Fluorescent lamp, high intensity discharge lamp and incandescent lamp with improved luminous efficiency

摘要

The present invention improves the luminous efficiency of lamps that emit light due to electric discharge, such as a fluorescent lamp and an HID lamp, or incandescent lamps. The fluorescent lamp includes a glass tube used as a fluorescent tube made of a glass material containing an emissive element. When exposed to ultraviolet light (with the peak wavelength of 251nm) emitted due to mercury excitation, the emissive element emits ultraviolet light having a longer wavelength than that. The HID lamp includes an envelop made of a glass material that contains an emissive element. When exposed to ultraviolet light emitted due to excitation of an emissive material enclosed in an arc tube, the emissive element emits ultraviolet light having a longer wavelength than that. The incandescent lamp includes a tube being made of a base material which contains an emissive element. The emissive element emits visible light when exposed to ultraviolet light, in addition to the light emitted by the filament.