a combination of a variety of fluorescent substances and a mixing ratio and a concentration thereof 1 5 parts of nkp 8306 fluophor produced by nippon keiko kagakusha were dispersed as fluorescent substance in akylbet md mitsubishi rayon co ltd which is an acrylic resin and a fluorescent color cap having a thickness of 0 5 mm was molded using a mold and a heat press when this color cap was mounted on a blue led which emits a light defined by x 0 1490 y 0 1203 in the chromaticity coordinate systems a result similar to that of the example 1 was obtained in this example the measurement was carried out through the integrating sphere 1 5 parts of nkp 8306 fluophor produced by nippon keiko kagakusha were dispersed as fluorescent substance in mitsubishi polyethy hd hj390 mitsubishi chemical co ltd which is a high density polystyrene and a fluorescent color cap having a thickness of 0 5 mm was molded using a mold and a heat press when this color cap was mounted on a blue led which emits a light defined by x 0 1490 y 0 1203 in the chromaticity coordinate systems a result similar to that of the example 1 was obtained in this example the measurement was carried out through the integrating sphere 1 5 parts of nkp 8306 fluophor produced by nippon keiko kagakusha were dispersed as fluorescent substance in cepton 2043 kuraray co ltd which is a styrene thermoplastic elastomer and a fluorescent color cap having a thickness of 0 5 mm was molded using a mold and a heat press when this color cap was mounted on a blue led which emits a.