... watt to a 49w lamp tube , gives 36.7 watt to a 35w lamp tube , give 27.5 watt to a 28w ... lamp tube , give 22.3 watt to a 28w ... 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 ...