Product Description Specifications T5T8 glass tube, size and specification can be customized, glass wall thickness can be adjusted. It can meet the needs of T8T5 three-color lamp automatic production line, and can also meet the material needs of bulb production line, the materials are potassium barium and soda-lime lime, automatic cutting and closing, high precision, small tolerance, high glass transparency, high strength and toughness of glass tube; All data can be easily controlled. Each glass tube will have different light transmittance, and the glass tube coated with phosphor has the best light transmittance, which can reach more than 90. The light transmittance of the outer coating is about 90.