| | E21 | E24 | E17 | BT28 | BT37 | BT46 | BT56 | | Nominal Diameter | 2.756 in 70 mm | 2.953 in 75 mm | 2.165 in 55 mm | 3.543 in. 90 mm | 4.567 in. 116 mm | 5.906 in. 150 mm | 7.087 in. 180 mm | Maximum Overall Length | 6.142 in 156 mm | 6.969, 7.283 in 177, 185 mm | 5.118, 5.433, 5.748 in. 130, 138, 146 mm | 8.307, 8.701 in. 211, 221 mm | 11.457 in. 291 mm | 14.606 in. 371 mm | 15.394 in. 391 mm | Light Center Length | - | | 3.150, 3.504, 3.740 in. 80, 89, 95 mm | 5, 5.512, 5.039 in. 127, 140, 128 mm | 7.283 in. 185 mm | - | 9.488 in. 241 mm | | |
|