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1. An elongated tube glass light source, comprising: an elongated glass tube, wherein the elongated glass tube has an light emission area; a light emitting unit; a reflecting element, wherein the light emitting unit and the reflecting element are located within the elongated glass tube, and the reflecting element comprises a reflecting layer, wherein light emitted from the light emitting unit and reaching the reflecting layer of the reflecting element is reflected and emitted from the light emission area of the elongated glass tube; and a substrate which is bent and placed in the elongated glass tube to form a light source cavity and a heat dissipation cavity, wherein the light source cavity is enclosed within a substantially V-shaped region, wherein the light source cavity and the heat dissipation cavity are filled with an inert gas or a mixture of an inert gas and oxygen, wherein the light emitting unit and the reflecting element are located in the light source cavity, and the reflecting element comprises a mirror base and the reflecting layer is a silver-plated layer which is formed on the mirror base, and then the mirror base is thermally pressed on the substrate to form an integral structure which is bent along with the substrate to define the light source cavity for allowing the reflecting element to reflect the light from the light emitting unit, wherein the inert gas or the mixture of the inert gas and oxygen filled in the light source cavity and the heat dissipation cavity is able to prevent the silver-plated layer from sulfidation and blackening, wherein the substrate is bent to form a mounting portion and a wall attaching portion connected to the mounting portion, wherein the mounting portion of the substrate is formed with one or more thermal convection holes, which respectively communicate the light source cavity with the heat dissipation cavity to facilitate the heat convection between the light source cavity and the heat dissipation cavity.
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