LNG, chemical plants, paint houses, polished polishing workshops, car wheel polishing workshops, coal washing plants, garbage power plants, gas stations, gas stations, coal washing plants, ammonia reservoirs, food factories, firecrackers warehouses, explosivers cannons House, sandblast room, steel plant, gas station, paint depot, oil depot, clothing factory library, chemical warehouse, fuel bank, firework workshop, flour mixing room, metal polishing workshop, magnesium powder polishing workshop, aluminum powder polishing workshop, tobacco, tobacco, tobacco, tobacco, tobacco, tobacco, tobacco, tobacco, tobacco Warehouses, paper plants, dyes, pharmaceutical plants, heat power plants, metallurgical plants, coal mine tunnels, coal stacking areas, and other places, as well as environmental places with many flammable and air environmental dust, are very dangerous, so they need to use it. Explosion-proof lights.