Explosion proof lamps are generally classified according to the selected light source, explosion-proof structure and use. According to the light source, there are explosion-proof incandescent lamp, explosion-proof high-pressure mercury lamp, explosion-proof low-voltage fluorescent lamp, hybrid light source lamp, etc; Explosion proof lamps, increased safety lamps, composite lamps, etc. are classified according to the type of explosion-proof structure; Explosion proof lamp and portable explosion-proof lamp.

Light source selection of explosion-proof lamp. Although incandescent lamps are still widely used, they are gradually replaced by other light sources due to their low luminous efficiency and short life. Among them, single plug, leadless fluorescent lamp, self ballasted high-pressure mercury lamp and high-pressure sodium lamp are widely used.

The single plug non start fluorescent lamp is a cold cathode gas discharge lamp. The principle of irradiation is to use the discharge between electrodes to generate ultraviolet radiation from mercury atoms, so as to stimulate the luminescence of fluorescent materials on the inner wall of the lamp. The fluorescent lamp has high luminous efficiency (about 3 times of the incandescent lamp) and long service life. The starter is not required for starting (usually there is a conductive layer on the wall of the lamp, called the sliding layer, and the radiation brightness of the fluorescent lamp); When the bulb breaks, the flash layer is also damaged, and the bulb goes out). The cathode temperature is low (about 200 ° C). This is a safe and practical light source, which is very suitable for making increased safety lighting fixtures.

Self ballasted high-pressure mercury lamp is a hybrid light source, which emits light by using high-pressure mercury vapor discharge and three kinds of incandescent and fluorescent materials. The utility model has the advantages of high brightness, simple structure and fast starting speed. It changes the disadvantage of the high-pressure mercury lamp which needs to add ballast before. The use of tungsten wire plays a current limiting function, and also improves the color of light. The disadvantage is that the service life is shorter than that of ordinary fluorescent high-pressure mercury lamp. High pressure sodium lamp is a high pressure sodium vapor discharge lamp, which has the advantages of high luminous efficiency, low power consumption, strong atomization ability and long service life.

Single plug, non start fluorescent lamp and self ballasted flow high-pressure mercury lamp are mainly used in the production unit of the author's unit. The original fixed explosion-proof incandescent lamp has been replaced by the original lamp with self ballasted flowing high-pressure mercury bulb under the condition of meeting the minimum distance between the bulb and the specified transparent cover plate. Although the high-pressure sodium lamp has a certain energy-saving effect, due to its poor color rendering, we generally do not use it in production equipment, but only for road lighting. Sometimes, in order to improve the straight white of the high-pressure mercury lamp, some high-pressure sodium lamps can also be included in the production unit. For high intensity lighting places requiring good color rendering (such as on-site inspection of large equipment), explosion-proof floodlights can be used. The light source is generally a metal halide lamp with a rated power of more than 1000W.