What are halogen bulbs? Experts call them an improved generation of incandescent lamps. The main similarity is that the light source in them, as in incandescent lamps, is a heat-resistant tungsten spiral. Led Bulbs is located in a flask filled with an inert or buffer gas. When an electric current passes, the spiral is heated, producing heat and light energy. The spiral of a halogen lamp heats up to a higher temperature, so it emits more light. For more information on the types of plinths and options for using halogen, see the video.