Many industrial sectors such as oil, chemicals, coal and national defense often leak or spill a variety of flammable and explosive gases, liquids and various kinds of dusts and fibers in various processes of production, processing, transportation and storage . Mixtures of these substances with air can become explosive mixtures and can cause serious accidents such as explosions and fire in the event of an ignition source when the concentration of the mixture reaches the explosive concentration range. Therefore, the use of electrical equipment in such hazardous environments must use LED explosion-proof lamp products.