Abstract: A light control system includes a daylighting unit that takes in outside light, a lighting unit that is able to adjust an output of light, an acquisition unit that acquires brightness information representing brightness, including at least brightness of the outside light taken in from the daylighting unit, and a control unit that controls the output of light toward a target value. The control unit changes the target value based on the brightness information.

Abstract: In a memory of a lighting device, correspondence relations among an initial output, a target output and time required for reducing brightness from the initial output to the target output are stored in advance. When the initial output and the target output are designated (YES at S1), the time necessary for brightness reduction is specified from the correspondence relation (S3), and the light emission output is reduced at such a change rate that the light emission output has a linear relation with respect to elapsed time from the initial output to the target output in a specified time, on a semi logarithmic graph in which the ordinate is a logarithmic axis representing light emission output and the abscissa is a linear axis representing time (S5).

Abstract: In a memory of a lighting device, correspondence relations among an initial output, a target output and time required for reducing brightness from the initial output to the target output are stored in advance. When the initial output and the target output are designated, the time necessary for brightness reduction is specified from the correspondence relation, and the light emission output is reduced at such a change rate that the light emission output has a linear relation with respect to elapsed time from the initial output to the target output in a specified time, on a semi logarithmic graph in which the ordinate is a logarithmic axis representing light emission output and the abscissa is a linear axis representing time.

Abstract: This invention relates to a herbicidal foam composition comprising, on the basis of the total weight of the composition, (a) a herbicide selected from the group consisting of Bialaphos, Glufosinate, Glyphosate and a mixture thereof, (b) an anionic and/or nonionic surfactant(s), (c) a solvent, (d) a foam controlling agent selected from the group consisting of silicone oil, a C.sub.1 -C.sub.10 alcohol and a mixture thereof, (e) water as a diluent and (f) liquefied petroleum gas as a propellant, the pH of said composition being adjusted to within about 3-11.