Commonly used LED fluorescent lamp specifications are T8, T5, T4 lamp, a group of three tubes for the enterprise is usually T5 lamp, LED fluorescent lamp long before the specifications T10, T12. "T" stands for "Tube" which means tubular, and the number after T stands for lamp diameter. T8 is the 8 "T", a "T" is 1/8 inch. One inch equals 25.4 millimeters. Then every "T" is 25.4 ÷ 8 = 3.175mm T12 lamp diameter is (12/8) × 25.4 = 38.1 mm T10 lamp diameter is (10/8) × 25.4 = 31.8mm T8 tube diameter is (8/8) × 25.4 = 25.4mm [T8 is exactly one inch diameter tube] (Note: uniform width 39mm, height 52mm) Commonly used fluorescent lamp length and power: (20w long 620mm; 30w long 926mm; 40w long 1230mm) T5 lamp diameter is (5/8) × 25.4 = 16 mm (Note: the uniform width of 23.5mm, height 39mm) Commonly used fluorescent lamp length and power: (8w length 310mm; 14w length 570mm; 21w length 870.5mm; 28w length 1170.5mm; 35w length 1475mm) T4 tube diameter is (4/8) × 25.4 = 12.7 mm (Note: the uniform width of 21mm, height 32mm) Commonly used fluorescent lamp length and power: (8w long 341mm; 12w long 443mm; 16w long 487mm; 20w long 534mm; 22w long 734mm; 24w long 874mm; 26w long 1025mm; 28w long 1172mm) The diameter of T3.5 lamp is (3.5 / 8) × 25.4 = 11.1 mm T2 tube diameter is (2/8) × 25.4 = 6.4 mm Led fluorescent tube is manufactured according to the ordinary fluorescent lamp specifications, its specifications are as big as the same, you can easily replace the ordinary fluorescent lamp LED fluorescent lamp to achieve environmental protection and energy saving, which will help save the cost of replacement. Rotor Magne,Specialized Levo Rotor Magnet,Rotor As Magnet,Magnetic Rotor Ningbo YinZhou Haochang Magetic co,LTD , https://www.haoche-magnet.com