... , bulb, candle, globe, lotus etc. TubeWatts (W)Lamp baseLumens (lm)MEASUREMENTS (mm)L1L2D1D2tube diameterT4 spiral20WE271151149±4 7449591223WE271370158± ... 474495912Advantage of Delta Energy Saving lamp:1.) Certificate:CE.ROHS2.) High luminous efficiency,no ... 60Hz, 8000 hrs, tri-phosphor powder, iron base E27, no EMC and ROHS, 6400K 10,000 pcs ...