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Hazardous location environments carry a high risk of explosion due to the presence of flammable and explosive substances which can range from combustible gas to fine airborne, particulate matter.
In January 2016 NASA put out a call for engineers to design an impossible light fixture that produced zero heat. This was because excess heat on a space ship is always a potential catastrophe.
Did you know that incandescent lightbulbs can reach 100 degrees Celsius or more? They can heat paper to temperatures beyond 200 degrees, if placed carelessly. The filament temperature can become exponentially hotter than that, with temperatures in excess of 1000 degrees Celsius. No wonder they cause fires.