... traditional appearance design, there are ventilation hole in lamp adapter cylinder surface.2.Small tube size, high efficiency, ... .Installation convenience7.Protect eyesight8.Heat resisting and Fire prevention adapter. Specification:2 feet - 8W,9W, replace t8 20W3 ... phosphor light source, color show index Ra>85, 4. four different adapter structure can moistureproof, dustproof and better for circuit ...