Abstract: The invention relates to an electric lamp (100) whose light source reaches a very high temperature during operation. It mainly relates to a lamp provided with a double envelope such that a fracture or a crack of the outer envelope (2) does not prevent the lamp (100) from functioning. The lamp is therefore provided with a safety cut-out wire (5) which allows the opening of the conduction path of the lamp in case of a fracture. To this end a safety-switch portion (6) is inserted in the safety cut-out wire (5). This portion is made of a material which opens the conduction path as soon as the safety-switch portion (6) comes into contact with air.