A process for producing an \u03b1-hydroxyketone compound, which comprises subjecting an aldehyde compound to a coupling reaction in the presence of an alkoxyimidazolidine compound represented by the formula wherein R1. In this way, a driver box housing the driver can be spaced from the light panel to communicate with pre-existing facilities and can serve the additional advantage of keeping the driver box out of standing water that may accumulate on the structure. A sensor transfers information concerning operational states of the fluid control system to the local control means. The method may include creating, via the user interface device, a risk self-assessment questionnaire for soliciting information about a business process subject to risk. Thereby, the lights emitted from the light source 4 different in brightness, due to the diffusion during progressing in the light diffusion film 20, at the process of entering the transparent substrate 2, becomes even in brightness, and is suspended in the generation of the stripe pattern of light and shade, as a result a spread and even illumination can be realized.