... same wattage.1,Energy conservation: save 45% electricity compared to T8 lamps.2,Environmental friendly: use solid-stated mercury, easy to ... 38% less usage of glass and phosphor powder compared to T8 lamps.3,Higher color rendering index: 10% improvement in reproducing ... .4,Eye protecting: T5 lamps twinkle 45,000/second when T8 is 120/second, alleviate eye fatigue. Ordering AbbreviatioinDiameter (mm) ...