The level and group of the selected explosion -proof light should not be lower than the explosive mixture level and group levels in the explosive dangerous environment. At the same time, the impact of the environment on explosion -proof lights should be considered, and the requirements of different environments such as environmental temperature, air humidity, corrosion or pollution substances should be met. Select the protection level and anti -corrosion level of lamps according to different environmental requirements. Especially when there is a corrosive gas in the explosive gas environment, it is critical to choose lamps with corresponding anticorrosive properties. The regional level and scope of the explosive gas environment. If the explosion -proof lamps must be used in the area 1 area, the fixing lamps in the 2 area can be exploded and increased, and the movement lamps must be exploded.