... lamp tube , give 22.3 watt to a 28w lamp tube 7) Voltage optional: 110v ,120v, 220v ,230v , 240v , 277v, and 347v 8 ... tube.15) Environmental friendlier. Solid mercury, 38% less glass compared to T8. 16) Improved light quality , no stroboscopic flickering, which usually ... causes headache and irritated eyes. T8 to T5 adapter energy saving light fit every kind of T8 ...