... and T4 tubes are available 3 Optional color temperature: 2,700, 4,100 and so Key Specifications/Special Features:Features: ... energy-saving and longer lifespan Flicker-free starting operation Ideal replacement of incandescent lamp T2, T3 and T4 tubes are availableSpecifications: ... hours Optional base: E27 and B22 Optional color temperature: 2,700, 4,100 or 6,500KApplications: shopping malls, table lamps, ...