| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a lighting design method with which lighting can be designed with proper evaluation of brightness feeling of a space such as a habitable room of a house, by using a new index in which the orientation of light emitted from a lighting fixture arranged in the space is reflected and which is obtained by a simple method obtained by improving a conventional evaluation method in which the brightness feeling is evaluated with illuminance on a horizontal surface. <P>SOLUTION: In the lighting design method, a virtual hexahedron 11 is provided on a predetermined representative position of a space for which the lighting is designed, and for example, it is disposed at the center portion of a habitable room 10. Under the designed light environment, the illuminance values E<SB POS="POST">V1</SB>, E<SB POS="POST">V2</SB>, E<SB POS="POST">V3</SB>, E<SB POS="POST">V4</SB>, and E<SB POS="POST">H</SB>of the five surfaces other than the bottom surface of the virtual hexahedron 11 are measured or calculated, respectively, and a ratio of vertical to horizontal illuminance (RVH) is obtained by dividing the average luminance value E<SB POS="POST">V0</SB>=E<SB POS="POST">V1</SB>+E<SB POS="POST">V2</SB>+E<SB POS="POST">V3</SB>+E<SB POS="POST">V4</SB>)/4 of four side surfaces by the luminance value E<SB POS="POST">H</SB>of the upper surface. The lighting of the space (habitable room) 10 is designed by evaluating the brightness feeling using the ratio of vertical to horizontal illuminance (RVH) as index for brightness feeling. <P>COPYRIGHT: (C)2012,JPO&INPIT |
