Ordinary glass cannot be used as a bulb shell for an iodine tungsten lamp. The iodine tungsten lamp is a kind of illumination lamp that uses the principle of halogen-tungsten circulation to fill iodine into the bulb to control the sublimation of the tungsten wire. It has the characteristics of high brightness and long life. It is often used as the light source of cinematography stage factory building square.

Iodine tungsten lamp has ignition capacity. An iodine tungsten lamp is a kind of tungsten filament lamp filled with iodine vapor for a chemical reaction. It is often used in indoor and outdoor lighting places with high illumination requirements and high installation points. This kind of lamp has a high degree of thermal light source, and there is a risk of burning combustibles on the outer wall of the lamp tube in a short time. Therefore, it is of great significance to understand the ignition ability of iodine tungsten lamp to combustibles for fire prevention and fire investigation.

Iodine tungsten lamp is not allowed to be used on the construction site. Iodine tungsten lamp is an improved version of incandescent lamps. Its principle is similar to that of incandescent lamp. A chemical combination reaction occurs at the lamp wall, and the sublimated tungsten on the lamp wall and other parts of the lamp tube is recycled to the filament and sublimated at a relatively high temperature (above 1200-2000℃) so that the filament will not burn out quickly due to high temperature.

The standard molar enthalpy change for the reaction of tungsten diiodide (WI₂) is -70.61 kJ/mol. it is defined as the thermodynamic energy change between the reactants (i.e., W and I₂) required for the formation of 1 mol of WI₂ and its corresponding reaction product (i.e., the WI₂ gas) under the standard condition. Specifically, the enthalpy of formation of the reaction of tungsten diiodide can be determined by determining the standard molar enthalpy of formation of tungsten, iodine, and tungsten diiodide, a value that can be obtained by experimental measurement.