Abstract
In a ceiling light for houses, I developed the lighting equipment which I added a-like light function to automatically which let I was automatic, and the fluorescent light output change to keep the brightness that I used a brightness sensor and set for a change of neighboring brightness. The interior of the general house is various, and wide dynamic range is necessary for brightness detection by color of the carpet or having table or not so that reflectance is different greatly. In other words adaptability for various room environment becomes the problem. Therefore I adopted a load resistance reshuffling circuit and planned precision improvement of the brightness detection for wide reflectance.
