FIELD: testing engineering. ^ SUBSTANCE: device comprises working chamber made of thin-walled quartz pipe. The faces of the pipe are provided with collectors for supplying and sucking oxidizing gas agent of a given composition. The quartz lamps are interposed between the working chamber and reflector in the air-cooled space. The reflector is detachable along its axis and provided with jet ring air sprayer and has passages for discharging air in the mid part of the reflector. ^ EFFECT: simplified structure. ^ 1 dwg