meters). So to give the necessary illumination through out the room, there need not be so many windows. The fact that they have many windows, is therefore showing the tea-masters' unique design, very carefully considering the lighting effect in each space of the room, on the figure of guests or on the several tools used by the master etc. We had first selected 50 samples and studied on the standard condition of their light environment. Next about the 17 rooms, we had actually measured the distribution of illumination. Both results may be useful as the materials to study the lighting condition of tea-ceremony room.
