There's a huge difference between shining a few 30mA IR diodes in your face versus working all day in front of an open furnace.
But seriously: She has 22 IR LEDs. Let's say 50mW each and you have over 1W of illumination in there. If you wore it while outside/at work, it could easily add up to 10 hours a day, 6 days a week. That's really not "nothing", even though the immediate intensity is not comparable to furnace, the overall dosage very well might be...