T8 Bulbs are more energy-efficient and have a smaller diameter (1 inch) than T12 Bulbs, which are less efficient with a larger diameter (1.5 inches).
JESLED Super Bright 130lm/w T8 LED Tube Light 8W-72W Hot Selling T8 T10 T12 LED Replacement for Fluorescent Bulbs Power8w-72w Size60cm/90cm/120cm/150cm/180cm/240cm CRI(Ra)80 Lumens130lm/W CCT3000k/4000k/5000k/6000k/6500k