On October 27th, Toshiba Lighting & Technology of Japan released the concept of the company's self-developed bright concept "Weluna". In the light perceived by the human eye, the light that directly illuminates the eye from the light source is removed, and the illuminance of the outer portion is numerically represented by Weluna in units of lux (lx).
Toshiba Lighting Technology's survey results show that the higher the value of Weluna, the stronger the "lightness of space". According to the company, since the brightness feeling can be quantitatively expressed by the Weluna concept, it is possible to propose an illumination space scheme that combines comfort and energy saving without damaging the space impression.
Weluna concept (information: Toshiba Lighting Technology Co., Ltd.)
For example, in the office, the work surface illumination is set to 500 lux, and the Weluna value that people do not feel dark is verified. As a result, it is found that if there is approximately 60 lux, an appropriate brightness can be obtained (Toshiba Lighting Technology's investigation result. Verification in multiple offices using LED base lighting. It varies slightly due to space, floor and wall materials).
Toshiba Lighting Technology Co., Ltd. Chairman of the Toshiba Lighting Technology Co., Ltd. said: "The calculation program is simple and can be converted into the unit used in the previous lighting design. It should be easy to understand. We hope to use it as a new indicator."
Toshiba Lighting Technologies has deferred Weluna using software developed in the project of lighting design. At the lighting scene, an image of a 180-degree field of view is taken using a digital camera equipped with a fisheye lens, and the value of Weluna is obtained from the image.