E27 to E40 base adaptor 1.lamp holder parts 40*58mm 2.E27 to E40 adaptor 3.E27 to E14 adaptor 4.E27 to ... E27 adaptor E27 to E40 ... lighting3.Speciality stores, hotel, bar, cafe, jewelers4.Indoor lighting, villa, high-quality hotel, meeting room5.School library, museum, exhibition hall, hospital ...