Halogen lamp can be used both for its intended purpose and for various other purposes. For example, for: heating food, starting a fire, warming frozen locks, checking the air for oxygen (attach a hose to the side tube, and if there's no oxygen in the air being drawn, the flame will be smaller, while if there is a combustible gas, the flame will increase.Operating principleThe lamp works on gas; by bringing the hose close to the suspected leaks, one can observe the change in flame color.In case of leaks, the color changes from yellow-purple to greenish.