... efficiency; 2.OEM to major manufacturers in EU; 3.Single/Three target coating available; 4. Thicker glass tube. CIB Solar ... loss by conduction and convection.Each production process of vacuum tubes is under strict control, the spectrophotometer has ensured the ... temperature, pressure, and duration time to control the lifetime of vacuum.Vacuum tubes are produced with lengths (mm) of 1500, 1600, 1800, ...