Flame proof light is the most important and typical type of explosion proof lighting, we also call Ex d light, which means all electrical parts of the light are put inside a high strength flame proof enclosure, when explosion occurs inside the enclosure, the flame proof enclosure can withstand the exploding pressure without any damage and transmit the exploding energy through designed flame proof path to a negligible scope to outside of the enclosure to eliminate the formation of the explosion outside the enclosure.