TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Composition: The white inorganic filler powder comprises titanium oxide, alumina, barium sulfate, magnesia, aluminum nitride, boron nitride, barium titanate, kaolin, talc, calcium carbonate, zinc oxide, silica, mica powder, granulated glass, powder nickel and/or powder aluminum, preferably anatase-type or rutile-type titanium oxide, alumina or barium sulfate. Preferred Process: The titanium oxide is surface-treated and covered with aluminum, alumina, zinc oxide, zirconium oxide and/or silica. The white inorganic filler powder and fluorescent substance are dispersed to flexible film-like reflection layer. Preferred Property: The white inorganic filler powder has average particle diameter of 0.05-50 mu m.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Composition: The raw-material composition further contains reaction inhibitor which deactivates or volatilizes by heating, and organic solvent and/or reactive diluent for viscosity adjustment.    TECHNOLOGY FOCUS - POLYMERS - Preferred Component: The flexible support is plastic film or metal thin film. Preferred Composition: The silicone rubber has non-cyclic dimethylsiloxy repeating unit. The plastic film contains polycarbonate resin, polyethylene terephthalate resin, polybutylene terephthalate resin, polyacrylonitrile resin, fluororesin, polyimide resin, polyphenylene sulfide resin, aramid resin, polyether ether resin, polyetherimide resin, liquid crystal polymer, polyether-sulfone resin, epoxy resin and/or cycloolefin resin. The content of cyclic low-molecular-weight polysiloxane in silicone rubber having 4-10 siloxy group-containing repeating units is 300 ppm. The flexible reflective base material contains silicone rubber (2-80 %mass). Preferred Process: The flexible film-like reflection layer and flexible support are adhered and attached using adhesive agent containing silicone rubber comprising silane coupling agent. The adhesion components are distributed in silicone rubber, and adhesion components are silane coupling agents. A gas barrier layer containing epoxy resin, polyimide resin, polyparaxylylene, urethane resin, acrylic resin and/or polyamide is formed between flexible film-like reflection layer and metal layer. Preferred Properties: The flexible film-like reflection layer has thickness of 1-2000 mu m, Shore A hardness of 10 or more, and Shore-D hardness of 50 or less. The silicone rubber has refractive index of 1.35-1.65.