A headlight with simple and reliable structure and a lamp cap comprises a solid lamp cap (121), current supply conductors (102 and 103) that are fixedly sealed in the lamp cap along the part of the circumference of the lamp cap, the first ends (104 and 105) of the current supply conductors (102 and 103) are provided with connecting points (108 and 109) and a central line (113) of the second ends which are perpendicular to the lamp cap (121) extends and are perpendicular to each other. A lamp tube (130) is provided with two current conducting conductors (131 and 132) which are arranged axially and oppositely and at least extends along the central line (113) of the lamp cap (121) roughly. The head light can include a tilt lamp cap (117) that is connected with the lamp cap (121) seamlessly. The wall of the tilt lamp cap is provided with the current supply conductor (103). |