led tubes, T8, T5, T4 lamp tubes led and LED tube lamp specifications, the length and powert5, t10, t12, t4, t8, led ,tubes, lamps, lights, buolbs, fluorescent, length, sizes, wattage, high power, reviews: commonly used T8, T5, T4 lamp, as well as T10, T12. Well, this “T” on behalf of “Tube”, indicates this thing is tubular, T behind the numbers indicate the diameter of the tube. Each “T” is 1/8 inch, one inch equals 25.4 mm. Then every “T” is 25.4 ¡Â 8 = 3.175mm, then the T8 tube diameter is 25.4mm.The following lamp parameters collected property to facilitate the majority of designers to understand and use. Specifications Diameter: Commonly used T8, T5, T4 lamp, as well as T10, T12. Well, this “T” on behalf of “Tube”, indicates this thing is tubular, T behind the numbers indicate the diameter of the tube. Each “T” is 1/8 inch, one inch equals 25.4 mm. Then every “T” is 25.4 ¡Â 8 = 3.175mm, then the T8 tube diameter is 25.4mm. T12 tube diameter is (12/8) ¡Á 25.4 = 38.1 mm T10 tube diameter is (10/8) ¡Á 25.4 = 31.8mm T8 tube diameter is (8/8) ¡Á 25.4 = 25.4mm (T8 is just one-inch diameter tube) T5 tube diameter is (5/8) ¡Á 25.4 = 16 mm T4 tube diameter is (4/8) ¡Á 25.4 = 12.7 mm other tube diameter size and so on: T3.5 diameter of 11.1 mm, T2 diameter 6.4 mm Length and power: Length T8 lamp (Note: Unified width 39mm, height 52mm) 20w long 620mm; 30w long 926mm; 40w long 1230mm; Length T5 lamp (Note: Unified width of 23.5mm, height 39mm) 8w long 310mm; 14w long 570mm; 21w long 870.5mm; 28w long 1170.5mm; 35w long 1475mm; Length T4 lamp (Note: Unified width 21mm, height 32mm) 8w long 341mm; 12w long 443mm; 16w long 487mm; 20w long 534mm; 22w long 734mm; 24w long 874mm; 26w long 1025mm; 28w long 1172mm; T5 and T4, T8 so what difference does it make?Theoretically, the finer the higher the efficiency of the led tube lights t5 t8 lamp, that is to say, the more the same wattage light. To save costs, T5, T4 are used in the form of micro-holder to sell the ballast is contained in the micro-space inside the stent, efficiency and quality of such ballast are generally not good, should lead to a high efficiency lamp but not as good as conventional T8 tube light, life has also a little discount. Nevertheless, the actual use, thin tube easily concealed, using the occasion also flexible, which is why T5, T4 fluorescent tubes give designers use most of the reasons for it.Common household led tube lights lamp and the general characteristics of the family used: 20W length 64cm 640mm 30W length 96cm 960mm 40W 128cm 1280mm length Color Temperature Color is the absolute temperature K to represent.Different color temperature will cause people in different emotional responses.