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Dr Chan, A while back you answered a question and stated: "Infrared radiation is invisible to humans and is only detected in the form of heat. As far as I know, unlike UV radiation, IR is only rarely harmful to the eyes. Prolonged exposure over many years can accelerate cataract formation (mostly with people who work with hot materials such as molten glass or steel). However, IR has a short range. To be sure, if you get close enough to the source with your eyes, you would feel the heat which would cause you to close your eyes or move away long before it can cause any harm. If you suffer from dry eyes, the heater may exacerbate this condition." If IR has a short range how can it heat objects 20 feet away from the tube? My mechanic has an AMBIRAD IR system in his garage and it's amazing. The whole garage heats up within 5 minutes. However, I am concerned about eye damage. I am opening a hot yoga studio. I was thinking about placing an AMBIRAD radiant IR system on the ceiling (I have 13 foot tall ceilings). It's affordable, heats up quickly and is efficient. I was told IR can be harmful. I don't want to risk damaging anyone's heath, but can I feel safe with an AMBIRAD IR system in my hot yoga studio? I have equal concerns about forced air due to allergens and other pollutants it blows around, but let me know what you think
Hi. I'm Dr. Rick and I have two decades of ophthalmology experience. I'm online and happy to answer your question today.
Will you switch to Q&A mode?
A couple follow up questions.
If the IR only has a short range of penetration into tissue how is it that it heats up a human body so well?
Also, a normal hot yoga studio is heated to over 100 degrees F.
How does an infrared heater measure the temperature? For example, a forced air system measures the air temperature to make sure it's 100 degrees. An infrared heater passes through the air until it hits objects and the objects absorb radiation. How can I tell when I've heated my room to the proper temp?